Method for determining consistency information for a local coil

Abstract

The invention relates to a method for determining consistency information for a local coil of a magnetic resonance imaging (MRI) device. The MRI device is designed to acquire medical image data of a predetermined body region of a patient by means of an imaging examination using the local coil. The method comprises acquiring measurement information of the local coil. The measurement information includes the actual position of the local coil. The method comprises determining positioning information. The positioning information includes a target position of the local coil. The method comprises comparing the measurement information with the positioning information. The method comprises determining the consistency information based on the result of the comparison.

Description

[0001] The invention relates to a local coil of a magnetic resonance imaging (MRI) unit. In particular, the invention relates to the positioning of a local coil on a part of a patient's body for a magnetic resonance imaging examination using a MRI unit.

[0002] Medical imaging, particularly magnetic resonance imaging (MRI), is an essential diagnostic tool for examining patient body parts, such as extremities. However, a common problem in imaging body parts, especially extremities, is the confusion of the body side. This can occur particularly with body parts that are typically numerous and found on both the left and right sides of the body. This can lead to the wrong body region or part being visualized. These errors can necessitate repeat imaging, which in turn can result in wasted time and costs.

[0003] In addition to incorrect positioning of the local coil on the patient and / or within the magnetic resonance device, inconsistencies may occur in the pre-registration of the control software of the magnetic resonance device (also referred to as the MRI user interface and / or patient registration) and / or a radiology information system (also referred to as examination planning software).

[0004] The use of dedicated local coils or flexibly deployable coils for imaging specific body parts is well-established. For body parts that occur on both the left and right sides of the body, the examiner must manually position the local coil on the correct side before the imaging examination and select the correct side of the body in the MRI user interface, or check the pre-registration. Despite these checks by the examiner, errors, particularly side mix-ups, still occur, disrupting or delaying the diagnostic workflow.

[0005] DE 10 2021 209 750 A1 relates to a method and a system for supporting a magnetic resonance imaging (MRI) examination of a patient by means of a coil placed on the patient. This method preferably serves to control an MRI system and, in particular, allows visual feedback of the coil's positioning and orientation via sensors during MRI examinations.

[0006] The invention is therefore based on the objective of improving the efficiency of imaging examinations, and in particular the preparation for imaging examinations, using a magnetic resonance device. In particular, it can be considered an objective of the invention to ensure the correct positioning of the local coil for an imaging examination using a magnetic resonance device. Furthermore, it can be considered an objective of the invention to reduce and / or inform the examiner of positional errors of the local coil of a magnetic resonance device.

[0007] According to the invention, a method for determining consistency information for a local coil of a magnetic resonance imaging (MRI) device is proposed. The method comprises acquiring measurement information of the local coil. The method comprises determining positioning information. The method comprises determining the consistency information by comparing the measurement information with the positioning information. The measurement information comprises the actual position of the local coil. The positioning information comprises a target position of the local coil. The MRI device is designed to acquire medical image data of a predetermined body region of a patient by means of an imaging examination using the local coil.

[0008] The magnetic resonance imaging (MRI) device is typically designed to acquire medical and / or diagnostic image data of a patient. In particular, the MRI device can be configured to acquire medical image data of a predetermined body region of a patient using one and / or more local coils. The MRI device may include one or more local coils. The MRI device, and in particular a control and / or processing unit of the MRI device, may be connected to one and / or more local coils for signal transmission.

[0009] Furthermore, the magnetic resonance device typically comprises a magnet unit, a patient table, and a control unit. The magnet unit surrounds a patient acquisition area defined by an inner wall of the magnet unit and may include a whole-body coil. The patient table is designed to be movable within the patient acquisition area. In particular, the part of the patient's body from which imaging and / or spectroscopic magnetic resonance signals are to be acquired by the magnetic resonance device is positioned within the magnet opening. Specifically, at least a part of the patient is positioned at an isocenter of the magnetic resonance device, in particular of a main magnetic field. The application of radiofrequency transmission pulses typically generates radiofrequency fields during the magnetic resonance examination, which deflect nuclear spins in the patient, particularly in a specific body region, from their resting position.Subsequent relaxation generates imaging and / or spectroscopic magnetic resonance signals, which can be received by one or more receiving antennas of the magnetic resonance device and used for reconstructing magnetic resonance images or for spectroscopy. In particular, the whole-body coil, which is rigidly integrated into a magnetic unit of the magnetic resonance device, comprises at least one receiving antenna and / or one transmitting antenna.

[0010] While whole-body coils are specifically designed for capturing large areas of a patient's body, local coils can be used as an additional receiver and / or detector to acquire image data from specific body parts. The local coil is designed to be placed directly on and / or in the immediate vicinity of the body part being examined, in order to receive signals from the tissue of that body part through one or more high-frequency receiving antennas on the local coil. Various types of local coils are known for different body parts, for example, orthopedic coils for examining joints such as the knee, shoulder, wrist, or ankle. Local coils are typically adapted in shape and dimensions to the specific anatomy of the body part being examined. In addition, flexible coils for use on different body parts are also known.

[0011] In particular, an imaging examination using a magnetic resonance imaging (MRI) device can be performed according to an imaging protocol. During the imaging examination, the patient is typically wholly or partially within the patient acquisition area. Specifically, the patient may be positioned on a patient support surface of the examination table. To generate imaging and / or spectroscopic magnetic resonance signals during an imaging examination, high-frequency transmission pulses are emitted into the patient acquisition area, specifically into the patient, specifically into a body part, using one or more transmitting antennas, according to a measurement protocol, particularly a magnetic resonance sequence. The imaging examination can also be referred to as a magnetic resonance examination.

[0012] Medical image data may include, in particular, data and / or information generated during a medical imaging examination using a magnetic resonance imaging (MRI) device, especially based on an imaging protocol. For example, medical image data may contain information about the intensity and / or phase of MRI signals emitted by a patient. Medical image data may include, in particular, data in various formats, such as raw data, K-space data, or image-space data. Medical image data may be used, in particular, as input data for the reconstruction of medical images. Medical image data may include, in particular, information, especially reconstructed image data, about the anatomical and / or functional characteristics of the patient under examination.Medical image data may include signals acquired during a medical imaging examination.

