Magnetic resonance device

Abstract

The invention relates to a magnetic resonance apparatus (10) comprising a field generating unit (12) configured to generate a main magnetic field comprising an imaging volume (30) and a support structure (11) configured to structurally support the field generating unit (12) wherein the field generating unit (12) comprises a first magnet (14) and a second magnet (18), the first magnet (14) comprises two magnet segments (14a, 14b) arranged at an angle to each other to form a triangular semi-open space (47) surrounding at least a portion of the imaging volume (30), and wherein the first magnet (14) and the second magnet (18) are arranged on opposite sides of the imaging volume (30).

Description

TECHNICAL FIELD

[0001] The present application relates to a dedicated magnetic resonance apparatus. BACKGROUND

[0002] Magnetic resonance tomography represents a well-known imaging method for acquiring images of the interior of an examination object. For performing a magnetic resonance measurement, the examination object is usually positioned in a strong and uniform static magnetic field (B0 field) of a magnetic resonance apparatus. The magnetic field strength of the static magnetic field can be in the range of 0.2 Tesla to 7 Tesla, thereby aligning the nuclear spins within the examination object along the static magnetic field. In order to trigger so-called nuclear spin resonance, a radio frequency excitation pulse is emitted into the examination object. Each radio frequency excitation pulse magnetizes the nuclear spins within the examination object to a certain amount, referred to as flip angle, off the static magnetic field. The radio frequency excitation pulse can comprise an alternating (electro-)magnetic field with a frequency corresponding to the Larmor frequency at the respective static magnetic field strength. The excited nuclear spins can exhibit a rotating and decaying magnetization (nuclear magnetic resonance), which can be detected using a dedicated radio frequency antenna. In order to spatially encode the measurement data, rapidly switched magnetic gradient fields are superposed on the static magnetic field.

[0003] The received nuclear magnetic resonance is usually digitized and stored as complex values in a k-space matrix. This k-space matrix can serve as a basis for reconstructing magnetic resonance images and determining spectroscopy data. Magnetic resonance images are usually reconstructed by means of a multi-dimensional Fourier transform of the k-space matrix.

[0004] In a conventional whole-body scanner, the patient is usually accommodated within a bore or between a pair of magnets when a magnetic resonance measurement is to be performed. This can be unsatisfactory from a cost and / or space utilization point of view, in particular if the examination is limited to a body region of the patient that is significantly smaller than the imaging volume provided by the whole-body scanner. Moreover, patients suffering from claustrophobia and / or children can not be able to endure being located in a confined imaging space for a long time. SUMMARY

[0005] It is therefore an object of the present application to provide a magnetic resonance apparatus with enhanced openness and / or accessibility for imaging dedicated body regions of a patient.

[0006] This object is achieved by a magnetic resonance apparatus according to the present application. Further advantageous embodiments are specified in the dependent aspects of the present application.

[0007] The magnetic resonance apparatus of the present application comprises a field generating unit configured to generate a main magnetic field comprising an imaging volume and a support structure configured to structurally support the field generating unit. The field generating unit comprises a first magnet and a second magnet. The first magnet comprises two magnet segments arranged at an angle to each other to form a triangular half-open space enclosing at least a portion of the imaging volume.

[0008] The first magnet can comprise or consist of a permanent magnet or a permanent magnet array.

[0009] The permanent magnet can comprise a magnetic material such as AlNiCo (Aluminum Nickel Cobalt), NdFeB (Neodymium Iron Boron), SmCo (Samarium Cobalt). The magnet segments of the first magnet can comprise a bar, a cuboid, a cylinder, a prism, etc. shape. A bar-shaped permanent magnet can advantageously provide a low-cost solution for generating a magnetic field. According to one embodiment, the first magnet consists of smaller stacked permanent magnets or a permanent magnet array. The permanent magnet array can represent a Halbach array. The use of permanent magnets can advantageously avoid the costs and space required for cooling equipment typically associated with superconducting magnets and electromagnets.

[0010] According to one embodiment, the first magnet comprises or consists of an electromagnet.

[0011] The electromagnet can represent a non-superconducting magnet. In particular, the electromagnet can comprise an electrical conductor wound around a magnetic core made of, for example, a ferromagnetic material or a ferrimagnetic material. The magnetic core of the electromagnet can comprise a cylinder, a cuboid, a prism, or any other suitable shape. Compared to a permanent magnet of comparable size, the magnetic field strength of the magnetic field provided by the first magnet can increase when an electromagnet is provided. The higher magnetic field strength can advantageously allow to acquire magnetic resonance images with improved image quality and / or signal-to-noise ratio.

[0012] According to another embodiment, the first magnet comprises or consists of a superconducting magnet.

[0013] For example, the first magnet can comprise or consist of a high-temperature superconducting material and / or a low-temperature superconducting material. The superconducting magnet can comprise one or more superconducting wire coils. The superconducting wire can be thermally coupled to a cryogenic cooler configured to maintain the temperature of the superconducting wire below a predetermined value. The one or more superconducting wire coils can be arranged in various shapes such as a solenoid, a substantially planar ring, or a tubular segment. Compared to a permanent magnet or an electromagnet of comparable size, the magnetic field strength of the magnetic field provided by the first magnet can advantageously increase when a superconducting magnet is used.

[0014] According to the above-mentioned embodiments, the second magnet can comprise or consist of a permanent magnet, an electromagnet or a superconducting magnet. In a preferred embodiment, the second magnet consists of a permanent magnet.

[0015] The two magnet segments of the first magnet are arranged in a way that a triangular half-open space is formed. The triangular half-open space can enclose at least a portion of the imaging volume.

[0016] According to one embodiment, the triangular half-open space can be limited in at least one spatial direction, preferably in at least two spatial directions, by the first magnet. For example, the first magnet segment of the first magnet can limit the triangular half-open space in a first spatial direction and the second magnet segment of the first magnet can limit the triangular half-open space in a second spatial direction. It is conceivable that the second magnet limits the triangular half-open space in a third spatial direction. Preferably, the first, second and third spatial directions are different from each other.

[0017] In a preferred embodiment, the triangular half-open space formed between the at least two magnet segments of the first magnet provides an opening for patient access to the imaging volume.

[0018] The angle between the two magnet segments can have a value between 10 degrees and 180 degrees, preferably between 60 degrees and 120 degrees. In particular, the two magnet segments can be arranged in a way that an open triangular or “V” shape is formed. When providing a field generating unit with a triangular or “V” shape, the accessibility of the imaging volume can be advantageously improved compared to conventional magnetic resonance devices while having a minimal impact on the efficiency of the field generating unit.

