Saliva suction device for intraoral radio frequency coil, combined intraoral suction device and magnetic resonance device

Abstract

The invention relates to a saliva aspiration device (30) for an intraoral radio frequency coil (41), a combined intraoral aspiration device (40) and a magnetic resonance device (10). The present invention relates to a saliva aspiration device (30) comprising a body (31) and an aspiration opening (32) configured to be connected to a vacuum system (50), where the body (31) is configured to provide a mechanical connection between the saliva aspiration device (30) and an intraoral radiofrequency coil (41), where the intraoral radiofrequency coil (41) is configured to receive magnetic resonance signals from a tooth region of a patient (15), and where the intraoral radiofrequency coil (41) is configured to receive magnetic resonance signals from the tooth region of the patient (15). The suction opening (32) is configured to remove saliva from the oral cavity of a patient (15) during a magnetic resonance measurement, the combined intraoral suction device comprising the saliva suction device (30) of the invention, and the magnetic resonance device comprising the saliva suction device (30).

Description

TECHNICAL FIELD

[0001] The present invention relates to a device for removing saliva from a patient's oral cavity during a magnetic resonance measurement. BACKGROUND

[0002] Recently, magnetic resonance imaging is gaining increasing interest in the application for imaging of teeth (e.g. imaging of teeth and surrounding dento-maxillofacial anatomy) as it enables radiation-free imaging and provides excellent soft tissue contrast, enabling differential diagnosis of tissue states and visualization of inflammation or irreversible tissue changes.

[0003] For magnetic resonance measurements of the dental region, the use of a dedicated receive coil is recommended, which can be arranged closely to the target anatomy, e.g. the patient's dentition or the jaw region, in order to improve the diagnostic image quality. The receive coil can be designed as an extra-oral coil (EOC) configured to be placed near the patient's outer facial surface or as an intra-oral coil (IOC) configured to be arranged inside the patient's mouth or oral cavity. While intra-oral coils can typically be arranged closer to the teeth, patients can react with increased nausea, gagging and / or swallowing urges to intra-oral coils. Due to the natural accumulation of saliva in the oral cavity, increased swallowing urges can also occur as a side effect of the magnetic resonance measurement, during which the patient is not allowed to move or swallow. Swallowing movements can have an adverse effect on the magnetic resonance images, as the acquisition of image data typically takes several minutes and any movement within the imaging volume leads to image artifacts, such as ghosting or blurring. Furthermore, swallowing movements can lead to suboptimal coverage of the relevant structures in the diagnostic sequence, e.g. if the patient swallows between the acquisition of scout images to the acquisition of a subsequent pulse sequence. SUMMARY

[0004] It is an object of the present invention to facilitate the workflow associated with the acquisition of magnetic resonance signals of a patient's dental region and to improve the quality of images based on magnetic resonance data received from the patient's dental region.

[0005] This object is achieved by a saliva suction device, a combined intra-oral suction device and a magnetic resonance device according to the present invention. Further advantageous embodiments are described in the respective dependent aspects.

[0006] The saliva suction device for an intra-oral radio frequency coil according to the present invention comprises a body and a suction opening configured to be connected to a vacuum system.

[0007] Preferably, the saliva suction device is configured to be used with an intra-oral radio frequency coil. In particular, the saliva suction device can be configured to be mechanically connected to an intra-oral radio frequency coil during a magnetic resonance measurement. According to the present invention, the saliva suction device is configured to remove saliva from a patient's oral cavity during a magnetic resonance measurement.

[0008] The body of the saliva suction device can define the external shape of the saliva suction device. Preferably, the body is shaped to allow at least a portion of the saliva suction device to be inserted into the patient's oral cavity. In particular, the body can be shaped to allow a portion of the saliva suction device, including one or more suction openings, to be inserted into the patient's oral cavity. It is conceivable that the body is shaped such that when the saliva suction device is properly positioned inside the patient's oral cavity, one or more suction openings are located between the inner surfaces of the teeth and cheeks and / or between the teeth and tongue.

[0009] The suction openings can be arranged on the surface of the body of the saliva suction device. Preferably, the saliva suction device includes a plurality of suction openings configured for fluid connection to a vacuum system. For example, one or more suction openings of the saliva suction device can be configured to be fluidly connected to a fluid conduit and / or a fluid chamber fluidly connected to the vacuum system. It is conceivable that each suction opening forms an aperture or channel in the wall of the body of the saliva suction device. The aperture or channel can be connected to one or more fluid chambers within the body of the saliva suction device and / or to a fluid conduit fluidly connected to the vacuum system.

[0010] A vacuum system may include a delivery unit, such as a pump or compressor, configured to provide a vacuum or negative pressure within a fluid conduit fluidly connected to one or more suction openings. According to embodiments, the delivery unit is fluidly connected to one or more suction openings via one or more fluid conduits, hoses, or fluid chambers. A saliva aspiration device may be configured to deliver saliva and / or other fluids located at one or more suction openings toward a vacuum system. In particular, a saliva aspiration device may be configured to remove saliva and / or other fluids from a patient's mouth.

[0011] According to the present invention, the body of the saliva suction device is configured to provide a mechanical connection between the saliva suction device and the intraoral radio frequency coil.

[0012] For example, a portion of the body of the saliva suction device can be shaped to mechanically engage with a portion of an intraoral radio frequency coil and provide a mechanical connection between the saliva suction device and the intraoral radio frequency coil. It is conceivable that the body of the saliva suction device is configured to attach to the intraoral radio frequency coil.

[0013] At least a portion of the body of the saliva aspiration device may correspond to the shape of an intraoral radio frequency coil. For example, at least a portion of the body may be shaped to conform to the shape of a portion of the intraoral radio frequency coil. Preferably, the body of the saliva aspiration device is shaped to accommodate at least a portion of the intraoral radio frequency coil. It is also conceivable that the body includes a retaining element configured to hold or maintain the intraoral radio frequency coil in a predetermined relative position with respect to the saliva aspiration device. According to an embodiment, the body of the saliva aspiration device is configured to attach to the intraoral radio frequency coil to prevent accidental movement of the intraoral radio frequency coil relative to the saliva aspiration device.

[0014] The intraoral radiofrequency coil is configured to receive magnetic resonance signals from the patient's dental region.

[0015] An intraoral radio frequency coil may include one or more antennas configured to receive magnetic resonance signals. The antennas can represent a connecting element between guided electromagnetic waves in a signal conductor and unguided electromagnetic waves, i.e., electromagnetic waves in free space. The one or more antennas of the intraoral radio frequency coil are preferably configured to receive electromagnetic waves within the frequency range of magnetic resonance measurements, particularly within the magnetic resonance frequency range of magnetically active atomic nuclei. For example, electromagnetic waves with frequencies between 1 MHz and 500 MHz, preferably between 10 MHz and 300 MHz, can be considered magnetic resonance signals. Magnetic resonance signals from ordinary atomic nuclei can have low power, ranging from a few microwatts to several milliwatts.

[0016] The intraoral radiofrequency coil may include at least one transmitting antenna configured to transmit high-frequency signals to the patient's dental region. Depending on the fundamental magnetic field of the magnetic resonance imaging device, the high-frequency signal transmitted by the at least one transmitting antenna may be in the power range of several watts to several kilowatts.

[0017] One or more antennas within an intraoral radio frequency coil may include or be composed of signal conductors. Signal conductors may include or be composed of conductive wires. The conductive wires of the signal conductor may have an elliptical or polygonal cross-section, suitable for permanently transmitting the power described above. It is also conceivable that the signal conductor is constructed as a conductive path on a printed circuit board. Such a signal conductor may have a generally rectangular cross-section. The signal conductor may be made of copper. However, the signal conductor may also include or be composed of other conductive metals, such as aluminum, platinum, gold, etc.

[0018] Preferably, one or more antennas of the intraoral radio frequency coil include protective elements configured to protect the patient from electric shock and / or burns. For example, the protective elements may be implemented as a coating and / or cladding covering the signal conductors and / or antennas of the intraoral radio frequency coil. The protective elements may include or be made of any suitable plastic, such as polytetrafluoroethylene (PTFE) or various polysiloxanes.

[0019] During a magnetic resonance measurement, an electric current can be induced in the signal conductor of the intraoral radiofrequency coil via nuclear magnetic resonance. This current can be detected as a magnetic resonance signal via a dedicated receiving unit or radiofrequency control unit of the MRI device. Conversely, the MRI device can be configured to supply alternating current to the signal conductor of the transmitting antenna of the intraoral radiofrequency coil to transmit a high-frequency signal, the so-called B1 magnetic field, into the patient's dental region.

[0020] It is conceivable that one or more antennas of the intraoral radio frequency coil are electrically connected to the radio frequency control unit of the magnetic resonance device via electrical signal connections. Such electrical signal connections may include electrical cables, particularly coaxial cables, which are shielded to avoid electromagnetic interference from the environment.