[0013] A body region refers in particular to a partial area and / or sub-region of a patient's body. A body region can, in particular, be a body area and / or body part of the patient. In the context of the invention, the term "body region" refers in particular to joints and / or extremities, such as the knee, ankle, shoulder, elbow, or wrist. The predetermined body region is preferably the body region from which image data are to be obtained by means of the imaging examination. Preferably, the patient has another body region corresponding to the predetermined body region, in particular a symmetrical one.

[0014] The measurement information can, in particular, include information characterizing the current position of the local coil. Specifically, the measurement information can be determined using a suitable device for determining the position of the local coil. Specifically, the measurement information can be determined using a measuring instrument, a sensor unit, or a position sensor. The current position can, in particular, characterize the position of the local coil at a specific point in time. The measurement information of the local coil can preferably be acquired at two points in time and at two locations: in a starting position of the patient table (on which the patient is positioned for the imaging examination and which can preferably be moved into the magnetic resonance imaging (MRI) device) before the imaging examination, and / or within the MRI device (in particular with the patient in the examination position for the imaging examination), especially immediately before the imaging examination.In particular, the measurement information of the local coil can be acquired when a patient table is moved into the magnetic resonance imaging (MRI) device. Specifically, the measurement information can identify the current position of the local coil in three spatial directions. Preferably, the measurement information can describe the (ideally actual) spatial location of the local coil's current position. The measurement information can, in particular, include information about the body region around and / or on which the local coil is placed. In other words, the body region on which the local coil is located can be determined by acquiring the measurement information.

[0015] Preferably, the measurement information can comprise a three-dimensional (e.g., in x, y, and z) and / or two-dimensional description (e.g., in x and y) of a measurement point relative to a reference object, in particular a reference point, using a coordinate system. In particular, the measurement information can comprise the actual position of the local coil relative to a coordinate system and / or reference point. The reference point (e.g., the zero point of the coordinate system) can preferably be an isocenter of the magnetic resonance device and / or a reference point of the patient table (for example, a table end and / or table center). The reference point can preferably be a fixed point on the magnetic resonance device. The measurement information can, in particular, be a distance and / or a path length. In particular, the measurement information can be a height value and / or a length value of a path (e.g., in the x, y, and / or z direction) of a coordinate system.In particular, the measurement information can be determined by a sensor unit and transferred / output to a system and / or user interface.

[0016] The positioning information can include, in particular, information specifying the target position of the local coil. Specifically, the positioning information can depend on the patient's body region to be examined and / or predetermined. In other words, the positioning information can include information about the body region around and / or on which the local coil is to be placed. In other words, the positioning information can specify the target position of the local coil on the predetermined body region. Specifically, the positioning information can be derived from information gathered during imaging preparation. This information can include patient registration and / or information from a database and / or patient record.For example, an operator might specify that the patient's left wrist, in a supine, head-first position, is to be examined using an imaging technique. From this information (the predetermined body region), the target position of the local coil can be determined. The target position can, in particular, identify a predetermined position of the local coil. For instance, the target position can indicate which body region from a plurality of body areas and / or body parts is to be imaged. In other words, the target position of the local coil can indicate whether the patient's left or right hand is to be imaged. In other words, the side of the body to be examined, especially the predetermined body region, is determined by the positioning information, specifically the target position of the local coil.

[0017] In particular, the positioning information can specify a positioning (target position) of the local coil in three spatial directions. Preferably, the positioning information can describe the ideal spatial position of the local coil in the magnetic resonance device. Preferably, the positioning information can comprise a three-dimensional (e.g., in x, y, and z) and / or two-dimensional description (e.g., in x and y) of a positioning point starting from a reference object, in particular a reference point, using a coordinate system. In particular, the positioning information can comprise the target position of the local coil with respect to a coordinate system and / or reference point. The positioning information can, in particular, be a distance and / or path length. In particular, the positioning information can be a height value and / or a length value of a path (e.g., in the x, y, and / or z direction) of a coordinate system.In particular, the positioning information can be determined and / or transmitted / output by a computing unit and / or system and / or user interface.

[0018] Comparing the measurement information with the positioning information can include, in particular, determining a difference and / or a correlation. Specifically, comparing the measurement information with the positioning information can be characterized by determining possible and / or actual deviations, errors, and / or peculiarities of the local coil's actual position relative to its target position.

[0019] The consistency information can include, in particular, difference information and / or correlation information between the measurement information and the positioning information. The comparison information can include, in particular, information containing the result of a comparison between the target position of the local coil and the actual position of the local coil. Specifically, the consistency information can include information about possible and / or actual deviations, errors, and / or special characteristics of the actual position of the local coil, as represented by the measurement information, compared to a target position of the local coil, as represented by the positioning information.In particular, the consistency information can include information about a possible and / or actual deviation or error between a predetermined body region mapped by the positioning information and an actual body region mapped by the measurement information where the local coil is located. In other words, the consistency information can preferably indicate whether the local coil is positioned on the predetermined body region (and not on a corresponding, particularly symmetrical, body region). Specifically, the consistency information can include information that can clarify for an operator of the magnetic resonance device whether the correct body region, particularly with respect to the (body) side, is mapped by the measurement information and / or positioning information.

[0020] The consistency information can include, in particular, one or more numerical values ​​and / or character strings, e.g., words. The consistency information can, in particular, include a "true / false" distinction. For example, the consistency information can include the degree of deviation of the actual position from the target position of the local coil. For example, the consistency information can include information to confirm a body region and / or the positioning of the local coil.

[0021] The method for determining consistency information can advantageously improve the efficiency and accuracy of magnetic resonance imaging (MRI) examinations. The correct positioning of the local coil can be ensured by the proposed method. This can minimize mispositioning of the local coil and the associated imaging errors. Furthermore, the probability of positional confusion of body parts can be reduced, and the examiner can be informed of potential inconsistencies. This can improve the quality of medical image data. The method can result in significant time and cost savings for patients, medical professionals, and / or institutions, as repeat examinations can be avoided. Overall, the method can enable more precise diagnoses and better decision-making by medical professionals in medical imaging processes.