[0019] The support structure can be configured for maintaining the relative position between the two magnet segments of the first magnet. The support structure can also be configured for maintaining the relative position between the first magnet and the second magnet. In particular, the support structure can be attached to the first and second magnet segments of the first magnet via a form-locking connection, a force-locking connection and / or a material bond. The support structure can be mechanically connected to the second magnet in a similar way. In a preferred embodiment, the support structure is screwed, bolted, clamped and / or glued to the first and second magnets.

[0020] The support structure can comprise or consist of any material capable of withstanding gravitational, electromagnetic and / or mechanical forces exerted on or by the first and / or second magnet of the field generating unit. Typical examples of suitable materials are metals, such as iron, steel or stainless steel, but also metal alloys, ceramics and synthetic or composite materials.

[0021] According to one embodiment, the support structure comprises a yoke. The yoke can enhance, modify and / or limit the magnetic flux density in certain regions of the magnetic resonance apparatus, such as the triangular semi-open space and / or the imaging volume. It is conceivable that the yoke is made of a material having a high magnetic permeability. In particular, the yoke can comprise a large amount of iron and / or other ferromagnetic material. Examples of materials having a high magnetic permeability are metals such as iron, cobalt or nickel and alloys of these metals. The support structure and / or the yoke can be designed to enhance, limit or modify the magnetic field generated by the field generating unit.

[0022] According to another embodiment, the support structure comprises two end plates attached to the two magnet segments of the first magnet. For example, a first end plate can be attached to the first magnet segment of the first magnet and a second end plate can be attached to the second magnet segment of the first magnet. The two end plates can be formed as separate pieces or separate elements attached to the support structure. However, the two end plates and the support structure can form a coherent or integral structure. In one example, the first end plate is attached to the second end plate via a form-locking mechanical connection, a force-locking mechanical connection and / or a material bond.

[0023] The support structure can be configured to mount the field generating unit and / or the magnetic resonance apparatus to a portion of the examination room. For example, the support structure can be configured to mount the first magnet and / or the second magnet to a floor, a wall and / or a ceiling of the examination room.

[0024] The imaging volume can be characterized by a predefined magnetic field direction and / or a predefined magnetic field strength. For example, the imaging volume can comprise a volume having a substantially uniform magnetic field direction and / or a substantially uniform magnetic field strength. The imaging volume can correspond to a homogeneous volume within the magnetic field generated by the field generating unit. In particular, the imaging volume can represent an isocenter of the magnetic resonance apparatus. It is also conceivable that the imaging volume comprises a predefined or static magnetic gradient field. Such a magnetic gradient field can be used to spatially encode magnetic resonance signals acquired from an examination object positioned within the imaging volume.

[0025] According to the present application, the first magnet and the second magnet are arranged on opposite sides of the imaging volume.

[0026] For example, the first magnet and the second magnet can be arranged in a manner that limits the imaging volume from at least two sides and / or from at least two opposite spatial directions. The imaging volume can be arranged at least partially within the triangular semi-open space formed by the two magnet segments of the first magnet. Preferably, the second magnet is arranged outside the triangular semi-open space formed by the two magnet segments of the first magnet.

[0027] According to one embodiment, the field generating unit is configured to provide a small and targeted imaging volume specifically adapted for imaging a specific body region of the patient. The imaging volume of the magnetic resonance apparatus can be significantly smaller than the imaging volume of a conventional magnetic resonance apparatus. For example, the maximum diameter of a sphere having the same volume as the imaging volume (diameter of the spherical volume - DSV) can be less than 25 cm, less than 20 cm, less than 15 cm, less than 10 cm, less than 8 cm, less than 6 cm or less than 5 cm. The minimum diameter of a sphere having the same volume as the imaging volume can be more than 2 cm, or 5 cm, or 8 cm, or 10 cm.

[0028] The imaging volume can comprise a spherical or a non-spherical shape, for example an ellipsoidal shape, a conical shape, a ring shape, a cuboid shape, a star shape or any shape obtained by distorting and / or deforming one of the shapes. In comparison to a conventional magnetic resonance apparatus, the overall size of the magnetic resonance apparatus can advantageously be reduced when providing a field generating unit configured for providing a small and targeted imaging volume.

[0029] In a preferred embodiment, the magnetic resonance apparatus of the present application is configured to acquire magnetic resonance imaging data from an examination object, in particular a patient, positioned within a triangular semi-open space. To this end, the magnetic resonance apparatus can comprise other components typically required for performing a magnetic resonance examination and for processing the acquired magnetic resonance imaging data. In particular, the magnetic resonance apparatus can comprise a control unit configured to control the magnetic resonance apparatus to perform a magnetic resonance measurement and to acquire a magnetic resonance signal from the examination object. The magnetic resonance apparatus can further comprise a processing unit configured to reconstruct a magnetic resonance image based on the acquired magnetic resonance signal. The triangular semi-open space can correspond to an image acquisition region of the magnetic resonance apparatus.

[0030] The magnetic resonance apparatus of the present application can represent a dedicated scanner configured to perform a magnetic resonance imaging examination of one or more specific body regions of a patient. For example, the specific body region can comprise a heart, an eye, a tooth, a plurality of teeth, a mandible, a prostate, etc.

[0031] In comparison to a conventional whole-body magnetic resonance apparatus, the overall size of the magnetic resonance apparatus of the present application can advantageously be reduced when providing a magnetic resonance apparatus of the present application configured for imaging one or more specific body regions of a patient, i.e. a dedicated scanner of the present application. Furthermore, the magnetic resonance apparatus of the present application can be less expensive and / or easier to install in a confined space in comparison to a conventional magnetic resonance apparatus.

[0032] The field generating unit comprises a first magnet and a second magnet arranged at opposite sides of the imaging volume, which can advantageously allow the imaging volume to be moved away from a corner of the triangular half-open space formed by the first magnet. Thus, the accessibility of the imaging volume can be advantageously improved compared to a field generating unit consisting of the first magnet only.

[0033] In particular, the magnetic resonance apparatus of the present application can advantageously allow to examine anatomical regions of a patient which do not fit into a corner of a triangular half-open space. Furthermore, the magnetic resonance apparatus of the present application can advantageously allow to image organ structures located at a deeper site within a patient's body, such as the heart and / or the prostate. Due to the fact that these organ structures are located within the body and a predetermined distance between the imaging volume and a corner of a triangular half-open space, these organ structures can not be examinable in a dedicated scanner comprising a "V"-shaped magnet only.

[0034] According to one embodiment of the magnetic resonance apparatus, the horizontal polarization direction of the second magnet is opposite to the horizontal polarization direction of the first magnet.

[0035] The second magnet can represent a single-sided magnet or a directional magnet.