[0021] The intraoral radio frequency coil may include electronic circuitry electrically connected to one or more antennas. The electronic circuitry may include electronic components such as transistors, resistors, capacitors, diodes, conductor rails, or combinations thereof. In particular, the electronic circuitry may include protective circuitry configured to protect one or more antennas from electrical overload. Furthermore, the electronic circuitry may contain a high proportion of non-magnetic materials and corresponding standing wave barriers and / or baluns to avoid undesirable effects such as magnetic attraction, standing waves, heating, etc. In a preferred embodiment, the electronic circuitry includes a printed circuit board (PCB) or similar substrate suitable for accommodating the electronic components in predetermined positions relative to each other.

[0022] An intraoral radiofrequency coil may include a substantially flat or planar body configured to be disposed in the occlusal plane between the patient's upper and lower dental arches. However, it is also conceivable that the intraoral radiofrequency coil is shaped such that it surrounds a segment of the dental arch from at least two different sides. In a preferred embodiment, the shape of the intraoral radiofrequency coil, or one or more antennas of the intraoral radiofrequency coil, corresponds to or matches the shape of the patient's dental arch.

[0023] According to the present invention, the suction opening is configured to remove saliva from the patient's mouth during magnetic resonance measurement.

[0024] Preferably, the suction opening is configured to remove saliva from the patient's mouth during magnetic resonance measurement when the saliva suction device is attached to the intraoral radiofrequency coil and the intraoral radiofrequency coil is properly positioned in the patient's oral cavity.

[0025] As described above, the body of the saliva suction device can be shaped to allow at least a portion of the saliva suction device, including one or more suction openings, to be inserted into a patient's oral cavity. One or more suction openings can be fluidly connected to a vacuum system via channels and / or fluid conduits. Therefore, one or more openings can be configured to remove saliva and / or other fluids from the patient's oral cavity near one or more suction openings.

[0026] The saliva suction device of the present invention may include a plurality of suction openings regularly or irregularly distributed on the surface of the body of the saliva suction device. The body of the saliva suction device may form a fluid chamber that connects one or more suction openings to a vacuum system.

[0027] The saliva aspiration device of the present invention can refer to an accessory for use with an intraoral radio frequency coil. However, the saliva aspiration device can also be configured as a stand-alone device. For example, the saliva aspiration device can be configured to remove saliva from a patient's oral cavity without being attached to an intraoral radio frequency coil. In a preferred embodiment, the body of the saliva aspiration device is structurally stable or self-supporting. Therefore, even without the use of an intraoral radio frequency coil, the saliva aspiration device of the present invention can advantageously allow the removal of saliva from a patient's oral cavity.

[0028] The saliva aspiration device according to the invention advantageously allows for the removal of saliva during magnetic resonance imaging (MRI) measurements. Therefore, it is advantageous to reduce or avoid the patient's swallowing urges during MRI measurements.

[0029] When providing a saliva aspiration device that is fitted or attached to an intraoral radiofrequency coil, it is advantageous to avoid inserting multiple separate devices into the patient's mouth. Therefore, patient comfort can be improved and the risk of the patient terminating the MRI measurement can be advantageously reduced.

[0030] Furthermore, the saliva aspiration device of the present invention, attached to the intraoral radio frequency coil, advantageously prevents relative movement between the saliva aspiration device and the intraoral radio frequency coil. Therefore, it advantageously facilitates the correct positioning of the intraoral radio frequency coil and the saliva aspiration device for magnetic resonance imaging (MRI) measurements. In particular, the mechanical connection between the saliva aspiration device and the intraoral radio frequency coil ensures that one or more aspiration openings of the intraoral radio frequency coil and the saliva aspiration device are correctly positioned relative to the patient's dental arch.

[0031] According to an embodiment of the saliva suction device of the present invention, the body is configured to surround at least a portion of the intraoral radio frequency coil and / or provide a protective cover for at least a portion of the intraoral radio frequency coil.

[0032] It is conceivable that the body of the saliva aspiration device is configured to cover or enclose at least a portion of an intraoral radiofrequency coil to be placed within the patient's oral cavity. The body of the saliva aspiration device may include or be made of elastic and / or soft materials. A body made of elastic and / or soft materials may be configured to stretch over at least a portion of the intraoral radiofrequency coil and / or take the shape of at least a portion of the intraoral radiofrequency coil. Providing a saliva aspiration device including a body made of soft or elastic materials can advantageously reduce or avoid damage to sensitive tissues within the patient's oral cavity via the saliva aspiration device and / or the intraoral radiofrequency coil.

[0033] Preferably, at least a portion of the body configured to be disposed within a patient's oral cavity includes rounded edges to avoid causing injury to the patient. It is also conceivable that at least a portion of the body configured to be disposed within a patient's oral cavity includes or is composed of an electrical insulator. An electrical insulator can advantageously provide protection against electric shock or burns caused by direct contact between tissue and the antenna of the intraoral radio frequency coil.

[0034] The body of the saliva aspiration device can be configured to prevent direct contact between the intraoral radiofrequency coil and the patient's teeth. For example, when the saliva aspiration device and the intraoral radiofrequency coil are properly positioned in the patient's oral cavity for magnetic resonance measurement of the dental region, at least a portion of the body of the saliva aspiration device can be positioned between the teeth and the intraoral radiofrequency coil. Therefore, damage to the intraoral radiofrequency coil from the patient's teeth can be advantageously prevented, and the lifespan of the intraoral radiofrequency coil can be advantageously increased. Furthermore, it is advantageously unnecessary to place additional protective elements between the intraoral radiofrequency coil and the tissues within the patient's oral cavity.

[0035] A saliva suction device that covers or encloses at least a portion of an intraoral radiofrequency coil can advantageously serve as a barrier against dirt, bacteria, and / or bodily fluids. Therefore, it can facilitate or even eliminate the need for cleaning or disinfecting the intraoral radiofrequency coil after use.

[0036] In another embodiment of the saliva suction device according to the invention, the body is shaped to surround at least a portion of an intraoral radio frequency coil and to provide a shape-locking mechanical connection and / or force-locking mechanical connection with a portion of the intraoral radio frequency coil.

[0037] For example, the body of the saliva suction device may be configured to enclose or surround at least a portion of the intraoral radio frequency coil, thus providing a form-locking mechanical connection between the saliva suction device and the intraoral radio frequency coil. However, the body may also include retaining elements, protruding sections, and / or sections configured to surround, clamp, or otherwise mechanically engage with a portion of the intraoral radio frequency coil to provide a form-locking and / or force-locking mechanical connection between the saliva suction device and the intraoral radio frequency coil.

[0038] According to an embodiment, the portion of the body of the saliva suction device that accommodates and / or surrounds the intraoral radio frequency coil is slightly smaller than the portion of the intraoral radio frequency coil that is accommodated and / or surrounded by the body of the saliva suction device. Therefore, the portion of the body of the saliva suction device that accommodates and / or surrounds the intraoral radio frequency coil can be configured to provide a compression connection or clamping connection with the portion of the intraoral radio frequency coil accommodated and / or surrounded by the body of the saliva suction device.

[0039] Preferably, the body of the saliva suction device comprises or is made of a flexible or elastic material, the flexible or elastic material being configured to accommodate at least a portion of the intraoral radio frequency coil by stretching and holding at least a portion of the intraoral radio frequency coil in place via an elastic restoring force. Examples of suitable flexible or elastic materials are natural or synthetic elastomers or other elastic polymers or plastics that can be deformed by manual action.

[0040] A saliva aspiration device configured to provide a form-locking mechanical connection and / or force-locking mechanical connection with an intraoral radio frequency coil can advantageously facilitate the process of attaching the saliva aspiration device to the intraoral radio frequency coil. In particular, the saliva aspiration device of the present invention can be advantageously attached to an intraoral radio frequency coil without the need for special tools or other auxiliary components.

[0041] Furthermore, when providing a saliva suction device configured to accommodate and / or conform to an intraoral radiofrequency coil, it is advantageous to reduce the area or size of components that need to be inserted into the patient's mouth.

[0042] According to a preferred embodiment of the saliva suction device of the present invention, the body includes a receiving section shaped to complement a section of an intraoral radio frequency coil, such that a shape-locking mechanical connection is provided between the section of the intraoral radio frequency coil and the receiving section of the saliva suction device.

[0043] Preferably, the body of the saliva suction device comprises or is made of a flexible or elastic material according to the above embodiments. In particular, the size of the receiving section may be slightly smaller than the size of the section of the intraoral radio frequency coil to be housed within the receiving section of the saliva suction device.