[0022] According to a preferred aspect of the invention, determining the positioning information includes determining the target position of the local coil based on the predetermined body region of the patient.

[0023] The positioning information can include operator-defined information about a patient's body region to be examined using the medical imaging device. The predetermined body region of the patient preferably corresponds to the body region to be examined from an examination plan. The examination plan can be provided to the magnetic resonance imaging (MRI) device by an operator, a storage unit, and / or a database. Preferably, the MRI device, and in particular a processing unit of the MRI device, can be configured to automatically determine a target position of the local coil from a predetermined body region of the patient and optionally display it to an operator. For example, an operator can designate a patient's left knee as the body region to be examined.The magnetic resonance device can, for example, determine the positioning of the local coil around the patient's left knee and optionally display it to an operator via an output unit.

[0024] By determining the target position of the local coil based on the predetermined body region, potential deviations in coil positioning can be minimized, thereby improving the consistency and / or efficiency of the imaging. This results in correct local coil positioning and consistent, high-quality medical image data.

[0025] According to a preferred aspect of the invention, the method also includes obtaining medical image data of the predetermined body region of the patient by means of an imaging examination. The imaging examination is performed depending on the consistency information.

[0026] In other words, imaging using the magnetic resonance device is advantageously performed only if the comparison of the measurement information with the positioning information yields a positive result. In other words, imaging using the magnetic resonance device is performed only if the consistency information matches a predetermined value. For example, the consistency information can have a binary value ("0 or 1"), and imaging is performed only if a predetermined value, such as "1," is found.

[0027] This can advantageously ensure that an imaging examination can only be performed if the local coil is correctly positioned at the predetermined body region.

[0028] According to a preferred aspect of the invention, the method further comprises determining a patient registration. The patient registration includes parameters for an imaging examination. Determining the positioning information includes determining the target position of the local coil based on the patient registration.

[0029] Patient registration can include, for example, a radiology information system (RIS) and / or, preferably, examination planning software for the magnetic resonance imaging (MRI) scanner. In particular, patient registration can include patient data such as age, height, and diagnosis. Specifically, patient registration can include the parameters required and / or predetermined for the imaging examination. For example, patient registration can include information about the type of local coil to be used. Patient registration can be determined by information entered by the operator. In particular, patient registration can be determined, at least partially (one or more parameters), automatically from historical patient data. Determining the patient registration can be performed by a processing unit of the MRI scanner.Patient registration can be provided to an operator via an output unit of the magnetic resonance device.

[0030] An imaging parameter can include, in particular, information for controlling a medical imaging device and / or imaging parameters, especially a measurement protocol for performing a medical imaging examination. The parameter can, in particular, include information for performing an imaging examination using a magnetic resonance imaging (MRI) device. In particular, several parameters can define a measurement protocol and / or a measurement sequence. For example, the parameters (also called imaging parameters) can include a slice spacing, number of slices, slice thickness, a turbo factor, and / or a flip angle. In other words, the parameters can include, in particular, information about a type of examination and / or imaging device, parameters, values, setting information, and / or a protocol of the medical imaging examination.

[0031] The patient registration process, and in particular the associated imaging parameters, can advantageously enable a precise determination of the target position of the local coil. This can lead to improved positioning of the local coil and thus to a more efficient execution of the imaging examination. Patient registration can also be advantageous in clarifying the target position of the local coil and / or the parameters of the planned imaging examination for the operator. This can facilitate the positioning of the local coil for the operator. Furthermore, it can improve the efficiency of imaging examination preparation.

[0032] According to a preferred aspect of the invention, the patient registration is determined using information from a hospital and / or radiology information system.

[0033] A hospital and / or radiology information system (HIS and / or RIS) can, in particular, comprise an information system for the management and / or organization of information in hospitals and / or other healthcare facilities. A hospital and / or radiology information system can, in particular, enable the collection, storage, and / or management of patient data, medical image data, appointment scheduling, billing, electronic health records (EHRs), and laboratory information. In particular, the hospital and / or radiology information system can be designed as a database. In particular, the hospital and / or radiology information system can be connected via a network to other systems and / or equipment within a healthcare facility, especially a magnetic resonance imaging (MRI) scanner.

[0034] Determining the patient registration using information from a hospital and / or radiology information system can be performed, in particular, by a processing unit of the magnetic resonance imaging (MRI) device. Specifically, the processing unit can be connected to a database (of the hospital and / or radiology information system). Specifically, the processing unit can be configured to search the hospital and / or radiology information system for predefined information to determine the patient registration. Specifically, the patient registration can be determined using a trained function. Specifically, the trained function can be configured to compare a predetermined body region with information from the hospital and / or radiology information system and / or to determine a target position for the local coil.

[0035] The automatic retrieval of patient registration data from a hospital and / or radiology information system can be advantageous, enabling precise and automated patient data acquisition. This allows the data stored in a hospital and / or radiology information system to be considered when determining consistency information, thereby reducing errors in the generation of medical image data.

[0036] The procedure also includes providing the consistency information to an operator of the magnetic resonance device.

[0037] Providing consistency information to an operator of the magnetic resonance device includes, in particular, displaying, transmitting, storing, or processing the consistency information. For example, the consistency information can be displayed and / or clarified to an operator using a display unit of the magnetic resonance device. The consistency information can also be stored in, transmitted to, and / or further processed by a database, a computing unit, and / or a control unit.

[0038] Providing consistency information can advantageously clarify the result of comparing the measurement information with the positioning information for the operator. This allows the operator, in particular, to identify any discrepancy between the actual positioning of the local coil and its intended positioning.

[0039] According to a further aspect of the invention, the method optionally includes the acquisition of user input. Based on this user input, a change to the actual position of the local coil and / or a change to the positioning information, in particular the patient registration, can be made.

[0040] User input can be captured, for example, via an output unit, in particular via a user interface encompassed by the output unit. Specifically, the user input can be dependent on the provided consistency information. Specifically, providing the consistency information can include generating a representation of the consistency information for display to an operator in a user interface. The representation optionally includes one or more response options. Generating the representation optionally includes creating at least one response option from the consistency information. Providing the representation to the user can occur in the user interface. The method can include receiving, optionally via the user interface, user input aimed at selecting a response option.