[0036] The term single-sided magnet can refer to a magnet having a higher magnetic field strength at a first side and a weaker magnetic field strength or substantially no magnetic field at a second side opposite to the first side. For example, the second side of the single-sided magnet can be covered with an iron sheet which provides a shielding effect and / or deflects the magnetic field in a direction towards the first side. Thus, the first side can exhibit a significantly increased magnetic field strength compared to the second side.

[0037] The directional magnet can comprise a first pole and a second pole, the first pole having a higher magnetic field strength compared to the second pole.

[0038] The magnetic field generated by the second magnet can be located mainly or completely on a side of the second magnet facing the imaging volume.

[0039] Preferably, a main direction of magnetic field lines of the magnetic field provided by the first magnet within the triangular half-open space corresponds to a main direction of magnetic field lines of the magnetic field provided by the second magnet on a side of the second magnet facing the imaging volume.

[0040] The field generating unit of the present application comprises a first magnet and a second magnet having opposite horizontal polarization directions, which can advantageously allow to increase the homogeneous volume of the magnetic resonance apparatus and / or to adjust the spatial position of the homogeneous volume. Thus, the magnetic resonance apparatus can allow to image larger objects or larger portions of a patient's body.

[0041] According to another embodiment of the field generating unit of the present application, the support structure is configured for variably changing the spatial position of the second magnet relative to the first magnet.

[0042] For example, the support structure can comprise a first section attached to the first magnet and a second section attached to the second magnet. The first section can be mechanically connected to the second section. However, the first section and the second section can be mechanically unlinked.

[0043] According to an embodiment, the first section is mechanically separated from the second section. In another embodiment, the first section and the second section are mechanically coupled via the support structure.

[0044] The first section can represent a part of the support structure configured to maintain an angle between the two magnet sections of the first magnet. For example, according to the above-mentioned embodiment, the first section can comprise one or more end plates. Preferably, the first section is configured to provide mechanical support to the first magnet and / or to carry the first magnet. The first section can be mechanically connected or attached to the first magnet.

[0045] The second section can be configured to provide mechanical support to the second magnet and / or to carry the second magnet. In particular, the second section can be mechanically connected or attached to the second magnet.

[0046] According to one embodiment, the first section and the second section are mechanically connected. For example, the first section can be directly attached to the second section. When the first section is attached to the second section, the risk of movement of the second section relative to the first section can be reduced. Thus, a reduction of the magnetic homogeneity within the imaging volume due to a relative movement between the first magnet and the second magnet can advantageously be avoided.

[0047] However, the first section can also be mechanically coupled to the second section. For example, the first section can be attached to a third section of the support structure which is connected to the second section. In other words, the first section can be separated from the second section via the third section. The third section can comprise a static support element, such as a rod, a beam, a strut or any other suitable support element. However, the third section can also comprise a dynamic support element, in particular an adjustment unit according to the following embodiment. When allowing the second magnet to move relative to the first magnet, the accessibility to the imaging volume can advantageously be facilitated.

[0048] According to a preferred embodiment of the magnetic resonance apparatus of the present application, the first section is mechanically coupled to the second section and the support structure comprises an adjustment unit configured to variably change a relative position between the first section and the second section.

[0049] The adjustment unit or adjustment mechanism can be configured to variably change the spatial position of the second magnet relative to the first magnet. For example, the adjustment unit can comprise a movable joint, such as a hinge, a pivot or a swivel. The movable joint can be configured to enable the second magnet to be guided along a predetermined motion trajectory relative to the first magnet. For example, the predetermined motion trajectory can correspond to a segment of an elliptical arc or a segment of a circular arc.

[0050] According to one embodiment, the adjustment unit comprises a first part attached to the first section of the support structure and a second part attached to the second section of the support structure. The adjustment unit can comprise any suitable form of movable joint configured to allow relative motion of the second magnet relative to the first magnet.

[0051] The movable joint, in particular the hinge or swivel, can represent a particularly economic and efficient embodiment of the adjustment unit. Furthermore, the hinge or swivel can advantageously limit the motion of the second magnet to a predetermined motion trajectory. Thus, undesired misalignment between the first magnet and the second magnet can advantageously be avoided.

[0052] According to one embodiment of the magnetic resonance apparatus according to the application, the adjustment unit comprises a guide mechanism.

[0053] The guide mechanism can comprise a track or a sliding mechanism. In particular, the guide mechanism can comprise a guide element defining a substantially linear motion trajectory of the second magnet. For example, the guide element can comprise or consist of one or more rods, bars, tracks, bearings or the like.

[0054] According to one embodiment, the second section of the support structure can comprise or form a slider or skid configured to slide along the guide element. According to the embodiments described herein, the guide mechanism and / or the guide element can correspond to the third section.

[0055] The guide mechanism can advantageously enable the second magnet to be variably moved relative to the first magnet. Thus, patient access to the triangular semi-open space can be facilitated. Furthermore, the guide mechanism can advantageously provide improved mechanical support to the second magnet along the motion trajectory defined by the guide element.

[0056] It is conceivable that the adjustment unit comprises a drive or motor configured to variably move the second magnet relative to the first magnet. In certain embodiments, the adjustment unit can be mechanically connected or mechanically coupled to the first magnet and the first section of the support structure. However, the adjustment unit can also be mechanically decoupled from the first magnet and the first section of the support structure. For example, the adjustment unit can be carried by the second section of the support structure, which is mechanically decoupled from the first section and configured to carry and / or mount the second magnet to the floor, walls and / or ceiling of the examination room.

[0057] In a preferred embodiment, the adjustment unit is configured to automatically adjust the spatial position of the second magnet relative to the first magnet in dependence of a control signal. For example, the adjustment unit can comprise a motor or a drive configured to receive a control signal provided via a control unit of the magnetic resonance apparatus of the present application.

[0058] In providing an adjustment unit configured to automatically adjust the spatial position of the second magnet relative to the first magnet, the first magnet and the second magnet can advantageously be arranged in one or more desired spatial arrangements in a time-efficient and / or reproducible manner.

[0059] According to one embodiment, the magnetic resonance apparatus of the present application comprises a stop element configured to constrain or limit the movement of the second magnet along the movement trajectory defined by the adjustment unit.

[0060] The stop element can be configured to prevent the movement of the second magnet along the movement trajectory beyond a predetermined spatial position. For example, according to one embodiment described below, the stop element can be configured to prevent the movement of the second magnet past the measurement position and / or past the open position.

[0061] The stop element can comprise a suitable mechanism configured to limit the movement of the second magnet along the movement trajectory. For example, the stop element can comprise a locking element, such as a bolt, a block, a plate or an anchor. The stop element can further comprise a holding element, a damping element or the like. It is conceivable that the stop element is mechanically connected to the support structure and / or the adjustment unit, in particular to the guide element.