[0044] For example, the receiving section may include a track or guide element that allows the section of the intraoral radio frequency coil to slide into the receiving section of the saliva suction device. However, the receiving section may also be configured as a bracket in the surface of the body of the saliva suction device, particularly a recess, indentation, or recess. Preferably, such a bracket in the surface of the body of the saliva suction device extends to the edge of the body of the saliva suction device. Therefore, the section of the intraoral radio frequency coil can slide from the side into the receiving section of the saliva suction device. Furthermore, the cable of the intraoral radio frequency coil can be led out from the body of the saliva suction device without an additional cable feed. However, the receiving section may also be configured such that the section of the intraoral radio frequency coil can be pushed into the receiving section from any direction.

[0045] According to the embodiment, the receiving section is shaped to complement the section of the intraoral radio frequency coil, so that a shape-locking mechanical connection between the section of the intraoral radio frequency coil and the receiving section of the saliva suction device is achieved by sliding and / or pushing movements.

[0046] The receiving section can be configured to accommodate the main surface of the intraoral radio frequency coil. However, the receiving section can also be configured to accommodate the sides and / or edges of the intraoral radio frequency coil. Preferably, the receiving section is shaped according to the portion of the intraoral radio frequency coil to be attached to the saliva aspiration device. For example, the receiving section can be shaped to conform to the outer surface of the portion of the intraoral radio frequency coil to be attached to the saliva aspiration device.

[0047] When a saliva suction device including a receiving section is provided, the process of attaching the saliva suction device to the intraoral radio frequency coil can be facilitated. Furthermore, the user can advantageously visually identify the correct relative orientation between the saliva suction device and the intraoral radio frequency coil based on the shape of the receiving section.

[0048] In another embodiment, the saliva suction device of the present invention includes a holding element configured to hold an intraoral radio frequency coil in a predetermined relative position with respect to the saliva suction device.

[0049] The retaining element can be configured as a clamping element, a locking element, a sliding element, a hook-and-loop fastener, etc. For example, the retaining element may include a pin, bolt, or cover configured to secure the intraoral radio frequency coil to the saliva suction device.

[0050] According to one embodiment, the retaining element includes a hinge, a movable connector, and / or a sheet-like structure configured to arrange the retaining element in an "open" position and a "closed" position. For example, when arranged in the "open" position, the retaining element can provide a channel for access to a receiving section of the saliva suction device, particularly a section of the intraoral radio frequency coil disposed within the receiving section of the saliva suction device. When arranged in the "closed" position, the retaining element can secure the intraoral radio frequency coil at a predetermined relative position to the saliva suction device.

[0051] A saliva aspiration device including a retaining element can provide an improved mechanical connection between the saliva aspiration device and the intraoral radiofrequency coil. Therefore, any undesirable separation of the intraoral radiofrequency coil from the saliva aspiration device in the patient's mouth can be advantageously avoided, while still allowing for easy and / or time-saving disassembly after magnetic resonance imaging has been performed and the intraoral radiofrequency coil has been removed from the patient's mouth.

[0052] According to an embodiment of the saliva suction device of the present invention, the body comprises or is made of an elastic material, the elastic material being configured to allow the body to reversibly deform under manual action.

[0053] The body of the saliva suction device may include or be made of the elastic material according to the above embodiments. For example, the body may be made of a natural or synthetic elastomer.

[0054] The body is configured to attach to and / or detach from the intraoral radio frequency coil under reversible deformation. Preferably, the body or receiving section of the saliva aspiration device is slightly smaller in size than the portion of the intraoral radio frequency coil to be attached to the saliva aspiration device. It is conceivable that the elastic material of the body is configured to stretch over a portion or section of the intraoral radio frequency coil, thus holding the intraoral radio frequency coil in place by the elastic restoring force of the elastic material.

[0055] Furthermore, at least a portion of the body, including or made of elastic material, can be configured to function as a hinge or joint for retaining the element. For example, the portion of the body including elastic material can be configured to deform or bend such that the retaining element can be variably arranged in an "open" or "closed" position according to the above embodiment.

[0056] It is also conceivable that segments including an elastic material or a body made of an elastic material are configured to wrap around or surround the edge or segment of the intraoral radio frequency coil, thus providing a form-locking connection and / or force-locking connection between the saliva suction device and the intraoral radio frequency coil.

[0057] A saliva suction device, including a body capable of reversible deformation, can advantageously facilitate the process of attaching the saliva suction device to an intraoral radio frequency coil.

[0058] According to one embodiment, the intraoral radio frequency coil may include a body configured to mechanically engage with a portion of a saliva aspiration device. Specifically, a portion of the body of the saliva aspiration device may be shaped to complement a portion of the intraoral radio frequency coil. It is also contemplated that a portion of the intraoral radio frequency coil is shaped and / or configured to mechanically engage with a portion of the body of the saliva aspiration device to provide a mechanical connection between the saliva aspiration device and the intraoral radio frequency coil.

[0059] According to an embodiment, the saliva suction device of the present invention includes a portable vacuum system fluidly connected to the suction opening.

[0060] The portable vacuum system can be fluidly connected to one or more suction openings of the saliva suction device according to the above embodiments.

[0061] Portable vacuum systems can be configured to be lifted and / or carried by users such as medical personnel, technicians, or patients. In particular, portable vacuum systems can be configured to be placed in different locations, such as different locations within an examination room.

[0062] In a preferred embodiment, the portable vacuum system is configured to be detachable from the saliva suction device and / or the fluid tubing connected to the saliva suction device. For example, the portable vacuum system may include a quick connector or detachable tubing connection configured to provide fluid connection to one or more suction openings of the saliva suction device.

[0063] It is conceivable that the fluid tubing or fluid connector for connecting the portable vacuum system to one or more suction openings of the saliva aspiration device is at least partially embedded within the patient table or the patient positioning device of the magnetic resonance imaging (MRI) device, which includes an intraoral radiofrequency coil. Therefore, it is advantageous to avoid patient irritation from the fluid tubing or fluid connector within the imaging area of ​​the MRI device, while still allowing for rapid and / or easy setup of the saliva aspiration device for MRI measurements of the patient's dental regions.

[0064] When examining other parts of the patient's body, such as those insensitive to swallowing, the portable vacuum system can be advantageously removed from the patient table or patient positioning device. This allows the imaging area and / or patient access area of ​​the MRI apparatus to remain as free as possible, facilitating interaction with the patient.

[0065] The combined intraoral aspiration device of the present invention includes a saliva aspiration device and an intraoral radio frequency coil that can be attached to the saliva aspiration device. The intraoral radio frequency coil is configured to receive magnetic resonance signals from the patient's dental region when the combined intraoral aspiration device is properly positioned in the patient's oral cavity for magnetic resonance measurement of the dental region.

[0066] The saliva aspiration device and the intraoral radio frequency coil can be constructed according to the above embodiments. In particular, the saliva aspiration device can be reversibly attached to the intraoral radio frequency coil via a shape-locking mechanical connection and / or a force-locking mechanical connection.

[0067] The combined intraoral suction device of the present invention enjoys the advantages of the saliva suction device of the present invention according to the above embodiments.

[0068] According to an embodiment of the combined intraoral suction device of the present invention, the body of the saliva suction device and the intraoral radio frequency coil are permanently or irreversibly attached to each other. For example, the body of the saliva suction device and the intraoral radio frequency coil may form an adhesive or bonded structure. Preferably, the saliva suction device includes a body having one or more suction openings constructed according to the above embodiment. When the combined intraoral suction device is properly arranged in a patient's oral cavity, the combined intraoral suction device may be shaped such that the portion of the saliva suction device including one or more suction openings is arranged between the inner surfaces of the teeth and cheeks and / or between the patient's teeth and tongue.

[0069] When the intraoral radiofrequency coil attached to the saliva aspiration device is in contact with or correctly aligned with at least one dental arch of the patient, the combined intraoral aspiration device, the saliva aspiration device, and the intraoral radiofrequency coil can be considered correctly positioned inside the patient's oral cavity. For example, the signal conductor or antenna of the intraoral radiofrequency coil can be positioned within the occlusal plane between the patient's two dental arches. In particular, the signal conductor or antenna can be positioned to match and / or cover a portion or the entirety of the patient's dental arch. Preferably, the signal conductor or antenna is positioned to enable the acquisition of magnetic resonance signals from a specific portion or the entirety of the patient's dental arch.

[0070] When providing a combined intraoral aspiration device that includes an intraoral radiofrequency coil permanently attached to the saliva aspiration device, the processes of attaching the intraoral radiofrequency coil to the saliva aspiration device and / or detaching the intraoral radiofrequency coil from the saliva aspiration device can be advantageously omitted. Therefore, the time required to prepare the dental region for magnetic resonance imaging measurements can be advantageously reduced.

[0071] The magnetic resonance device of the present invention is configured to perform magnetic resonance measurements on a patient’s dental region located within the imaging area of ​​the magnetic resonance device.