[0041] The ability to capture user input can be advantageous for easily correcting the actual position of the local coil and / or changing the positioning information, especially the patient registration.

[0042] According to a preferred aspect of the invention, providing the consistency information includes outputting a visual, haptic and / or acoustic cue signal to the operator of the magnetic resonance device.

[0043] The output of a warning signal to the operator of the magnetic resonance imaging (MRI) device can be provided, in particular, by a suitably designed output unit, especially the MRI device and / or local coil. The output unit can, in particular, include an audio and / or visual unit for generating an audio and / or visual signal. The output unit can be integrated into a unit, in particular the user interface, of the MRI device. The output unit can be configured to output an imaging parameter, consistency information, and / or patient registration. For example, the output unit can output a warning signal in the form of a flashing light signal. Preferably, one output unit can be provided for multiple units, in particular multiple local coils, of the MRI device.

[0044] The warning signal comprises a visual, haptic, and / or audible signal recognizable to the operator, in particular a light signal and / or an audible signal. The warning signal may, for example, include textual and / or graphical output via a user interface and / or output unit of the magnetic resonance imaging (MRI) device. The warning signal may include multiple warning signals and / or warning signals. Depending on the consistency information, a warning signal may be issued that can clarify a local coil misposition classification to an operator of the MRI device. For example, a possible mix-up of two patient body parts to be examined (e.g., left elbow or right elbow) may be indicated by a loud warning sound as a warning signal.For example, the frequency of a tone in the cue signal can be increased and / or decreased depending on the positioning of the local coil. Preferably, the consistency information can be provided by means of a combination of several visual, haptic, and / or acoustic cue signals.

[0045] The consistency information can advantageously be made clear to the operator efficiently and user-friendly by means of a warning signal. The warning signal reliably indicates to the operator that a specific consistency information is present. In particular, providing the consistency information as a warning signal can advantageously clarify the consistency information for the operator in addition to a display for controlling the magnetic resonance device.

[0046] According to a preferred aspect of the invention, the measurement information of the local coil is acquired by a sensor unit encompassed by the local coil.

[0047] In particular, the sensor unit can include a Hall sensor. In particular, the sensor unit can include a mechanical and / or electrical contact sensor. The measurement information can include, in particular, position information from at least one sensor unit.

[0048] A sensor unit (also simply called a sensor) is generally designed to determine the position of an object. In particular, the sensor unit can be designed to determine position information as measurement data for at least one local coil. One and / or more sensors can form a sensor unit for determining the measurement information. The sensor unit can, in particular, continuously determine and / or output position information and / or at specific time intervals. Furthermore, the sensor unit can, in particular, only output position information if the patient is positioned outside a magnetic opening of the magnetic resonance device and / or is moved into the magnetic opening of the magnetic resonance device, particularly by means of a patient table. The position information can include discrete information, such as an angle and / or distance measurement, about the spatial positioning of the local coil.

[0049] A sensor unit can be configured, in particular, to detect the position of the local coil at a predetermined body region of the patient. For example, the sensor unit can return a zero signal if positioned at a different body part of the patient. Specifically, the sensor unit can determine the position of the local coil on the patient table within the patient acquisition area of ​​the magnetic resonance imaging (MRI) device. Specifically, the sensor unit can be connected to a processing unit of the MRI device for data transmission. Specifically, the sensor unit can be configured to provide measurement information to the processing unit.

[0050] A Hall sensor, in general, can determine the presence and strength of a magnetic field through the so-called Hall effect. The Hall sensor can therefore generate a voltage proportional to the magnetic field strength. This Hall voltage allows the determination of the magnetic field intensity. From the determined magnetic field intensity, position information, in particular measurement information, can be derived. In other words, the Hall sensor enables precise position and motion detection of the local coil.

[0051] Electrical and / or mechanical contact sensors, in general, can detect physical contact between two components and convert it into an electrical signal. An electrical contact sensor typically closes a circuit when two conductive surfaces come into contact. A mechanical contact sensor can typically detect mechanical movements, such as the closing of a switch. For example, a local coil positioned at a predetermined location on a patient table can cause the contact sensor to make contact with an associated counterpart unit enclosed by the patient table.

[0052] Advantageously, the measurement information of the local coil, obtained through a sensor unit encompassed by the local coil, enables a precise and robust determination of the coil's position. Through (continuous) monitoring and recording of the local coil's position, misalignments can be detected and corrected early.

[0053] The invention also proposes a magnetic resonance device for acquiring medical image data of a predetermined body region of a patient using a local coil. The magnetic resonance device is configured to perform a method according to one of the aspects described above.

[0054] In particular, a magnetic unit of the magnetic resonance device can comprise a main magnet, a gradient coil unit, and a radio frequency antenna unit. The main magnet of the magnetic unit is preferably configured to generate a homogeneous (strong, constant) main magnetic field with a defined and / or specific magnetic field strength, such as a defined and / or specific magnetic field strength of 3 T, 1.5 T, or 0.55 T. The homogeneous main magnetic field is preferably located within a patient acquisition area of ​​the magnetic resonance device. The magnetic unit typically surrounds the patient area (or patient acquisition area), which is designed to accommodate a patient for a magnetic resonance examination. The gradient coil unit is preferably configured to generate gradient fields used for spatial coding during imaging.The high-frequency antenna unit is preferably fixed within the magnetic unit and designed and / or configured to emit an excitation pulse. To detect the magnetic resonance signals, the magnetic resonance device preferably has local high-frequency coils (local coils) arranged around the area of ​​the patient being examined.

[0055] Furthermore, the magnetic resonance device may include a processing unit and / or an output unit. The processing unit is specifically designed for controlling and / or regulating the medical magnetic resonance device. The output unit is specifically designed for providing consistency information to the operator, particularly in the form of a warning signal. The magnetic resonance device may also include at least one sensor and / or sensor unit. The sensor may be configured to detect the actual position of the local coil and / or to transmit measurement information containing the actual position to the processing unit.