[0062] The stop element can advantageously allow the movement of the second magnet between predetermined spatial positions defined by the stop element. Thus, the second magnet can advantageously be moved to a desired spatial position in a time-efficient manner. Furthermore, the stop element can advantageously prevent the arrangement of the second magnet in an undesired spatial position and / or prevent the second magnet from harming a patient accommodated within the triangular half-open space.

[0063] According to a preferred embodiment of the magnetic resonance apparatus of the present application, the support structure is configured to arrange the second magnet in the open position and in the measurement position.

[0064] Preferably, the support structure comprises an adjustment unit configured to arrange the second magnet in the open position and in the measurement position. The adjustment unit can be implemented according to the above-described embodiments.

[0065] The open position can be characterized by a relative spatial arrangement of the second magnet with respect to the first magnet which allows a patient to enter the triangular half-open space. In particular, the open position can characterize a spatial arrangement of the field generating unit which avoids an obstruction of the opening of the triangular half-open space by the second magnet. For example, the second magnet can be arranged at a predetermined distance from the opening of the triangular half-open space. It is also conceivable that the second magnet is arranged off-axis and / or at an angle with respect to the first magnet when arranged in the open position.

[0066] The measurement position can be characterized by a relative spatial arrangement of the second magnet with respect to the first magnet, wherein the magnetic field provided by the first magnet and the magnetic field provided by the second magnet at least partially overlap within the triangular half-open space. It is also conceivable that the measurement position characterizes a spatial position of the second magnet with respect to the first magnet which allows the magnetic field of the first magnet and the magnetic field of the second magnet to interact and / or to form a common or shared homogeneous volume or imaging volume which is at least partially arranged within the triangular half-open space. In particular, the measurement position can be characterized by the second magnet being arranged around the opening of the triangular half-open space. For example, the second magnet can obstruct or hinder the opening of the triangular half-open space when arranged in the measurement position. The measurement position can also be characterized by a non-empty intersection of a projection of the cross-sectional area of the opening of the triangular half-open space along a symmetry plane of the first magnet, in particular a symmetry plane which bisects the two magnet sections, e.g. a symmetry plane corresponding to the Y-direction of the magnetic resonance device, with the second magnet.

[0067] When providing a support structure configured to arrange the second magnet in the open position, the accessibility of the imaging volume can advantageously be improved. Compared to a magnetic resonance device comprising a single-sided magnet or a field generating unit constituted only by the first magnet, the second magnet arranged in the measurement position can advantageously allow to provide a higher magnetic field strength and / or an increased homogeneous volume.

[0068] According to one embodiment of the magnetic resonance device of the present invention, the field generating unit is configured such that a spatial position of the imaging volume changes when a spatial position of the second magnet changes with respect to the first magnet.

[0069] The movement of the second magnet from the open position to the measurement position can cause a change in the shape, size and / or spatial position of the imaging volume within the triangular half-open space. In particular, the movement of the second magnet between the open position and the measurement position can cause a change in the spatial position of the geometric center of the imaging volume.

[0070] By variably moving the second magnet relative to the first magnet, the interaction and / or overlap between the magnetic field generated by the first magnet and the magnetic field generated by the second magnet can be changed. Thus, depending on the spatial position of the second magnet relative to the first magnet, the imaging volume can comprise different shapes, different sizes and / or different spatial positions.

[0071] In providing a predetermined movement trajectory of the second magnet relative to the first magnet, the characteristics of the imaging volume provided via the field generating unit can be changed to accommodate different body sizes of patients and / or different body regions.

[0072] The field generating unit of the present application can advantageously allow to adjust the shape, size and / or spatial position of the homogeneous volume depending on the body region of the subject, in particular of the patient, to be examined.

[0073] In a preferred embodiment of the magnetic resonance apparatus of the present application, the field generating unit is configured such that the imaging volume moves away from the corner of the triangular half-open space when the second magnet is moved from the open position to the measurement position.

[0074] The field generating unit can be configured such that the imaging volume moves towards the opening of the triangular half-open space when the second magnet is moved from the open position to the measurement position.

[0075] Preferably, the field generating unit is configured such that the imaging volume at least partially moves out of the triangular half-open space towards the opening of the triangular half-open space when the second magnet is moved from the open position to the measurement position.

[0076] The magnetic resonance apparatus of the present application can advantageously allow to image body parts of subjects or patients whose external dimensions exceed the available space in the vicinity of the corner of the triangular half-open space. Furthermore, by moving the imaging volume away from the corner of the first magnet, the accessibility to the imaging volume can be improved. Thus, imaging examinations of disabled patients or obese patients can be advantageously facilitated.

[0077] According to one embodiment of the magnetic resonance apparatus of the present application, the support structure is configured to arrange the second magnet in a first measurement position and in a second measurement position. The spatial position of the second magnet at the first measurement position is different from the spatial position of the second magnet at the second measurement position.

[0078] The support structure can be configured to arrange the second magnet in a plurality of measurement positions. At each measurement position of the plurality of measurement positions, the second magnet can be arranged in a different spatial position relative to the first magnet.

[0079] It is conceivable that the shape, the size and / or the spatial position of the imaging volume provided by the field generating unit is different at each measurement position. In particular, each measurement position can provide an imaging volume having a predetermined shape and / or a predetermined spatial position with respect to the volume defined by the triangular half-open space.

[0080] The magnetic resonance apparatus of the present application can advantageously allow to select the measurement position depending on the body region of the patient to be imaged. Thus, the positioning of the patient for the magnetic resonance measurement can be facilitated and / or the number of body regions which can be examined by the magnetic resonance apparatus of the present application can advantageously be increased.

[0081] According to one embodiment, the magnetic resonance apparatus of the present application comprises a radio frequency system comprising at least one radio frequency antenna configured to transmit and / or receive radio frequency radiation.

[0082] The radio frequency system can comprise one or more radio frequency antennas configured to transmit radio frequency excitation pulses and / or to receive magnetic resonance signals. Preferably, the radio frequency system comprises at least two radio frequency antennas. The at least two radio frequency antennas can be arranged at two opposite sides of the field generating unit, in particular at the two separate segments of the first magnet. For example, a first radio frequency antenna can be attached to a first magnet segment of the first magnet and a second radio frequency antenna can be attached to a second magnet segment of the first magnet. It is also conceivable that the at least one radio frequency antenna is carried by and / or attached to the support structure and / or the second magnet.

[0083] According to one embodiment, the radio frequency system is designed to match the contour and / or the surface of the object to be imaged. Thus, the distance between the at least one radio frequency antenna and the surface of the imaging object can advantageously be reduced. However, the at least one radio frequency antenna can also be shaped to match the surface of the first magnet and / or the second magnet pointing into the imaging volume.