[0072] Magnetic resonance imaging (MRI) devices can be configured to acquire magnetic resonance image data, particularly diagnostic MRI image data, from a patient positioned within an imaging area. The patient can be a human or an animal. In a preferred embodiment, the MRI device is configured to perform magnetic resonance measurements on a patient's dental region. Specifically, the MRI device can be configured to acquire magnetic resonance signals from the patient's dental region via an intraoral radiofrequency coil.

[0073] The magnetic resonance imaging device of the present invention can represent a closed-aperture scanner. A closed-aperture scanner may include a generally cylindrical aperture that circumferentially encloses the imaging region. Specifically, the closed-aperture scanner may include one or more solenoid superconducting magnet coils that circumferentially surround the imaging region along the axial direction or rotational symmetry axis of the cylindrical aperture. The one or more superconducting magnet coils may include superconducting wires having negligible resistance at (or below) superconducting temperatures. The direction of the main magnetic field provided via the one or more superconducting magnet coils may be oriented substantially parallel to the direction in which the patient enters the imaging region and / or the axial direction of the cylindrical aperture.

[0074] The magnetic resonance apparatus of the present invention may include other components necessary for the proper operation of the magnetic resonance apparatus. For example, the magnetic resonance apparatus may include an external vacuum chamber, a magnet support structure, a heat shield, a cryogenic cooler, etc. In some embodiments, the magnetic resonance apparatus includes a refrigerant container and / or a heat buffer configured to store or preserve a fluid, particularly a refrigerant, at a predetermined temperature level. Preferably, the fluid or refrigerant exhibits a low boiling point. Examples of suitable fluids or refrigerants are argon, nitrogen, neon, helium, etc. The predetermined temperature level may substantially correspond to the superconducting temperature of the superconducting magnet coil.

[0075] A cryogenic cooler can be configured to cool one or more superconducting magnet coils of a magnetic resonance device and / or maintain one or more superconducting magnet coils at a temperature level close to the superconducting temperature. The superconducting coils, thermal shielding, magnet support structure, and / or refrigerant container can be thermally connected to the cryogenic cooler via solid thermal conductors, convection loops, and / or heat pipes.

[0076] According to the present invention, the magnetic resonance imaging device includes a control unit, a saliva aspiration device, and a vacuum system connected to an aspiration opening of the saliva aspiration device. The aspiration opening is configured to remove saliva from the patient's oral cavity.

[0077] Preferably, the saliva aspiration device is configured to remove saliva from the patient's mouth during magnetic resonance imaging (MRI) measurements of the patient's dental region. The saliva aspiration device and vacuum system can be constructed according to the embodiments described above.

[0078] The control unit is configured to enable and disable the vacuum system. The control unit can be part of the main control unit of the magnetic resonance imaging (MRI) device. However, the control unit can also be a separate or independent component connected to the main control unit via suitable signal connections.

[0079] The control unit can be connected to the vacuum system via a suitable signal connection. Specifically, the control unit can be configured to output a control signal to enable and disable the vacuum system. Therefore, the control unit can control the pressure at one or more suction openings of the saliva aspiration device. For example, the control unit can be configured to turn the vacuum system off or on via a dedicated control signal. In particular, the control unit can be configured to enable and disable the vacuum system during magnetic resonance imaging (MRI) measurements.

[0080] MRI devices that include a saliva aspiration device can allow saliva to be removed from the patient's mouth during MRI measurements. Therefore, it is advantageous to reduce or avoid motion and / or image artifacts associated with swallowing saliva.

[0081] According to an embodiment of the magnetic resonance apparatus of the present invention, the control unit is configured to enable and disable the vacuum system based on the imaging sequence measured by magnetic resonance.

[0082] The control unit can be configured to output control signals for enabling and disabling the vacuum system based on the imaging sequence of the magnetic resonance imaging device. For example, the control unit can be configured to shut down or pause the vacuum system before or during the acquisition of magnetic resonance signals. However, the control unit can also be configured to turn on or enable the vacuum system between the first and second magnetic resonance signal acquisitions and / or after magnetic resonance signal acquisition has been completed, during periods when no magnetic resonance signals are being acquired.

[0083] The magnetic resonance apparatus of the present invention advantageously allows for the coordinated or timing of saliva removal based on the acquisition of magnetic resonance signals from an imaging sequence of magnetic resonance measurements. Therefore, motion associated with the removal of saliva or fluid from the patient's mouth can be avoided, particularly shortly before and / or during the acquisition of magnetic resonance signals, but also repeatedly during the magnetic resonance measurement. Consequently, motion artifacts can be reduced and / or the quality of magnetic resonance images based on the acquired magnetic resonance signals can be improved.

[0084] According to an embodiment of the magnetic resonance device of the present invention, the saliva aspiration device is formed as part of the combined intraoral aspiration device according to the above embodiment.

[0085] The saliva aspiration device can be configured to be reversibly attached to the intraoral radio frequency coil of the magnetic resonance imaging device according to the above embodiment. However, the saliva aspiration device can also be permanently or irreversibly attached to the intraoral radio frequency coil of the magnetic resonance imaging device according to the above embodiment.

[0086] The magnetic resonance device of the present invention enjoys the advantages of the combined intraoral aspiration device of the present invention.

[0087] According to an embodiment of the magnetic resonance apparatus of the present invention, the control unit is configured to automatically deactivate the vacuum system during the duration of magnetic resonance signal acquisition.

[0088] Preferably, the control unit is also configured to reactivate the vacuum system after magnetic resonance signals have been acquired. The control unit can be configured to control the vacuum system by outputting control signals to it via a suitable signal connection (e.g., wired or wireless). When the vacuum system is deactivated, the negative pressure at one or more suction ports can partially or completely cease (i.e., the absolute pressure at one or more suction ports can rise to or reach atmospheric pressure levels). Preferably, after magnetic resonance signals have been acquired, the negative pressure at one or more suction ports is restored by reactivating the vacuum system via the control system.

[0089] The control unit can be configured to disable the vacuum system for hundreds of milliseconds, fractions of a second, several seconds, fractions of a minute, or several minutes.

[0090] When a control unit is provided that is configured to automatically deactivate the vacuum system during the duration of magnetic resonance signal acquisition, image artifacts caused by the flow of saliva and / or air near one or more suction openings can be advantageously reduced or avoided.

[0091] In another embodiment of the magnetic resonance apparatus according to the invention, the control unit is configured to enable or disable the vacuum system based on a trigger signal provided together with the imaging sequence, wherein the trigger signal defines one or more time periods during which the vacuum system is enabled or disabled during the imaging sequence.

[0092] The trigger signal can determine or specify the time point when the vacuum system is turned on or off. The trigger signal can also trigger the control unit to output a control signal to the vacuum system according to the above embodiment.

[0093] The control unit and / or a processing unit connected to or forming part of the control unit can be configured to determine a trigger signal for an imaging sequence to be executed. Specifically, the control unit and / or processing unit can be configured to determine the trigger signal for an imaging sequence configured to acquire magnetic resonance signals from a patient's dental region. However, it is also contemplated that the trigger signal forms part of the imaging sequence. Furthermore, the trigger signal can be determined by a predetermined schedule of the imaging sequence. Preferably, the control unit includes logic units, particularly transistor-transistor (TTL) logic, configured to provide or output the trigger signal for the imaging sequence. It is contemplated that one or more trigger signals are provided together with the imaging sequence.

[0094] Preferably, the imaging sequence is configured to acquire magnetic resonance signals from a patient's dental region, particularly the dental arch, teeth, several teeth, jaw, and / or mandible. The imaging sequence can have a very short echo time to compensate for the short T2 relaxation time of hard tissues, such as the dentin or enamel of teeth. The very short echo time can be less than 150 μs or less than 70 μs. In particular, the imaging sequence may include FLASH (fast low-angle imaging) or UTE (ultra-short echo time) sequences. However, it is also conceivable that the imaging sequence includes a longer echo time, such as a TSE (turbine spin echo) sequence. Imaging sequences with short echo times allow for the detection of magnetic resonance signals from hard tissues, while imaging sequences with longer echo times may result in a lack of signal from hard tissues. In image data acquired via imaging sequences with longer echo times, teeth can be distinguished, for example, by a lack of signal intensity compared to surrounding tissues.

[0095] During the imaging sequence, the intraoral radiofrequency coil can be directly positioned adjacent to the patient's teeth and / or dental arch to capture magnetic resonance signals from one or more of the patient's teeth. Preferably, the intraoral radiofrequency coil is arranged within the occlusal plane between the patient's dental arches.

[0096] When a control unit is provided that is configured to enable or disable the vacuum system based on a trigger signal provided along with the imaging sequence, the enabling or disabling of the vacuum system can advantageously be coordinated with a predetermined schedule of a particular imaging sequence. Therefore, the duration of magnetic resonance measurements can be advantageously shortened.