[0056] The advantages of the proposed magnetic resonance device are essentially the same as the advantages of the proposed method. Features, advantages, or alternative embodiments / aspects of the method can likewise be transferred to the other claimed subject matter and vice versa.

[0057] According to one aspect of the invention, a sensor unit and / or sensor can be arranged on the magnetic resonance device, particularly on and / or in the inner wall of the magnet unit, especially within the patient acquisition area. The sensor unit can also be arranged outside the patient acquisition area, particularly on an end face and / or a housing element of the magnet unit. The sensor unit can be arranged at and / or relative to a reference point, for example, the center of the magnet opening or a predetermined point on the inner wall of the magnet unit. In other words, the magnetic resonance device can include a sensor unit for acquiring measurement information from the local coil that is not encompassed by the local coil.

[0058] Advantageously, a sensor unit integrated into the magnetic resonance device enables position determination of the local coil, particularly independently of the local coil itself. This allows, for example, the use of known local coils for position detection, especially without a sensor unit.

[0059] Furthermore, according to the invention, a local coil for acquiring medical image data of a predetermined body region of a patient using a magnetic resonance device is proposed. The local coil is configured to perform a method according to one of the aspects described above.

[0060] Local coils generally operate on the principle of electromagnetic induction. Specifically, local coils can receive signals generated during magnetic resonance imaging (MRI), particularly MRI signals. During an MRI scan, the main magnet of the MRI scanner generates a strong, static magnetic field. High-frequency (RF) pulses can be emitted, which excite, in particular, the hydrogen protons in a patient's body, allowing them to align parallel or antiparallel to the magnetic field. When the RF pulse is stopped, the protons can return to their original state, emitting RF signals in the process. These signals can be received with particular precision by local coils.

[0061] The local coil typically includes receiving coils to receive RF signals. Additionally, local coils may include preamplifiers, particularly to improve the signal-to-noise ratio.

[0062] The local coil can also include at least one sensor and / or sensor unit. The sensor can be configured to detect the actual position and / or measurement information of the local coil and to transmit measurement information including the actual position to the processing unit.

[0063] The local coil includes an output unit. The local coil is designed to receive consistency information and, based on this information, output a warning signal to an operator. For this purpose, the local coil can include an output unit in the form of a light element and / or a tone-generating element. For example, the local coil can include an LED light element that provides a predefined, color-coded warning signal to a user, depending on the determined consistency information. In other words, if the measurement information does not match the positioning information, the operator can be alerted to the consistency information by a red flashing light element on the local coil.

[0064] The output unit at the local coil can advantageously clarify consistency information for the operator of the magnetic resonance device. This also allows the operator to be alerted to potential mispositioning of the local coil during its initial positioning.

[0065] According to a preferred aspect of the invention, the local coil comprises a computing unit. The computing unit of the local coil is preferably configured to execute a method according to one of the aspects described above. The computing unit is particularly configured for controlling and / or regulating the local coil. The computing unit of the local coil can be connected to a computing unit of the magnetic resonance device via a signal connection.

[0066] Advantageously, a computing unit encompassed by the local coil can represent an additional autonomous unit (to the control unit of the magnetic resonance device) for determining the consistency information.

[0067] The advantages of the proposed local coil essentially correspond to the advantages of the proposed method and the proposed magnetic resonance device. Features, advantages, or alternative embodiments / aspects of the method can likewise be transferred to the other claimed subject matter and vice versa.

[0068] Furthermore, a computer program product is proposed that comprises a program and can be directly loaded into the memory of a programmable system control unit of a medical imaging device. The computer program product includes program resources, such as libraries and auxiliary functions, to execute a proposed method when run in the system control unit of the magnetic resonance device and / or local coil. The computer program product may comprise software with source code that still needs to be compiled and bound or interpreted, or executable software code that only needs to be loaded into the system control unit for execution.

[0069] The proposed method can advantageously be executed quickly, identically, and robustly by the computer program product. The computer program product is preferably configured to execute the proposed method steps via the system control unit. The system control unit possesses the necessary prerequisites, such as sufficient main memory, a suitable graphics card, or a suitable logic unit, so that the respective method steps can be executed efficiently.

[0070] The computer program product is stored, for example, on a computer-readable medium or on a network or server, from where it can be loaded into the processor of a local system control unit. This processor may be directly connected to the magnetic resonance device and / or local coil or may be formed as part of the magnetic resonance device and / or local coil. Furthermore, control information for the computer program product may be stored on an electronically readable data carrier. The control information on the electronically readable data carrier may be designed such that, when the data carrier is used in a system control unit of a magnetic resonance device and / or local coil, it executes a proposed procedure.

[0071] Examples of electronically readable data carriers include a DVD, a magnetic tape, or a USB flash drive on which electronically readable control information, in particular software, is stored. If this control information is read from the data carrier and stored in a system control unit of the medical imaging device, all proposed embodiments of the previously described methods can be carried out.

[0072] Further advantages, features, and details of the invention will become apparent from the exemplary embodiments described below and from the drawings. Corresponding parts are designated with the same reference numerals in all figures. The modifications mentioned in this context can be combined with one another to form new embodiments.

[0073] They show: Fig. 1 a flowchart of a method for determining consistency information for a local coil of a magnetic resonance device according to a preferred embodiment with an optional method step for providing the consistency information, Fig. 2 a flowchart of a method for determining consistency information for a local coil of a magnetic resonance device comprising several optional method steps according to a preferred embodiment, Fig. 3 a data flow diagram of a method for determining consistency information for a local coil of a magnetic resonance device according to an embodiment, Fig. 4 a schematic representation of an embodiment of a magnetic resonance device according to an embodiment, Fig. 5 a schematic representation of an embodiment of a local coil according to an embodiment.

[0074] Fig. Figure 1 shows a first embodiment of a method for determining consistency information KD for a local coil 9 of a magnetic resonance device 10. Fig. Figure 1 shows the main process steps of the method in an embodiment with an optional process step S40 of providing the consistency information, while Fig. 2. In addition, several optimal process steps and / or sub-steps S40, S50, S60, S70 of the process in one embodiment are illustrated. The processes, or the process steps from the Fig. 1 and Fig. 2 are also defined by the data flow diagram of the Fig. 3 illustrates this.