[0084] According to another embodiment, the magnetic resonance apparatus of the present application comprises a gradient field system comprising at least one gradient coil configured to generate at least one magnetic gradient field.

[0085] The gradient field system can comprise one or more gradient coils configured to produce a magnetic gradient field along an x-direction, a y-direction and / or a z-direction. In one embodiment, the at least one gradient coil can comprise coil wires configured to produce a magnetic field upon application of an electric current. It is conceivable that the gradient field system is carried by the support structure, the first magnet and / or the second magnet. For example, the at least one gradient coil can form a layer on the first magnet section and / or the second magnet section of the first magnet. In particular, the at least one gradient coil can be at least partially recessed into a surface or pole face of the first magnet, e.g. of the first magnet section and / or the second magnet section. Envisageable values for the maximum gradient field strength provided by the gradient field system can be between 10 mT / m and 30 mT / m, and the slew rate can be between 10 T / m / s and 30 T / m / s. However, it is also possible to exceed this range upwards or downwards depending on the specific case. BRIEF DESCRIPTION OF DRAWINGS

[0086] Further advantages and details of the present application can be gathered from the embodiments described below as well as from the attached drawings. The drawings show:

[0087] Figure 1 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0088] Figure 2 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0089] Figure 3 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0090] Figure 4 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0091] Figure 5 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0092] Figure 6 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0093] Figure 7 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application;

[0094] Figure 8 is a schematic view of an embodiment of a magnetic resonance apparatus of the present application. DETAILED DESCRIPTION

[0095] Figure 1A schematic view of a magnetic resonance apparatus 10 of the present invention is depicted, which is configured to perform a magnetic resonance imaging examination of a head region, in particular of a mandible region or of an eye region, of a patient 15. However, the application of the magnetic resonance apparatus 10 for imaging a head region of a patient 15 is to be understood as an example. The magnetic resonance apparatus 10 of the present invention can also be configured to perform each of the following:

[0096] • cardiac imaging of a heart;

[0097] • mammography imaging;

[0098] • neuroimaging of a brain and / or of a spinal column;

[0099] • orthopedic imaging of a joint (e.g. knee, shoulder, elbow);

[0100] • ophthalmic imaging of an eye, of an optic nerve and / or of related anatomical structures;

[0101] • dental imaging of a mandible and / or of one or more teeth (preferably supported via a dedicated intraoral or extraoral radio frequency antenna);

[0102] • urological imaging of a prostate (e.g. by orienting the field generating unit 12 such that the patient 15 can be accommodated in the triangular semi-open space 47 in a sitting position); or

[0103] • imaging of other body regions of the patient 15 (e.g. by using a dedicated radio frequency antenna 32).

[0104] The field generating unit 12 of the magnetic resonance apparatus 10 can comprise a positioning unit 13 configured to position and / or orient the field generating unit 12 in dependence on a diagnostically relevant body region of the patient 15 (see Figure 2 ). The positioning unit 13 can carry the support structure 11 and / or be attached to the support structure 11.

[0105] The magnetic resonance apparatus 10 of the present invention can be used for veterinary care to visualize a body region of an animal, e.g. a limb of a large animal such as a horse or a cow. The opening 48 of the triangular semi-open space 47 comprising the imaging volume 30 can be oriented to accommodate an animal and / or to facilitate imaging of an animal (e.g. a cat, a dog, a hamster, etc.).

[0106] Figure 1 The depicted magnetic resonance apparatus 10 of the present invention comprises a field generating unit 12. The field generating unit 12 comprises a magnet 14 having a first magnet section 14a and a second magnet section 14b and a magnet 18.

[0107] The first magnet segment 14a and the second magnet segment 14b are supported by a support structure 11 configured to maintain a predetermined spatial arrangement of the first magnet segment 14a and the second magnet segment 14b. The support structure 11 may include or be composed of a yoke. In some embodiments, the support structure 11, the magnet 14, and the magnet 18 form a continuous structure. However, the support structure 11 may also include an adjustment unit 50 configured to move the magnet 18 relative to the magnet 14 (see [link to relevant documentation]). Figures 4 to 7 ).

[0108] exist Figure 1 In the depicted embodiment, the support structure 11 includes two end plates 45a and 45b arranged at an angle greater than 0 degrees and less than 180 degrees. The angle between end plates 45a and 45b can be in the range of 30 degrees to 150 degrees, preferably in the range of 40 degrees to 60 degrees, 60 degrees to 80 degrees, 80 degrees to 100 degrees, or 100 degrees to 120 degrees. Preferably, the angle between end plates 45a and 45b corresponds to the angle between the first magnet segment 14a and the second magnet segment 14b. In one embodiment, the angle between the first magnet segment 14a and the second magnet segment 14b is substantially 90 degrees. However, the angle between the first magnet segment 14a and the second magnet segment 14b can also be less than 90 degrees or more than 90 degrees. Figure 1 In the depicted cross-sectional view, the field generating unit 12 has an "L" or "V" shape. However, the field generating unit 12 may also include rounded corners 41, which are "U" shaped in the cross-sectional view.

[0109] The width of the opening 48 of the triangular semi-open space 47 can exceed 60cm, 80cm, 100cm, 120cm or 140cm, thereby providing sufficient clearance so that the patient 15 can approach the imaging volume 30.

[0110] exist Figure 1 In the depicted example, the triangular semi-open space 47 includes a corner 41 or angle, at which end plates 45a and 45b are connected and / or attached to each other. The field generating unit 12, particularly the magnet 18, is arranged as follows: Figure 1 In the open position shown, the imaging volume 30 can be located at or near the corner 41 of the triangular semi-open space 47. When the field generating unit 12 and / or the magnet 18 are arranged in the measurement position (see...),... Figures 4 to 6 The imaging volume 30 can move away from the corner 41 toward the opening 48 of the triangular semi-open space.

[0111] The free volume between the first magnet segment 14a and the second magnet segment 14b can represent an image acquisition region 17 which is configured to receive a body region of an examination object 15, e.g. a patient 15. In Figure 1 In the depicted example, the imaging volume 30 is positioned within the image acquisition region 17 and is limited in two spatial directions by the first magnet 14. The second magnet 18 can limit the imaging volume 30 in a third spatial direction. The image acquisition region 17 can correspond to a triangular half-open space 47 formed by the first magnet segment 14a and the second magnet segment 14b.