[0097] Furthermore, the magnetic resonance apparatus of the present invention can be configured to take into account the dynamics of the vacuum system, such as the time required to raise or lower the negative pressure at one or more suction openings to a desired level. Therefore, it is advantageous to reduce or avoid image artifacts and / or to improve the efficiency of saliva removal from the patient's mouth.

[0098] In a preferred embodiment of the magnetic resonance apparatus of the present invention, the control unit is configured to pause the acquisition of magnetic resonance signals after a predetermined time interval, particularly less than 30 seconds, less than 60 seconds, less than 90 seconds, less than 120 seconds, less than 150 seconds, less than 180 seconds, less than 210 seconds, less than 240 seconds, less than 270 seconds, or less than 300 seconds, and to activate the vacuum system to run for a predetermined period of time before resuming the acquisition of magnetic resonance signals.

[0099] The control unit can be configured to pause magnetic resonance measurements, specifically pausing the acquisition of imaging sequences and / or magnetic resonance signals, after a predetermined time interval. The predetermined time interval can be defined as a period of time after which saliva removal must begin or be repeated. In particular, the predetermined time interval can be characterized by a certain amount of time after which a limited amount of saliva is typically released from the patient's oral cavity, thereby stimulating a swallowing urge.

[0100] The control unit can be configured to interrupt or pause the execution of magnetic resonance measurements and / or imaging sequences. It is conceivable that the processing unit of the control unit is configured to calculate interruptions or pauses within the imaging sequence, ensuring compliance with predetermined time intervals without directly interrupting the acquisition of magnetic resonance signals. For example, the imaging sequence can be interrupted between different acquisitions of magnetic resonance signals, during or after gradient pulse emission, during relaxation time, or between interruptions required to ensure or monitor specific absorption rate (SAR) limits and / or adjust imaging parameters (e.g., parameters of the scan or imaging protocol or parameters related to the position and / or orientation of the intraoral radio frequency coil). It is also conceivable that the control unit is configured to lengthen or extend the interruption between two subsequent imaging sequences or scans within a predetermined time interval.

[0101] In a preferred embodiment, the control unit is configured to interrupt or pause magnetic resonance measurements between conditioning scans and / or imaging scans and to activate the vacuum system for a predetermined period of time. Conditioning scans may include or represent navigation scans, projection scans, or any other coarse-resolution and / or time-effective scans configured to determine the spatial location and / or relative spatial arrangement of one or more features (e.g., landmarks or anatomical markers) in a dental region. In particular, conditioning scans can be used to plan the field of view for subsequent imaging scans. Imaging scans may be configured to acquire magnetic resonance images, particularly high-resolution magnetic resonance images, from at least a portion of the patient's dental region. Magnetic resonance measurements may include one or more conditioning scans and one or more imaging scans. Multiple magnetic resonance images (also referred to as "averaging") may be acquired during multiple imaging scans, which can be used to improve the quality or accuracy of the acquired magnetic resonance data of the dental region. The control unit may be configured to interrupt magnetic resonance measurements between two conditioning scans, between a conditioning scan and an imaging scan, and between two or more imaging scans, and to activate the vacuum system for a predetermined period of time before resuming magnetic resonance measurements. Specifically, the control unit can be configured to interrupt the magnetic resonance measurement and activate the vacuum system after each conditioning scan and each imaging scan, with the final imaging scan of the magnetic resonance measurement being an optional exception. The predetermined time interval can correspond to the duration of the conditioning scan and / or imaging scan. It is conceivable that the predetermined time interval will vary according to the progress of the magnetic resonance measurement, particularly according to the duration of the upcoming conditioning scan and / or imaging scan. The predetermined time interval can also correspond to the combined duration of multiple conditioning scans, the combined duration of conditioning and imaging scans, and / or the combined duration of multiple imaging scans.

[0102] The processing unit can be configured to determine the optimal time when the imaging sequence can be paused without directly interrupting the acquisition of magnetic resonance signals, while still ensuring that the predetermined time interval is met.

[0103] When MRI measurements are paused or MRI signal acquisition is suspended after a predetermined time interval and the vacuum system is activated, the amount of saliva in the patient's mouth can be advantageously kept below the limit that would trigger or over-enhance the patient's swallowing urge.

[0104] According to the implementation of the magnetic resonance device, the control unit is configured to activate the vacuum system before or during the imaging sequence to run a predetermined activation period, and to pause the imaging sequence during the predetermined activation period.

[0105] The predetermined activation period can refer to the amount of time required to remove a predetermined amount of saliva from the patient's mouth. The predetermined amount of saliva can be defined as a portion of the typical amount of saliva or more than 50%, 60%, 70%, 80%, or 90% of the typical amount of saliva that induces the urge to swallow. The predetermined activation period can also depend on the characteristics of the vacuum system and / or the saliva aspiration device, such as the capacity or power of the delivery unit, the diameter of the fluid conduit connecting the saliva aspiration device to the vacuum system, the number of aspiration openings, the average diameter of the aspiration openings, etc.

[0106] According to one implementation, the control unit is configured to activate the vacuum system before or during the imaging sequence to operate a predetermined activation period. Specifically, the control unit can be configured to pause the acquisition of magnetic resonance signals during the predetermined activation period.

[0107] By pausing the imaging sequence during a predetermined activation period, it is advantageous to avoid the accumulation of critical or extreme amounts of saliva that could trigger or cause a swallowing urge.

[0108] According to an embodiment, the magnetic resonance imaging device of the present invention includes an output device. The output device is configured to output information to the patient regarding the period during which the vacuum system is activated or deactivated.

[0109] The output device can be configured to output auditory, visual, and / or tactile signals. For example, the output device can be configured to output sound, melody, instructions, images, video, and / or vibration. Preferably, the output provided by the output device is configured to inform the patient about the period during which the vacuum system is activated or deactivated. The output can be self-evident or can be understood in conjunction with further information, such as verbal instructions from medical personnel or written instructions given to the patient prior to the MRI measurement.

[0110] Preferably, information regarding the time period during which the vacuum system is activated or deactivated informs the patient when they can swallow without affecting the acquisition of magnetic resonance signals. For example, the control unit can be configured to activate or deactivate the vacuum system based on a predetermined schedule of the imaging sequence, particularly the start, end, and / or duration of the sequence of magnetic resonance signals and / or electromagnetic pulses (e.g., gradient pulses and / or radio frequency pulses).

[0111] It is also conceivable that this information informs the patient that the vacuum system is activated and that swallowing is safe. Therefore, the patient could intentionally swallow during subsequent MRI signal acquisition to further reduce saliva in the mouth and / or mitigate the urge to swallow. Furthermore, the output of the output device could be configured to prevent the patient from swallowing during data acquisition, for example, by providing an indication during MRI signal acquisition.

[0112] According to one implementation, the control unit is configured to control the output device to output information about the time period during which the vacuum system is activated or deactivated. The control unit can be connected to the output device via a suitable signal connection. The output device can form part of a magnetic resonance apparatus, particularly a vacuum system.

[0113] An output device configured to provide the patient with information about the duration during which the vacuum system is enabled or disabled can advantageously inform the patient that swallowing is safe during this period without affecting the MRI measurement. Furthermore, the output can also help inform the patient to avoid movement, particularly swallowing movements, during or shortly before MRI signal acquisition.

[0114] The present invention also relates to a computer-implemented method for removing saliva from a patient's oral cavity during magnetic resonance imaging (MRI) measurements. The method includes the steps of enabling and disabling a vacuum system fluidly connected to the suction opening of a saliva aspiration device disposed within the patient's oral cavity, based on an imaging sequence from the MRI measurement.

[0115] According to some embodiments, the method of the present invention may include:

[0116] - Automatically shut down the vacuum system during the duration of magnetic resonance signal acquisition.

[0117] - The vacuum system is enabled or disabled based on a trigger signal provided with the imaging sequence, wherein the trigger signal defines one or more time periods during the imaging sequence during which the vacuum system is enabled or disabled.

[0118] - After a predetermined time interval, specifically less than 30 seconds, less than 60 seconds, less than 90 seconds, less than 120 seconds, less than 150 seconds, less than 180 seconds, less than 210 seconds, less than 240 seconds, less than 270 seconds, or less than 300 seconds, the acquisition of magnetic resonance signals is paused, and the vacuum system is activated to run for a predetermined period of time before resuming the acquisition of magnetic resonance signals.

[0119] - Activate the vacuum system before or during the imaging sequence to run a predetermined activation period and pause the imaging sequence during the predetermined activation period, and / or

[0120] - Provide the patient with information about the time periods during which the vacuum system was enabled or disabled.

[0121] The saliva aspiration device can be implemented according to the embodiments described herein. Preferably, the magnetic resonance device of the present invention according to the above embodiments is configured to perform one or more embodiments of the method of the present invention.

[0122] The method of the present invention enjoys the advantages of the magnetic resonance apparatus of the present invention according to the above embodiments.