[0075] In a process step S10 of acquiring measurement information MI of the local coil 9, an actual position IL of the local coil 9 is acquired and provided. The measurement information MI comprises detailed position information of the local coil, in particular a three-dimensional spatial description (in x, y, and z) of a measurement point, especially starting from a reference point. Preferably, the measurement information MI can be represented and provided by means of a coordinate system. The measurement information MI can, in particular, be provided to a computation module VGM. The computation module VGM can, in particular, be a processing unit of the magnetic resonance device 10 and / or local coil 9 and / or be encompassed by them. The acquisition of the measurement information MI is preferably carried out with a (Hall) sensor 8 of the local coil 9.

[0076] In process step S20 of determining positioning information PI, a target position IL of the local coil 9 is determined and provided. The positioning information PI comprises a predetermined position, in particular a target position SL of the local coil 9, especially based on information IK about a body region of the patient. Similar to the actual position IL of the local coil 9, the target position SL of the local coil 9 can include a three-dimensional spatial description (in x, y, and z) of a point, particularly starting from a reference point. Preferably, the positioning information PI can be represented and provided using a coordinate system. The positioning information PI can, in particular, be provided to a comparison module VGM.

[0077] Determining S20, a positioning information PI, can involve several sub-steps. These sub-steps are described in... Fig. 1 and Fig. The two steps, not shown, can be executed sequentially and / or in parallel as process steps encompassed by S20. One sub-step can include determining S21 the target position SL of the local coil 9 based on the predetermined body region of the patient. Another sub-step can include determining S22 a patient registration PR. By determining S22 the patient registration PR, parameters for an imaging examination using the magnetic resonance device 10 can be determined, set, and / or defined. Based on the patient registration PR, the positioning information PI and / or the target position SL of the local coil 9 can then be determined. The patient registration PR can preferably be determined, derived, and obtained from a hospital and / or radiology information system (HIS, RIS, DB).

[0078] In a process step S30 of determining the consistency information KD based on the positioning information PI and the measurement information MI, a comparison and / or alignment of the actual measurement data, the actual position IL, with the target position SL of the local coil 9 is preferably performed. For this purpose, evaluation functions and / or similarity functions can be applied, for example, to analyze and quantify the deviations and similarities between the data. The determination of the consistency information KD S30 is performed in particular by a comparison module VGM comprised of a processing unit. The comparison module VGM can output a positive p (e.g., 1) consistency information KD or a negative n (e.g., 0) consistency information KD as a result of comparing the measurement information MI with the positioning information PI. Alternatively and / or additionally, the consistency information KD can also have a (discrete) value.

[0079] Determining the consistency information KD (S30) can, in particular, involve determining a similarity measure using a similarity function. The similarity function compares the positioning information PI and the measurement information MI. For example, coordinate points of the positioning information PI and the measurement information MI can be compared. Specifically, the distances between the coordinate points of the positioning information PI and the measurement information MI can be determined. The similarity measure then depends, for example, on the sum of the squared distances. Specifically, the similarity measure depends on the negative sum of the squared distances. Alternatively, the similarity measure can be proportional to the inverse of the sum of the squared distances. In this case, the smaller the sum of the squared distances, the larger the similarity measure.In other words, the similarity measure describes how closely the positioning information (PI) corresponds to the measurement information (MI). Alternatively or additionally, the similarity measure can depend on a cross-correlation and / or a normalized cross-correlation and / or a covariance and / or a correlation coefficient between the positioning information (PI) and the measurement information (MI).

[0080] In an optimal process step (S40) of providing consistency information KD, the determined consistency information KD is made available. This consistency information KD can be used to ensure that the local coil 9 is correctly positioned and that medical image data of a predetermined body region is acquired (S70) using the local coil and magnetic resonance device. Deviations or anomalies between the positioning information PI and the measurement information MI can be detected by providing the consistency information KD (S40) to an operator U of the magnetic resonance device 10. Providing the consistency information KD (S40) can, for example, include output (S50) of the consistency information KD via a user interface (UI) and / or an output unit (AE).The consistency information KD can also be provided, for example, to a control unit and / or computing unit of the magnetic resonance device 10 for controlling an imaging examination.

[0081] In an optimal process step S50 of the consistency information KD, the determined consistency information KD is output, in particular to an operator U. Providing S40 of the consistency information KD can include the output of the consistency information KD. The output of the consistency information KD can, in particular, be in the form of a visual, haptic, and / or acoustic indicator signal SH. Specifically, the output of the consistency information KD can be via a user interface UI and / or output unit AE, especially on the magnetic resonance device. For example, in the case of a negative consistency information KD, the output unit AE of the local coil 9 can send an indicator signal SH to a user U in the form of a colored signal.

[0082] Optional step S60 involves human-machine interaction via user input. The operator can enter user input (BE) using the user interface (UI). This user input (BE) can be processed by the user interface (UI), or the patent registration (PR) can be adapted and / or modified via the user interface (UI) based on the user input (BE).

[0083] For example, capturing user input can involve several substeps. In particular, several different response options can be provided, which can be displayed, for example, in a user interface (UI). User input (BE) can be received by the UI, which is aimed at selecting one or more of the provided response options and / or rejecting others. The selected response options can then be used to modify the patient registration (PR) and / or adjust the positioning of the local coil.

[0084] According to some implementations, user input (BE) can also be fed back to the analysis function to improve it - for example, by further training it.

[0085] In other words, the optional step S60 is aimed at incorporating user input BE. This user input BE can be entered by a user U into a front-end computing unit and / or a user interface and received by a back-end computing unit. Preferably, the user input BE is input from the operator U, which they make as part of an analysis of the consistency information KD.

[0086] The acquisition (and / or determination) of medical image data S70 essentially comprises performing a medical imaging examination using the magnetic resonance imaging (MRI) device. The acquisition of medical image data S70 may also include sub-steps necessary for preparing a medical imaging examination using the MRI device. During the medical imaging examination, medical image data of the patient's body part are acquired according to an imaging protocol.