[0112] The field generating unit 12 is configured to generate a magnetic field in the image acquisition region 17. In Figure 1 In the shown example, the field generating unit 12 comprises a gradient field system 27 comprising at least one gradient coil 28 (see Figure 6 and Figure 7 ) configured to generate a magnetic gradient field within the image acquisition region 17. The magnetic gradient field can be used for spatially encoding magnetic resonance signals acquired during a magnetic resonance imaging examination.

[0113] In a preferred embodiment, the field generating unit 12 further comprises a radio frequency system 29 comprising at least one radio frequency antenna 32 (see Figure 6 and Figure 7 ) configured to emit radio frequency excitation pulses to the image acquisition region 17. The at least one radio frequency antenna 32 can be configured to receive magnetic resonance signals from the image acquisition region 17, in particular the imaging volume 30. According to one embodiment, the at least one radio frequency antenna 32 is embodied as a local coil (not shown) configured to be arranged in the vicinity of a diagnostically relevant body region of the patient 15.

[0114] In Figure 1 In the depicted embodiment, the magnetic resonance apparatus 10 comprises a control unit 20 configured to control the field generating unit 12, the gradient field system 27 and the radio frequency system 29. For example, the control unit 20 can be configured to control a gradient control unit 21 electrically connected to the gradient field system 27 and a radio frequency control unit 22 electrically connected to the radio frequency system 29. It is also conceivable that the gradient control unit 21 and the radio frequency control unit 22 are integrated within the control unit 20. In a preferred embodiment, the control unit 20 is configured to control the magnetic resonance apparatus 10 to perform an imaging examination of the patient 15 arranged within the image acquisition region 17.

[0115] The control unit 20 can comprise a processing unit 24 configured to coordinate acquisition of magnetic resonance data and / or reconstruction of magnetic resonance images based on the magnetic resonance data acquired from the imaging volume 30. It is conceivable that the processing unit 24 is configured to evaluate and process data, such as acquired magnetic resonance signals or magnetic resonance data, as well as imaging parameters and / or imaging protocols of imaging sequences. The control unit 20 can comprise a controller, a microcontroller, an analog circuit, a logic unit, etc. The processing unit 24 can comprise a processor, such as a CPU, a GPU, etc. It is also conceivable that the control unit 20 and / or the processing unit 24 comprise a memory and / or an internal memory, such as a RAM, a ROM, a PROM, an EPROM, an EEPROM, a flash memory, as well as a HDD, a SSD, etc.

[0116] The magnetic resonance apparatus 10 can comprise an output unit 25 configured to output or display control information, such as imaging parameters and / or magnetic resonance data. Preferably, the output unit 25 comprises at least one monitor configured to display control information as well as magnetic resonance data and / or magnetic resonance images acquired via the magnetic resonance apparatus 10 to an operator of the magnetic resonance apparatus 10. The magnetic resonance apparatus 10 can further comprise an input unit 26 configured to receive information and / or parameters input by the operator during an imaging examination.

[0117] It is conceivable that the magnetic resonance apparatus 10 comprises a cover or a pad (not shown) arranged between the patient 15 and the field generating unit 12. The cover or pad can be configured to protect the patient 15 from electric currents and / or to improve comfort during an imaging examination.

[0118] The field generating unit 12 can comprise or contain one or more permanent magnets (e.g. ferromagnets), pole elements (e.g. inductive magnets such as iron or other ferromagnetic material) and / or magnet coils (e.g. based on resistive wires and / or superconducting wires). The field generating unit 12 can further comprise a magnet array with a uniform or varying magnetic field strength and magnetic field orientation. According to one embodiment, the field generating unit 12 comprises one or more planar coils and / or coils with a predetermined curvature in the winding plane.

[0119] Of course, the magnetic resonance apparatus 10 can comprise further components and / or functions as common in magnetic resonance apparatuses. The general operation of the magnetic resonance apparatus 10 is known to the person skilled in the art, so that a more detailed description is omitted.

[0120] Figure 2An embodiment of the magnetic resonance apparatus 10 of the present application is shown which comprises a positioning unit 13 configured for adjusting a position and / or an orientation of the field generating unit 12 relative to the patient 15. For example, the positioning unit 13 can comprise a rotary joint configured to rotate the field generating unit 12 about the X-axis and / or the Y-axis. The positioning unit 13 can comprise a telescopic system and / or a rail which is mechanically connected to the support structure 11 and configured to adjust a position of the field generating unit 12 along the Y-direction and / or the Z-direction. In another example, the positioning unit 13 is configured to adjust a position of the field generating unit 12 along the X-direction and / or to rotate the field generating unit 12 about the Z-direction.

[0121] Figure 3 A schematic diagram of an embodiment of the magnetic resonance apparatus 10 of the present application is shown. In the depicted example, the horizontal polarization direction of the magnet 18 is oriented opposite to the average horizontal polarization direction of the magnets 14. For example, the polarization direction of the magnet 14a and the polarization direction of the magnet 14b are perpendicular to the surfaces of the magnets 14a and 14b facing the magnet 18, but the directions are opposite (as indicated by arrows 60a and 60b). However, the polarization directions can deviate from an orientation perpendicular to these surfaces. The vector sum of the two polarization directions, or the average horizontal polarization direction of the magnets 14, will preferably be opposite to the polarization direction of the magnet 18.

[0122] As indicated by arrows 60a, 60b and 60c, the main direction of the magnetic field lines of the magnetic field generated by the magnets 14 within the triangular half-open space 47 substantially corresponds to the main direction of the magnetic field lines of the magnetic field generated by the magnet 18 within the triangular half-open space 47.

[0123] In Figure 3 the magnet 18 is implemented as a single-sided magnet or a directed magnet configured to generate a magnetic field on the side of the magnet 18 facing the first magnets 14. The magnet 18 exhibits an opposite horizontal polarization direction relative to the (average) horizontal polarization direction of the magnets 14. Thus, the main directions 61 of the magnetic field lines of the magnetic fields provided by the magnets 14 and 18 within the imaging volume 30 generally correspond to each other.

[0124] Figure 4 A schematic diagram of an embodiment of the magnetic resonance apparatus 10 of the present application is depicted which comprises a support structure 11 comprising a first section 11a attached to the magnets 14 and a second section 11b attached to the magnet 18. The first section 11a and the second section 11b can be mechanically connected or coupled via a third section 11c. However, the third section 11c can also form part of the first section 11a and / or the second section 11b.

[0125] According to one embodiment, the support structure 11 is configured to maintain the relative spatial arrangement of the magnet 14 and the magnet 18. For example, the support structure 11 can be configured to prevent relative motion between the magnet 14 and the magnet 18. In particular, the adjustment unit 50 as shown in Figure 4 may be omitted. For example, the support structure 11 can represent a static structure configured to maintain the magnet 18 in a predetermined relative position with respect to the magnet 14.