[0123] The present invention also relates to a computer program product that can be loaded into the memory of a programmable processing unit of a magnetic resonance apparatus according to the above embodiments. The computer program product of the present invention includes program code means for executing the method of the present invention according to the above embodiments when the computer program product is executed in the processing unit of the magnetic resonance apparatus.

[0124] Therefore, the method according to the invention can be performed quickly, robustly, and repeatably. The computer program product is configured such that it can execute the method of the invention by means of a processing unit. The processing unit includes prerequisites required for performing certain embodiments of the method of the invention, such as main memory, a graphics card, or a logic unit.

[0125] Computer program products, for example, stored on computer-readable media or on a network, server, or cloud, can be loaded from these locations into the processor of a local processing unit. The local processing unit can be directly connected to the magnetic resonance imaging (MRI) device or designed as part of the MRI device, such as part of the MRI device's control unit. Furthermore, control information of the computer program product can be stored on an electronically readable medium. The control information on the electronically readable medium can be designed such that when the medium is used, the control information executes the method according to the invention in the processing unit of the MRI device. Examples of electronically readable media are DVDs, magnetic tapes, or USB sticks on which electronically readable control information, particularly software, is stored. If the control information is read from the medium and stored in the control unit and / or processing unit of the MRI device, all embodiments of the method of the invention described above can be performed. Attached Figure Description

[0126] Other advantages and details of the invention can be appreciated from the embodiments described below and the accompanying drawings. The drawings show:

[0127] Figure 1 This is a schematic diagram illustrating an embodiment of the magnetic resonance device of the present invention.

[0128] Figure 2 This is a schematic diagram of an embodiment of the saliva suction device of the present invention.

[0129] Figure 3 This is a schematic diagram of an embodiment of the combined intraoral suction device of the present invention.

[0130] Figure 4 This is a schematic diagram of an embodiment of the combined intraoral suction device of the present invention.

[0131] Figure 5 This is a schematic diagram of an embodiment of the combined intraoral suction device of the present invention.

[0132] Figure 6 This is a schematic diagram of an embodiment of the combined intraoral suction device of the present invention.

[0133] Figure 7 This is a schematic diagram of an embodiment of the combined intraoral suction device of the present invention.

[0134] Figure 8 This is a schematic diagram of an embodiment of the combined intraoral suction device of the present invention.

[0135] Figure 9 This is a schematic diagram of an embodiment of the magnetic resonance device of the present invention. Detailed Implementation

[0136] Figure 1 An embodiment of a magnetic resonance imaging (MRI) device 10 according to the present invention is illustrated. In the illustrated example, the MRI device 10 includes a static field magnet or main magnet 12 configured to provide a homogeneous static magnetic field 13 (BO field). The static magnetic field 13 passes through an imaging region 14 configured to receive an imaging object, such as a patient 15. The imaging region 14 may correspond to a patient aperture configured to accommodate the patient 15 during MRI measurements. The imaging region 14 is surrounded by the main magnet 12 in the circumferential direction.

[0137] The magnetic resonance imaging (MRI) device 10 may include a patient positioning device 16 configured to transport a patient 15 into an imaging region 14. Specifically, the patient positioning device 16 may be configured to transport a diagnostically relevant body region of the patient 15 into an imaging volume or isocenter (not shown) of the MRI device 10. The main magnet 12 and other components of the MRI device 10 may be concealed within a housing 60.

[0138] The magnetic resonance apparatus 10 may include a gradient system comprising one or more gradient coils 18. The one or more gradient coils may be configured to generate gradient magnetic fields in different spatial directions, preferably orthogonally oriented spatial directions. The gradient magnetic fields may be used to spatially encode magnetic resonance signals or data acquired during magnetic resonance measurements. The one or more gradient coils 18 may be enabled or controlled via control signals provided by a gradient control unit 19.

[0139] The magnetic resonance imaging (MRI) device 10 may also include an integrated radio frequency (RF) antenna 20 (i.e., a body coil). The RF antenna 20 may be enabled or controlled via an RF control unit 21. The RF control unit 21 may be configured to control the RF antenna 20 to generate a high-frequency magnetic field (B1 field) and to transmit RF excitation pulses to the imaging region 14. The MRI device 10 may also include a local coil 26. The local coil 26 may be positioned close to a diagnostically relevant region of the patient 15, particularly the jaw region or dental region. The local coil 26 may be configured to transmit RF excitation pulses to and / or receive MRI signals from the patient 15. It is conceivable that the body coil 20 and the local coil 26 are controlled via the RF controller 21.

[0140] In the depicted example, the local coil 26 includes an intraoral radiofrequency coil 41 configured to be inserted into the oral cavity of the patient 15 (see [link]). Figures 3 to 8 The intraoral radiofrequency coil 41 is connected to the radiofrequency controller 21 via an electrical connection cable 27. The local coil 26 also includes a saliva aspiration device 30 configured to remove saliva from the oral cavity of the patient 15 (see [link]). Figures 2 to 8 The saliva aspiration device 30 can be connected to the vacuum system 50 via a fluid conduit 51. The vacuum system 50 can be portable. However, the vacuum system 50 can also be mechanically integrated and / or electrically integrated into the magnetic resonance imaging device 10, particularly the patient positioning device 16. The intraoral radiofrequency coil 41 can be reversibly or irreversibly attached to the saliva aspiration device 30. Preferably, the saliva aspiration device 30 and the intraoral radiofrequency coil 41 form a configuration according to... Figures 3 to 8 The combined intraoral suction device 40 of the embodiment described in the text.

[0141] The magnetic resonance imaging (MRI) device 10 includes a control unit 22 configured to control the MRI device 10. The control unit 22 may include a processing unit 28 configured to process MRI signals and reconstruct MRI images. The processing unit 28 may also be configured to process input from a user of the MRI device 10 and / or provide output to the user. For this purpose, the processing unit 28 and / or the control unit 22 may be connected to a display unit 24 and an input unit 25 via suitable signal connections. For preparation of MRI measurements, preparation information, such as imaging parameters or patient information, may be provided to the user via the display unit 24. The input unit 25 may be configured to receive information and / or imaging parameters from the user.

[0142] exist Figure 1In the embodiment depicted, the control unit 22 is configured to transmit a control signal via electrical signal line 53 to enable or disable the vacuum system 50. When the vacuum system 50 is disabled or turned off, the pressure at the suction opening of the saliva aspiration device 30 can correspond to atmospheric pressure or the pressure within the patient's oral cavity 15. However, when the vacuum system 50 is enabled, the pressure at the suction opening of the saliva aspiration device 30 can drop to a negative pressure. Preferably, the control unit 22 is configured to enable and disable the vacuum system 50 based on the imaging sequence measured by magnetic resonance imaging.

[0143] The magnetic resonance imaging (MRI) device 10 of the present invention is configured to perform MRI measurements on a patient 15, particularly MRI measurements of the dental region of the patient 15 located within the imaging region 14. In a preferred embodiment, the local coil 26 is configured as an intraoral radiofrequency coil 41 attached to a saliva aspiration device 30, the saliva aspiration device 30 having a body 31 including one or more aspiration openings 32 fluidly connected to a vacuum system 50 via a fluid conduit 51 (see [link to documentation]). Figures 3 to 8 The control unit 22 is configured to enable and disable the vacuum system 50 based on the imaging sequence measured by magnetic resonance. In particular, the control unit 22 can be configured to automatically disable the vacuum system 50 during the duration of magnetic resonance signal acquisition.

[0144] For example, control unit 22 can be configured to deactivate or shut down vacuum system 50 once or more during the imaging sequence via a control signal transmitted through electrical signal line 53. Thus, the imaging sequence can proceed as normal, but vacuum system 50 can be deactivated once or more to prevent movement of tissues or fluids in the oral cavity during magnetic resonance signal acquisition.

[0145] In another example, control unit 22 may be configured to enable or disable vacuum system 50 based on a trigger signal provided along with the imaging sequence. The trigger signal may be determined and / or provided by processing unit 28 and / or control unit 22. However, the trigger signal may also correspond to a specific electromagnetic pulse transmitted via gradient control unit 19 and / or radio frequency control unit 21. Control unit 22 and / or processing unit 28 may be configured to enable or disable vacuum system 50 based on such a specific electromagnetic pulse.

[0146] The trigger signal may be dependent on the imaging sequence to be performed. For example, different trigger signals may be provided with different imaging sequences. Preferably, the trigger signal defines or indicates one or more time periods during which the vacuum system 50 should be enabled or disabled during the imaging sequence.

[0147] According to another embodiment, the control unit 22 is configured to pause the acquisition of magnetic resonance signals after a predetermined time interval, particularly a time interval of less than 30s, less than 60s, less than 90s, or less than 120s, and to activate the vacuum system 50 to run for a predetermined period of time before resuming the acquisition of magnetic resonance signals.