[0087] The process steps S10 of acquiring measurement information MI and determining positioning information PI can also be performed simultaneously or in reverse order. Furthermore, process steps S10, S20, S30 (and S40) can be performed multiple times and / or iteratively. In particular, process steps S10, S20, S30 (and S40) can be performed before, but also after and during one (or more) imaging examinations using the magnetic resonance device 10.

[0088] Fig. Figure 3 illustrates the data flow of a method for determining consistency information KD for a local coil 9 of a magnetic resonance device 10 according to an embodiment.

[0089] A sensor 8 can be used to determine measurement information MI of a local coil 9. The measurement information MI includes the actual position IL of the local coil 9 in a magnetic resonance device 10. Position information PI can be determined from a patient registration PR. The position information PI includes information IK about a (to be examined) body region of a patient. The position information PI includes a target position SL of the local coil 9 in the magnetic resonance device 10. The patient registration PR is connected to a database DB. The patient registration PR can query all information required for performing a magnetic resonance examination using the magnetic resonance device 10 from the database DB and / or a user interface UI. The patient registration PR can include the output information for setting the parameters of the magnetic resonance device 10.

[0090] The position information PI and measurement information MI can be received by a comparison module VGM. The comparison module VGM determines a consistency information KD by comparing the position information PI and measurement information MI. The consistency information KD can, for example, include a classification as positive p or negative n. If the consistency information KD is determined to be negative, the VGM can transmit it to a user interface UI and / or an output unit AE. The user interface UI can, for example, be the magnetic resonance device 10. The output unit AE can, for example, be the local coil 9. The comparison module VGM can also be connected to the database DB. For the comparison of the position information PI and measurement information MI, the VGM can query information from the database DB.For example, the VGM comparison module can compare the information from the patient registration PR, especially the positioning information PI, with the information from the database DB.

[0091] A warning signal SH can be output to an operator U of the magnetic resonance device 10 via the user interface UI and / or output unit AE. Furthermore, an operator U of the magnetic resonance device 10 can be enabled to input a user input BE via the user interface UI. The user input BE can be captured and processed by the user interface UI. Depending on the user input BE, the user interface UI can transmit a signal to the patient registration unit PR. For example, the information IK stored in the patient registration unit PR regarding the body part to be examined and / or the target position SL of the local coil can be adjusted by the signal from the user interface UI. In other words, the patient registration unit PR can be adjusted via the user interface UI using a user input BE.

[0092] In Fig. Figure 4 schematically depicts a magnetic resonance device 10. The magnetic resonance device 10 comprises a magnetic unit 11, which includes a main magnet 12 for generating a strong and, in particular, time-constant main magnetic field 13. The magnetic resonance device 10 also has a magnetic opening 14 for receiving a patient 15; that is, the magnetic opening 14 can be considered the patient receiving area. The magnetic opening 14 is in the form of a cylinder with a central axis z in the z-direction and is surrounded circumferentially by the magnetic unit 11. The magnetic opening 14 is bounded by an inner wall W of the magnetic unit 11. The patient 15 can be moved into the magnetic opening 14 by means of a patient positioning device 16 of the magnetic resonance device 10. For this purpose, the patient positioning device 16 has a patient table 17 that is movably designed within the magnetic opening 14.

[0093] The magnetic unit 11 further comprises a gradient coil unit 18 with at least one gradient coil for generating magnetic field gradients, which are used for spatial encoding during imaging. The gradient coil unit 18 is controlled by a gradient control unit 19 of the magnetic resonance device 10. The magnetic unit 11 further includes a high-frequency antenna unit 20 with at least one transmitting antenna, which in the present embodiment is designed as a whole-body coil permanently integrated into the magnetic resonance device 10. The high-frequency antenna unit 20 is controlled by a high-frequency antenna control unit 21 of the magnetic resonance device 10 and transmits high-frequency magnetic resonance sequences, in particular RF transmit pulses, into a patient acquisition area, which is essentially formed by the area of ​​the magnetic aperture 14 of the magnetic resonance device 10.This causes the main magnetic field 13 generated by the main magnet 12 to excite atomic nuclei by deflecting nuclear spins from their resting position. The relaxation of the excited atomic nuclei generates magnetic resonance signals. The high-frequency antenna unit 20 can, in principle, be configured to receive these magnetic resonance signals.

[0094] In addition to and / or encompassed by the high-frequency antenna unit 20, the magnetic resonance device can include a local coil 9. The local coil 9 can be configured similarly to the high-frequency antenna unit 20. However, unlike the high-frequency antenna unit 20, the local coil 9 can be positioned directly around a part of the patient's body 15. The magnetic unit 11 can therefore further comprise at least one local coil equipped with a receiving antenna, which, in the present embodiment, is positioned in the magnetic opening 14 of the magnetic resonance device 10 on an arm of the patient 15, in particular the elbow. The local coil 9 can, in particular, receive high-frequency magnetic resonance sequences, especially RF transmit pulses, from a patient acquisition area. The patient acquisition area is essentially formed by the area of ​​the magnetic opening 14 of the magnetic resonance device 10.In principle, the local coil 9 can be designed to receive the magnetic resonance signals, or the relaxation of the excited atomic nuclei of the body region of the patient 15.

[0095] The magnetic resonance imaging (MRI) device 10 includes a system control unit 22 for controlling the main magnet 12, the gradient control unit 19, and the high-frequency antenna control unit 21. The system control unit 22 centrally controls the MRI device 10, for example, by performing a predetermined imaging gradient echo sequence. The system control unit 22 also includes an evaluation unit (not shown) for evaluating the magnetic resonance signals acquired during the MRI scan. Furthermore, the MRI device 10 includes a user interface 23 connected to the system control unit 22. Control information, such as imaging parameters, and reconstructed MRI images can be displayed on a display unit 24, for example, on at least one monitor, via the user interface 23 for medical personnel.Furthermore, the user interface 23 has an input unit 25 by means of which information and / or parameters can be entered by the medical operating personnel during a measurement process. The user interface 23, in particular the display unit 24, can also have an output unit 7b (corresponding to UI from ). Fig. 3) include. The output unit 7b may be configured to output a visual, haptic and / or acoustic cue signal.