[0126] In a preferred embodiment, the support structure 11 comprises an adjustment unit 50 (cf. Figures 4 to 7 ), which is configured to variably adjust the position of the magnet 18 with respect to the magnet 14. In particular, the adjustment unit 50 can be configured to variably change the relative position between the first section 11a and the second section 11b. With reference to the depicted example, the adjustment unit 50 can be configured to variably move the second section 11b along the Y-direction to increase or decrease the distance between the magnet 14 and the magnet 18. Figure 4

[0127] In the embodiment as shown in Figure 4 , the magnet 18 is arranged in a measurement position. The gap between the magnet 14 and the magnet 18 can be sufficient to enable a patient to enter a triangular half-open space 47 comprising the imaging volume 30. In one example, the patient can enter the triangular half-open space 47 along the X-direction. In a preferred embodiment, the adjustment unit 50 is configured to move the magnet 18 away from the magnet 14 and to arrange the magnet 18 in an open position, thereby facilitating the entry into the triangular half-open space 47.

[0128] Figure 5 Another embodiment of the magnetic resonance apparatus 10 of the present application is depicted. In the depicted example, the support structure 11 comprises a first section 11a attached to the magnet 14 and a second section 11b attached to the magnet 18. The first section 11a and the second section 11b are mechanically separated or unlinked.

[0129] For example, the first section 11a can be mechanically connected to the floor 70 of the examination room, while the second section 11b can be mechanically connected to the wall and / or the ceiling 71 of the examination room.

[0130] The support structure 11 can be a static structure configured to permanently arrange the magnet 18 in a measurement position. However, in a preferred embodiment, the support structure 11 comprises an adjustment unit 50 configured to variably change the relative position between the first section 11a and the second section 11b. In particular, the adjustment unit 50 can be configured to move the magnet 18 along the Y-direction towards or away from the magnet 14.

[0131] Figure 6 ​An embodiment of the magnetic resonance apparatus 10 of the present application is shown, which is configured as a chair. In the depicted example, the magnetic resonance apparatus 10 is mounted to the floor 70 of an examination room via a support structure 11. A first section 11a of the support structure 11 provides mechanical support to the magnet sections 14a, 14b forming a triangular semi-open space 47.

[0132] The support structure 11 comprises an adjustment unit 50, which is configured as a pivot or swivel. The adjustment unit 50 comprises a compression spring or air ram 50a, which is configured to rotate a second section 11b carrying the magnet 18 around the pivot 50. The control unit 20 of the magnetic resonance apparatus 10 can be configured to control the air ram 50a to move the magnet 18 in an automated manner between a measurement position and an open position. In the depicted example, the magnet 18 is arranged in the open position to allow a patient to enter the triangular semi-open space 47, in particular to allow the patient to sit on the magnet 14. The arrow 60 indicates the trajectory of movement of the magnet 18 from the open position to the measurement position and vice versa.

[0133] The magnetic resonance apparatus 10 can comprise a stop element 51, which is configured to constrain or limit the movement of the magnet 18 along the trajectory of movement 60. In the depicted example, the stop element 51 is configured to prevent the magnet 18 from moving beyond the measurement position. Figure 6 In the depicted embodiment, the magnetic resonance apparatus 10 comprises a lock 51b configured to mechanically engage with a tubular section 51a of the second section 11b. The lock 51b is attached to the support structure 11 via a dedicated support element, which is configured to prevent the magnet 18 from moving beyond the measurement position, thereby possibly injuring a patient 15 accommodated within the triangular semi-open space 47.

[0134] In a preferred embodiment, the field generating unit 12 is configured such that the spatial position of the imaging volume 30 provided via the magnet 14 and the magnet 18 corresponds to the spatial position of the prostate of a patient 15 sitting on the magnet 14 in the intended position when the magnet 18 is arranged in the measurement position.

[0135] In a preferred embodiment, the magnetic resonance apparatus 10 is configured to perform a magnetic resonance imaging of the prostate of a patient 15 sitting on the magnet 14 in the intended position. Figure 6In the depicted example, the magnetic resonance apparatus 10 comprises a gradient field system 27 comprising at least one gradient coil 28a arranged adjacent to the magnet 14 and at least one gradient coil 28b arranged adjacent to the magnet 18. Further, the magnetic resonance apparatus comprises a radio frequency system 29 comprising at least one radio frequency antenna 32a arranged adjacent to the gradient coil 28a and at least one radio frequency coil 32b arranged adjacent to the gradient coil 28b. When the gradient coils 28 of the gradient field system 27 and the radio frequency antennas 32 of the radio frequency system 29 are distributed over the magnet 14 and the magnet 18, the coverage of an object positioned within the imaging volume 30 can be increased. Thus, the quality of the magnetic resonance image data acquired via the magnetic resonance apparatus 10 can be advantageously improved. In the depicted embodiment, the gradient system 27 comprises a gradient coil line 27a configured to electrically connect the gradient coils 28a, 28b to the gradient control unit 21 (cf. Figure 1 ).

[0136] According to an embodiment, the field generating unit 12 and / or a part of the support structure 11 is equipped with soft padding or cushioning to improve the comfort of the patient 15 accommodated within the triangular semi-open space 47.

[0137] Figure 7 Another embodiment of the inventive magnetic resonance apparatus 10 is shown, which is configured as a chair or a sofa. According to Figure 6 In the depicted embodiment, the magnetic resonance apparatus 10 is mounted to the floor 70 of an examination room via the support structure 11. The first section 11a of the support structure 11 provides mechanical support to the magnet sections 14a, 14b forming the triangular semi-open space 47.

[0138] In the depicted embodiment, the support structure 11 comprises a third section 11c mechanically coupled to an adjustment unit 50. The adjustment unit 50 is configured to move the magnet 18 along a substantially linear motion trajectory indicated by the arrow 60 between a measurement position and an open position.

[0139] The adjustment unit 50 can comprise a rod 50b serving as a guide element and a bearing 50a allowing the magnet 18 and the rod 50b to move along the X-direction.

[0140] The support element 11 can further comprise a support element 11d limiting the magnet 14 in the X-direction. The support element 11d can provide a stop element configured to prevent the magnet 18 from moving beyond the measurement position. Preferably, the support element 11d comprises a receiving portion 11e configured to accommodate an end section of the guide element 50b when the magnet 18 is moved to the measurement position.

[0141] In an alternative embodiment, the guide element or rod 50b may be permanently housed within the receiving portion 11e, and the second segment 11b carrying the magnet 18 may be configured to slide along the rod 50b in the X direction. For example, the second segment 11b may include a bearing that allows the second segment 11b and the magnet 18 to slide along the guide element 50b.