[0148] For example, the control unit 22 is configured to alter or change the predetermined schedule of the imaging sequence by pausing or interrupting the imaging sequence and activating the vacuum system 50 to run for a predetermined period of time. After the predetermined period of time has expired, the control unit 22 can deactivate or shut down the vacuum system 50 and resume the interrupted or paused imaging sequence. Therefore, severe accumulation of saliva in the patient 15's mouth can be avoided, and magnetic resonance signals can be acquired without the patient 15 needing to suppress the urge to swallow for extended periods.

[0149] In another embodiment, the control unit 22 is configured to activate the vacuum system 50 before or during the imaging sequence to run a predetermined activation period, and to pause the imaging sequence during the predetermined activation period.

[0150] Of course, the magnetic resonance device 10 may include other components and / or functions commonly found in magnetic resonance devices. The general operation of the magnetic resonance device 10 is known to those skilled in the art, and therefore a more detailed description is omitted.

[0151] Figure 2 An embodiment of the saliva suction device 30 of the present invention is depicted. The saliva suction device 30 includes a body 31 configured to be inserted into the oral cavity of a patient 15. It is conceivable that only a portion 31a of the saliva suction device 30 is configured to be inserted into the oral cavity. The body 31 includes a plurality of suction openings 32 connected to a fluid tube 51 via a port 33. Preferably, the saliva suction device 30 is shaped such that when the saliva suction device is properly positioned in the oral cavity of the patient 15, the suction openings 32 are positioned between the patient 15's teeth and inner cheek and / or between the patient 15's teeth and tongue.

[0152] The portion 31a of the body 31 is shaped to surround at least a portion of the radio frequency coil 41 within the port (see [reference]). Figures 3 to 8 It also provides a shape-locking mechanical connection and / or force-locking mechanical connection with the intraoral RF coil 41. In the depicted example, the clamp portion 31a is configured to receive and surround the intraoral RF coil 41 from two opposite sides and securely hold the intraoral RF coil 41 in place.

[0153] The body 31 of the saliva suction device 30 may also include a receiving section 34, which is configured to receive a portion of the coil 41 inside the mouth, particularly the edge (see...). Figure 6The receiving section 34 can be configured to provide a shape-locking mechanical connection between the saliva suction device 30 and the intraoral radio frequency coil 41, and to prevent any movement of the intraoral radio frequency coil 41 relative to the saliva suction device 30 in a direction orthogonal to the plane defined by the portion 31a of the body 31.

[0154] Figure 3 An embodiment of the combined intraoral suction device 40 of the present invention is shown. The combined intraoral suction device 40 includes a saliva suction device 30 reversibly or irreversibly attached to an intraoral radiofrequency coil 41. The portion of the combined intraoral suction device 40 including the intraoral radiofrequency coil 41 can be shaped such that it is disposed within the oral cavity of a patient 15. Preferably, the intraoral radiofrequency coil 41 has a substantially planar or flat shape configured to be disposed in the occlusal plane between the two dental arches of the patient 15.

[0155] The intraoral radio frequency coil 41 may include the electronic circuitry 42 according to the above embodiment. When the intraoral radio frequency coil is properly positioned within the oral cavity of the patient 15, the electronic circuitry 42 may protrude from or be positioned outside the oral cavity of the patient 15 for magnetic resonance measurement. In the depicted example, the electronic circuitry 42 is attached to the body 31 of the saliva aspiration device 30; however, the electronic circuitry 42 may also be at least partially embedded within the body 31 of the saliva aspiration device 30. The electronic circuitry 42 electrically connects the intraoral radio frequency coil 41 to the radio frequency control unit 21 via an electrical connection cable 27 (see [link to relevant documentation]). Figure 1 The electronic circuit 42 may also include a wireless communication unit configured to wirelessly transmit magnetic resonance data to the control unit 22 and / or processing unit 28 of the magnetic resonance apparatus 10. In an alternative embodiment, the intraoral radiofrequency coil 41 is inductively connected to an external radiofrequency coil, particularly an extraoral radiofrequency coil surrounding the jaw region of the patient 15.

[0156] Port 33 fluidly connects one or more suction openings 32 (not shown) of the saliva suction device 30 to a vacuum system 50 via a fluid conduit 51. The vacuum system 50 includes a delivery unit 52, preferably a compressor, configured to evacuate the fluid conduit 51 and provide negative pressure at one or more suction openings 32. Saliva removed from the patient 15's mouth can be separated from the fluid conduit 51 via a suitable siphon device (not shown).

[0157] Figure 4An embodiment of the combined intraoral suction device 40 of the present invention is shown, the combined intraoral suction device 40 including a saliva suction device 30 reversibly attached to an intraoral radio frequency coil 41. In the depicted example, the body 31 of the saliva suction device 30 includes a U-shaped section configured to surround the outer edge or margin of the intraoral radio frequency coil 41. The U-shaped section may correspond to a receiving section 34 of the saliva suction device 30.

[0158] Additionally, the body 31 of the saliva suction device 30 includes a retaining element 35. The retaining element 35 may correspond to a plurality of protrusions or ridges forming a continuous or discontinuous line along the inner surface of the U-shaped receiving section 34 of the saliva suction device 30. In the depicted example, the intraoral radio frequency coil 41 includes a recessed shape complementary to the retaining element 35 of the saliva suction device 30. The recess allows mechanical engagement between the intraoral radio frequency coil 41 and the retaining element 35. Specifically, the recess allows the intraoral radio frequency coil 41 to slide into the receiving section 34 of the saliva suction device 30 in a direction orthogonal to the plane defined by the cross-sectional region AA. The retaining element 35 provides a form-locking mechanical connection and / or force-locking mechanical connection between the saliva suction device 30 and the intraoral radio frequency coil 41, and prevents relative movement between the saliva suction device 30 and the intraoral radio frequency coil 41 in any direction parallel to the plane defined by the cross-sectional region AA.

[0159] A portion of the body 31 of the saliva aspiration device 30 can be configured to surround one or more segments of the dental arch of the patient 15. Thus, the body 31 can serve as a spacer between the inner surface of the patient 15's cheek and the teeth 70, preventing the aspiration opening 32 from trapping soft tissue within the oral cavity and allowing for more efficient removal of saliva. Furthermore, it can advantageously facilitate the placement of the intraoral radiofrequency coil 41 in the correct position for magnetic resonance imaging measurements, as the body 31 can be pushed onto the patient 15's dental arch to provide a proper relative position between the dental arch and the intraoral radiofrequency coil 41. Of course, the body 31 and the intraoral radiofrequency coil 41 of the combined intraoral aspiration device 40 can be configured in different sizes to accommodate differences in dental dimensions in children and adults of all ages.

[0160] Figure 5Another embodiment of the combined intraoral suction device 40 of the present invention is shown, comprising a saliva suction device 30 reversibly attached to an intraoral radio frequency coil 41. In the depicted example, the width W of the receiving section 34 is slightly smaller than the width of the intraoral radio frequency coil 41, thus providing a force-locking mechanical connection between the body 31 of the saliva suction device 30 and the intraoral radio frequency coil 41 when the intraoral radio frequency coil 41 is pushed into the receiving section 34. Preferably, the body 31 of the saliva suction device 30 is made of an elastic or flexible material configured to stretch over the section of the intraoral radio frequency coil 41, thereby holding the intraoral radio frequency coil 41 in place via the elastic restoring force of the elastic material.

[0161] like Figure 5 As depicted, the body 31 of the saliva suction device 30 may include a retaining section 35 configured to prevent the intraoral radio frequency coil 41 from being pushed through an opening provided by the receiving section 34. Therefore, the retaining element 35 may support or facilitate the process of attaching the intraoral radio frequency coil 41 to the saliva suction device 30.

[0162] Figure 6 It shows Figure 5 The illustration shows a variation of the combined intraoral suction device 40. In the depicted example, the retaining element 35 of the saliva suction device 30 is configured to mechanically engage with a section of the body 31 of the saliva suction device 30 and at least partially cover the U-shaped receiving section 34 to prevent the intraoral radio frequency coil 41 from disengaging from the body 31. For example, the retaining element 35 may be configured to slide along a groove provided along the inner surface of the U-shaped receiving section 34 in a direction orthogonal to the plane defined by the cross-sectional region AA.

[0163] It is also conceivable that the saliva aspiration device 30 includes a hinge or connector (not shown) that allows the retaining element 35 to fold over an opening provided by the receiving section 34. For example, the hinge or connector may be configured to fold or close the retaining element 35 onto a lateral surface (i.e., a surface orthogonally oriented to the plane defined by the cross-sectional region AA) or a transverse surface (i.e., a surface oriented parallel to the plane defined by the cross-sectional region AA) of the saliva aspiration device 30. The retaining element 35 may also include a fixing element (not shown), such as a pin, bolt, strip, and / or sheet, configured to hold the retaining element 35 in place.