[0096] The magnetic resonance device 10, in particular the system control unit 22, can also include a comparator module 6 (corresponding to VGM from Fig. 3), as in Fig. Figure 3 schematically comprises the comparator module 6. The comparator module 6 serves to determine the consistency information KD. This consistency information is intended to ensure that a different body part of the patient 15 is not accidentally imaged with the magnetic resonance device 10 than intended. The comparator module 6 can be connected to a sensor 8 of the local coil. The comparator module 6 can be configured to determine the position of the local coil 9 in the magnet opening 14 based on the position information obtained from the sensor 8.

[0097] The comparator module 6 receives the measurement information from the local coil and can determine the positioning information. The comparator module 6 can correspond to a test unit connected to the system control unit 22 and the user interface 22. However, the comparator module 6 can also be fully integrated into the system control unit 22. The comparator module 6 can be configured to check whether the consistency information meets or falls below a limit value. If the limit value is exceeded or falls below a limit value, the comparator module 6 can send a warning message to the user interface 23 to inform the medical operating personnel.

[0098] The magnetic resonance device 10 (not shown) can also include a sensor unit, which may be arranged on and / or in the inner wall. The sensor unit can, in particular, detect measurement information from the local coil, especially its actual position, and send it to the comparator module 6. The sensor unit is configured to determine the position of the local coil 9 within the patient acquisition area 14 and to send position information to the comparator module 6.

[0099] The local coil 9 can also be an output unit 7a (corresponding to AE from Fig. 3) include. In particular, the output unit 7a may be configured to output a visual, haptic, and / or acoustic cue signal. For example, the local coil 9 may include an LED strip configured to output consistency information, which may, in particular, output visual cues to an operator depending on the specific consistency information.

[0100] In Fig. Figure 5 is a local coil 9 in one embodiment shown schematically. The local coil 9 shown comprises a sensor 8, a comparator module 6 (corresponding to VGM from Fig. 3) and an output unit 7 (corresponding to AE from Fig. 3) The sensor 8 is configured to acquire measurement information from the local coil 9. In particular, the sensor 8 of the local coil 9 can determine a relative position (depending on a reference point) of the local coil 9 within a magnetic resonance device. Specifically, the sensor 8 of the local coil 9 can acquire the actual position of the local coil 9, the current position. The output unit 9 is configured to output a warning signal to an operator of the magnetic resonance device. The output unit 9 can be configured to output a visual, haptic, and / or acoustic warning signal. For example, the output unit 9 can include a tone generation unit for outputting an acoustic warning signal. The output unit 9 can also, for example, include a vibration unit for outputting a haptic warning signal. The comparator module 6 can be configured as a processing unit.The comparator module 6 of the local coil 9 can be connected to the sensor 8 and / or the output unit 7 for data exchange. For example, the comparator module 6 can receive measurement information from the sensor 8 and / or send an output signal to the output unit 7 to output a warning signal. The comparator module 6 can also be connected to a control unit of a magnetic resonance device for data exchange. In particular, the comparator module 6 can receive position information, especially a target position of the local coil 9, from the control unit of a magnetic resonance device. The comparator module 6 of the local coil 9 can be configured, in particular, to compare the measurement information with the positioning information and / or to determine consistency information. The comparator module 6 can, in particular, be configured to execute a method as described in [reference]. Fig. 1 and Fig. 2 shown.

[0101] Finally, it should be noted once again that the methods described in detail above, as well as the illustrated magnetic resonance device, are merely exemplary embodiments which can be modified in various ways by those skilled in the art without departing from the scope of the invention. Furthermore, the use of the indefinite articles "a" or "an" does not preclude the possibility that the features in question may be present multiple times. Likewise, the term "unit" does not preclude the possibility that the components in question consist of several interacting sub-components, which may also be spatially distributed. Regardless of the grammatical gender of a particular term, persons of male, female, or other gender identities are included.

Claims

[1] Method for determining consistency information for a local coil of a magnetic resonance device, wherein the magnetic resonance device is configured to determine medical image data of a predetermined body region of a patient by means of an imaging examination using the local coil, comprising: Acquisition (S10) of measurement information from the local coil, the measurement information includes an actual position of the local coil, Determining (S20) positioning information, the positioning information includes a target position of the local coil, Determining (S30) the consistency information by comparing the measurement information with the positioning information, Providing (S40) the consistency information to an operator of the magnetic resonance device, wherein the local coil includes an output unit, and the local coil is configured, to receive the consistency information and to issue a warning signal to the operator based on the consistency information. [2] Method according to claim 1, wherein determining (S21) the positioning information comprises determining the target position of the local coil based on the predetermined body region of the patient. [3] Method according to any of the preceding claims, furthermore comprising: Obtaining (S70) medical image data of the predetermined body region of the patient by means of an imaging examination, the imaging examination is performed depending on the consistency information. [4] Method according to any of the preceding claims, further comprising: Determining (S22) a patient registration, where the patient registration includes parameters for an imaging examination, where determining the positioning information includes determining the target position of the local coil based on the patient registration. [5] Method according to the preceding claim, wherein the determination of the patient registration is carried out using information from a hospital and / or radiology information system. [6] Method according to any of the preceding claims, wherein providing the consistency information comprises outputting (S50) a visual, haptic and / or acoustic cue signal to the operator of the magnetic resonance device. [7] Method according to one of the preceding claims, wherein the acquisition of the measurement information of the local coil is carried out by a sensor unit encompassed by the local coil, in particular a Hall sensor. [8] Magnetic resonance device for determining medical image data of a predetermined body region of a patient using a local coil, wherein the magnetic resonance device is configured to perform a method according to the preceding claims, wherein the local coil comprises an output unit, and the local coil is configured to receive the consistency information and to output a guidance signal to the operator based on the consistency information. [9] Local coil for determining medical image data of a predetermined body region of a patient using a magnetic resonance device, wherein the local coil is configured to perform a method according to the preceding method claims, wherein the local coil comprises an output unit, and the local coil is configured to receive the consistency information and to output a guidance signal to the operator based on the consistency information.

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