[0142] according to Figure 6 In the depicted embodiment, the gradient field system 27 includes at least one gradient coil 28a arranged adjacent to the magnet 14 and at least one gradient coil 28b arranged adjacent to the magnet 18. The gradient coils 28 of the gradient system 27 may be arranged on the surfaces of the magnet 14 and / or the magnet 18 facing the imaging volume 30. It is also contemplated that the gradient coils 28 are housed within recesses in the surfaces of the magnet 14 and / or the magnet 18 facing the imaging volume 30. The gradient system 27 may include a gradient coil line 27a electrically connecting the gradient coils 28a and 28b to the gradient control unit 21 (see...). Figure 1 ).

[0143] exist Figure 7 In the embodiment shown, the magnetic resonance device 10 includes a radio frequency system 29, which includes at least one radio frequency antenna 32a arranged adjacent to the gradient coil 28a and at least one radio frequency coil 32b arranged adjacent to the gradient coil 28b.

[0144] In some embodiments, one or more gradient coils 28 may be arranged adjacent to magnet 14 and / or magnet 18. Similarly, one or more radio frequency coils 32 may be arranged adjacent to magnet 14 and / or magnet 18.

[0145] In a preferred embodiment, the support structure 11 of the magnetic resonance device 10 includes a yoke attached to the magnet 14. This yoke can be configured to modify and / or shape the magnetic field generated by the field generation unit 12. Conversely, the yoke is conceivably positioned on the side of the field generation unit 12 facing away from the triangular semi-open space 47, thereby ensuring optimal proximity to the imaging volume 30. The yoke may correspond to the first segment 11a of the support structure 11, such as... Figure 6 and Figure 7 As shown. However, the yoke can also be mechanically connected to the magnet 18 of the field generating unit 12.

[0146] According to embodiments, the support structure 11 or parts of the support structure 11 are movable and can be opened and / or tilted to facilitate access to the imaging volume 30. For example, the support structure 11 can comprise hinges or other forms of movable joints configured to change the angle and / or relative position between the end plates 45a, 45b and / or the magnet segments 14a, 14b. Such adjustments can facilitate access to the triangular semi-open space 47 and / or allow to modify the shape and / or spatial position of the imaging volume 30 provided by the field generating unit 12 to match the position of a particular imaging subject.

[0147] Figure 8 A preferred embodiment of the magnetic resonance apparatus 10 of the present application is shown. In the depicted example, the magnetic resonance apparatus 10 is configured as a dedicated scanner for imaging the prostate of a patient 15. According to Figure 6 and Figure 7 The depicted embodiment, the field generating unit 12 is formed like a chair, allowing the patient 15 to be accommodated in a sitting position within the triangular semi-open space 47. In particular, the field generating unit 12 can be configured such that the spatial position of the imaging volume 30 corresponds to the spatial position of the prostate of the patient 15 accommodated within the triangular semi-open space 47.

[0148] The magnetic resonance apparatus 10 can comprise a dedicated patient support 16 configured to support one or more body regions of the patient 15, such as the head or the feet, during the magnetic resonance measurement.

[0149] The embodiments described herein are to be considered as examples. It is understood that the individual embodiments can be extended by or combined with features of other embodiments, if not stated otherwise. Figures 1 to 8 The embodiments depicted in the figures are not necessarily drawn to scale.

Claims

1. A magnetic resonance device (10) comprising a field generating unit (12) and a support structure (11), the field generating unit (12) being configured to generate a main magnetic field including an imaging volume (30), and the support structure (11) being configured to structurally support the field generating unit (12). wherein The field generating unit (12) includes a first magnet (14) and a second magnet (18), wherein the first magnet (14) includes two magnet segments (14a, 14b) arranged at an angle to each other to form a triangular semi-open space (47), the triangular semi-open space (47) surrounding at least a portion of the imaging volume (30). Furthermore, the first magnet (14) and the second magnet (18) are arranged on opposite sides of the imaging volume (18).

2. The magnetic resonance apparatus (10) as claimed in claim 1, wherein The horizontal polarization direction of the second magnet (18) is opposite to that of the first magnet (14).

3. The magnetic resonance apparatus (10) as claimed in claim 1 or claim 2, wherein, The support structure (11) is configured to variably change the spatial position of the second magnet (18) relative to the first magnet (14).

4. The magnetic resonance apparatus (10) as claimed in claim 3, wherein The support structure (11) is configured to arrange the second magnet (18) in the open position and the measuring position.

5. The magnetic resonance apparatus (10) as claimed in claim 4, wherein The field generating unit (12) is configured such that when the second magnet (18) moves from the open position to the measurement position, the imaging volume (30) moves away from the corner (41) of the triangular semi-open space (47).

6. The magnetic resonance apparatus (10) as claimed in one of claims 3 to 5, wherein The field generating unit (12) is configured such that when the spatial position of the second magnet (18) changes relative to the first magnet (14), the spatial position of the imaging volume (30) changes.

7. The magnetic resonance apparatus (10) as claimed in one of claims 3 to 6, wherein The support structure (11) includes a first segment (11a) attached to the first magnet (14) and a second segment (11b) attached to the second magnet (18), wherein the first segment (11a) is mechanically connected to the second segment (11b) or wherein the first segment (11a) and the second segment (11b) are not mechanically connected.

8. The magnetic resonance apparatus (10) as claimed in claim 7, wherein The first segment (11a) is mechanically connected to the second segment (11b), and wherein the support structure (11) includes an adjustment unit (50) configured to variably change the relative position between the first segment (11a) and the second segment (11b).

9. The magnetic resonance device (10) according to claim 8, wherein, The adjustment unit (50) includes a movable connector.

10. The magnetic resonance apparatus (10) according to any one of claims 8 or 9, wherein, The adjustment unit (50) includes a guide mechanism.

11. The magnetic resonance device (10) according to any one of claims 8 to 10, comprising a stop element (51) configured to restrict the movement of the second magnet (18) along a motion trajectory (60) defined by the adjustment unit (50).

12. The magnetic resonance apparatus (10) according to any one of claims 3 to 11, wherein, The support structure (11) is configured to arrange the second magnet (18) at a first measurement position and a second measurement position, wherein the spatial position of the second magnet (18) at the first measurement position is different from the spatial position of the second magnet (18) at the second measurement position.

13. The magnetic resonance apparatus (10) according to any one of the preceding claims, comprising a radio frequency system (29), the radio frequency system (29) including at least one radio frequency antenna (32) configured to transmit and / or receive radio frequency radiation.

14. The magnetic resonance apparatus (10) according to any one of the preceding claims, comprising a gradient field system (27) including at least one gradient coil (28) configured to generate at least one magnetic gradient field.

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