[0164] exist Figure 6In the illustrated embodiment, a segment 31c of the body 31 of the saliva suction device 30 is disposed between the tooth 70 and the intraoral radio frequency coil 41. The segment 31c is configured to surround at least a portion of the intraoral radio frequency coil 41 and provide a protective cover for the intraoral radio frequency coil 41. For example, the segment 31c is configured to prevent direct mechanical contact between the tooth 70 and the intraoral radio frequency coil 41.

[0165] According to an embodiment, segment 31c includes or is composed of an electrical insulator configured to prevent current from being transmitted from the intraoral radio frequency coil 41 to the teeth 70 or other tissues in the patient's oral cavity. However, it is also conceivable that the intraoral radio frequency coil 41 includes a protective cap or coating configured to prevent direct mechanical contact and / or current transmission between the intraoral radio frequency coil 41 and the teeth 70.

[0166] Figure 7 Another embodiment of the combined intraoral suction device 40 of the present invention is illustrated, the combined intraoral suction device 40 including a saliva suction device 30 reversibly attached to an intraoral radio frequency coil 41. In the illustrated example, a receiving section 34 is formed as a groove along the inner surface of a U-shaped section of the body 31 of the saliva suction device 30. Ridges adjacent to or surrounding the groove or receiving section 34 can serve as retaining elements 35, which hold the intraoral radio frequency coil 41 in place and prevent the intraoral radio frequency coil 41 from moving relative to the body 31 in a direction parallel to the plane oriented by the cross-sectional region AA.

[0167] In order to attach the intraoral radio frequency coil 41 to the saliva suction device 30, the intraoral radio frequency coil 41 can slide into the receiving section 34 of the saliva suction device 30 along a direction orthogonally oriented to the plane defined by the cross-sectional region AA.

[0168] Figure 8Another embodiment of the combined intraoral suction device 40 of the present invention is shown. In this example, the receiving section 34 is configured as a U-shaped groove in the lateral surface of the body 31 of the saliva suction device 30. The combined intraoral suction device 40 may include a retaining element 35 (not shown) configured to hold the intraoral radio frequency coil 41 in a predetermined position relative to the body of the saliva suction device 30. For example, the retaining element 35 may be configured to cover the groove provided by the receiving section 34 and prevent the intraoral radio frequency coil 41 from moving in a direction parallel to the plane oriented by the cross-sectional region AA. However, it is also conceivable that the size of the receiving section 34 is slightly smaller than the size of the intraoral radio frequency coil 41, and that a force-locking mechanical connection with the intraoral radio frequency coil 41 is provided when the intraoral radio frequency coil 41 is pushed into the receiving section 34. Alternatively or alternatively, the surface of the receiving section 34 may include a rough or sticky coating configured to engage with the surface of the intraoral radio frequency coil 41 and prevent the intraoral radio frequency coil 41 from separating from the body 31 of the saliva suction device 30.

[0169] Figure 9 An embodiment of the magnetic resonance imaging (MRI) device 10 of the present invention is illustrated. The MRI device 10 includes an output device 54 configured to output information to a patient 15 regarding the duration during which a vacuum system 50 is activated or deactivated. In the depicted example, the output device 54 includes a speaker configured to provide an audible or instructive signal informing the patient 15 whether the vacuum system 50 is activated or deactivated. For example, the output device 54 may provide an alarm signal indicating that the vacuum system 50 is deactivated and that swallowing is not permitted for the patient 15. In another example, the output device 54 may output an audio message informing the patient 15 that the vacuum system 50 is activated and that swallowing is permitted for the patient 15.

[0170] According to one embodiment, the control unit 22 is configured to control the output device 54 to output information to the patient 15 regarding the duration during which the vacuum system 50 is activated or deactivated. However, the output device 54 may also be configured to output information regarding the duration during which the vacuum system 50 is activated or deactivated based on the operating status of the vacuum system 50 and / or signals received via the electrical connection line 53.

[0171] The embodiments described herein should be considered as examples. It should be understood that, unless otherwise explicitly stated, the various embodiments can be extended by features of other embodiments or combined with features of other embodiments. Figures 1 to 9 The implementation methods depicted are not necessarily drawn to scale.

Claims

1. A saliva aspiration device (30) for an intraoral radio frequency coil (41), the saliva aspiration device (30) comprising a body (31) and an aspiration opening (32), the aspiration opening (32) being configured to be connected to a vacuum system (50), wherein, The body (31) is configured to provide a mechanical connection between the saliva suction device (30) and the intraoral radio frequency coil (41), wherein the intraoral radio frequency coil (41) is configured to receive magnetic resonance signals from the dental region of the patient (15), and wherein the suction opening (32) is configured to remove saliva from the oral cavity of the patient (15) during magnetic resonance measurement.

2. The saliva suction device (30) according to claim 1, wherein, The body (31) is configured to surround at least a portion of the intraoral radio frequency coil (41) and / or provide a protective cover for at least a portion of the intraoral radio frequency coil (41).

3. The saliva suction device (30) according to any one of claims 1 or 2, wherein, The body (31) is shaped to surround at least a portion of the intraoral radio frequency coil (41) and provides a shape-locking mechanical connection and / or force-locking mechanical connection with said portion of the intraoral radio frequency coil (41).

4. The saliva suction device (30) according to any one of the preceding claims, wherein, The body (31) includes a receiving section (34) which is shaped to complement a section of the intraoral radio frequency coil (41) such that a shape-locking mechanical connection is provided between the section of the intraoral radio frequency coil (41) and the receiving section (34) of the saliva suction device (30).

5. The saliva suction device (30) according to any one of the preceding claims, comprising a retaining element (35) configured to hold the intraoral radio frequency coil (41) in a predetermined relative position with respect to the saliva suction device (30).

6. The saliva suction device (30) according to any one of the preceding claims, wherein, The body (31) comprises or is made of an elastic material configured to allow the body (31) to be reversibly deformed under manual action, and wherein the body (31) is configured to attach to and / or detach from the intraoral radio frequency coil (41) under reversible deformation.

7. The saliva suction device (30) according to any one of the preceding claims further includes a portable vacuum system (50) fluidly connected to the suction opening.

8. A combined intraoral aspiration device (40) comprising a saliva aspiration device (30) according to any one of the preceding claims and an intraoral radio frequency coil (41), the intraoral radio frequency coil (41) being attachable to the saliva aspiration device (30) and configured to receive magnetic resonance signals from a dental region of a patient (15) when the combined intraoral aspiration device (40) is properly positioned in the oral cavity of a patient (15) for magnetic resonance measurement of the dental region.

9. A magnetic resonance apparatus (10) configured to perform magnetic resonance measurements on a dental region of a patient (15) located within an imaging region of the magnetic resonance apparatus (10), the magnetic resonance apparatus (10) including a control unit (22), a saliva aspiration device (30), and a vacuum system (50) connected to an aspiration opening (32) of the saliva aspiration device (30), wherein, The suction opening (32) is configured to remove saliva from the mouth of the patient (15), and the control unit (22) is configured to enable and disable the vacuum system (50).

10. The magnetic resonance apparatus (10) according to claim 9, wherein, The saliva suction device (30) forms part of the combined intraoral suction device (40) according to claim 8.

11. The magnetic resonance apparatus (10) according to any one of claims 9 or 10, wherein, The control unit (22) is configured to enable and disable the vacuum system (50) based on the imaging sequence measured by the magnetic resonance.

12. The magnetic resonance apparatus (10) according to claim 11, wherein, The control unit (22) is configured to automatically deactivate the vacuum system (50) during the duration of acquiring the magnetic resonance signal.

13. The magnetic resonance apparatus (10) according to any one of claims 11 or 12, wherein, The control unit (22) is configured to enable or disable the vacuum system (50) based on a trigger signal provided together with the imaging sequence, wherein the trigger signal is defined as one or more time periods during which the vacuum system (50) is enabled or disabled during the imaging sequence.

14. The magnetic resonance apparatus (10) according to any one of claims 11 to 13, wherein, The control unit (22) is configured to pause the acquisition of magnetic resonance signals after a predetermined time interval, particularly less than 30s, less than 60s, less than 90s, less than 120s, less than 150s, less than 180s, less than 210s, less than 240s, less than 270s, or less than 300s, and to enable the vacuum system (50) to operate for a predetermined period of time before resuming the acquisition of magnetic resonance signals.

15. The magnetic resonance apparatus (10) according to any one of claims 11 to 14, wherein, The control unit (22) is configured to activate the vacuum system (50) before or during the imaging sequence to operate a predetermined activation period, and to pause the imaging sequence during the predetermined activation period.

16. The magnetic resonance apparatus (10) according to any one of claims 11 to 15 further includes an output device (54) configured to output information to the patient (15) regarding the time period during which the vacuum system (50) is activated or deactivated.

Images