Medical imaging method involving guidance

Abstract

The invention relates to a method of operation of a medical imaging system 100 and a respective medical imaging system 100 operable according to this method, which automatically supports an imaging procedure, comprising the steps of: a data processing unit 120 determining a positioning rule indicating at least one or more target positions for at least a region of interest, whereby a deviation between the actual position and the target position may affect the imaging performance, the data processing unit 120 acquiring measurement data of at least the region of interest from which the actual position of at least the region of interest can be derived, the data processing unit 120 determining a current deviation between at least the actual position of the region of interest and the target position by comparing the positioning rule with the acquired measurement data, the data processing unit generating imaging performance information 121 indicating at least whether a current deviation between at least the actual position of the region of interest and the target position is currently affecting the imaging performance in terms of image quality and / or remaining imaging time or is predicted to affect the imaging performance in terms of image quality and / or remaining imaging time, and the data processing unit 120 providing the generated imaging performance information to be communicated to the subject S being imaged.

Description

[Technical field]

[0001] The present invention relates to medical imaging, and in particular to a computer-implemented method for operating a medical imaging system, a medical imaging system, and computer program elements. [Background technology]

[0002] In medical imaging, and particularly in medical imaging facilities, it is desirable to have as high a patient throughput as possible. At the same time, image quality should be as good as possible, which are conflicting goals. In practice, these conflicting goals can be addressed by instructions from medical professionals prior to the actual imaging procedure, and particularly the actual image acquisition, to support or assist the patient as much as possible, for example by limiting or avoiding motion, so that image quality is as high as possible. For example, the patient may be informed about what actions are required during the imaging procedure to achieve suitable and / or high image quality to facilitate diagnosis. In some cases, the patient may think that they have a good understanding of the imaging procedure and / or about what is going to happen and what is expected of them. However, at least in some cases, the patient may have overlooked something or simply misunderstood some information regarding the patient's behavior during individual imaging procedure steps, which may result in reduced image quality, for example in the case of undesirable motion, and / or reduced patient throughput at the medical imaging facility if image acquisition has to be repeated as a result of poor patient cooperation or behavior. Summary of the Invention [Problem to be solved by the invention]

[0003] There may therefore be a need for improved means for guiding a subject who is to undergo a medical imaging procedure.The object of the present invention is solved by the subject matter of the independent claims, further embodiments being incorporated in the dependent claims. [Means for solving the problem]

[0004] According to a first aspect, there is provided a method of operating a medical imaging system, the method comprising: determining, by the data processing unit, a positioning rule indicating at least one or more target positions for at least the region of interest, where a deviation between the actual position and the target position may affect imaging performance; - acquiring, by a data processing unit, measurement data of at least the region of interest for deriving an actual position of at least the region of interest; - determining by the data processing unit a current deviation between the actual position of at least the region of interest and the target position by comparing the positioning rule with the acquired measurement data; generating imaging performance information indicating at least whether a current deviation between the actual position of the region of interest and the target position is currently affecting imaging performance in terms of image quality and / or remaining imaging time or is predicted to affect imaging performance in terms of image quality and / or remaining imaging time, The data processing unit provides the generated imaging performance information that is communicated to the subject being imaged.

[0005] In this way, the subject is informed and / or guided, by automatic and / or computational means, by providing the generated imaging performance information to the subject in order to assist him in supporting the medical imaging procedure as positively and as intended as possible. This includes, on the part of the subject, adhering as consistently as possible to predefined plans and / or guidelines for the medical imaging procedure performed on the subject, such as, for example, behavioral guidelines, imaging plans, scanning protocols adapted to the medical imaging procedure performed. The imaging performance information is updated from time to time with respect to content, i.e. periodically updated, so that the subject is guided based on the actual performance of the subject in supporting the medical imaging procedure. Likewise, changes in the subject's performance in supporting the medical imaging procedure are automatically detected and, in response to this change, the imaging performance information is modified or adapted accordingly. This helps in a fast execution of the imaging procedure, which means a high throughput of subjects in the medical imaging facility by providing imaging performance information, allows for an accurate and fast determination of the subject's behavior and also allows, in addition to the qualitative information, quantitative values ​​and / or quantitative measures for the quantitative ones. Furthermore, this facilitates quantitative feedback on how well the subject complies with individual procedural steps during a medical imaging procedure. Feedback on imaging performance, e.g., with respect to image quality and / or remaining imaging time, when considering the subject's positive and / or negative compliance, allows the subject to actively act on or influence the imaging procedure, including the procedure or imaging time, and / or image quality.

[0006] In other words, the imaging performance information is estimated and / or predicted based on the current deviation between actual and target positioning and indicates actual compliance of the subject's performance in supporting a medical imaging procedure with guidelines, plans, and / or protocols etc. for or associated with a planned medical imaging procedure being performed or currently being performed on the subject, where actual compliance is understood as the relationship between the subject's performance and the planned and / or proposed image acquisitions or scans.

[0007] Preferably, the method is implemented by a computer. More preferably, the medical imaging system is operated and / or the medical imaging procedure performed by using the medical imaging system is performed in an autonomous operating mode. This may be a semi-autonomous operating mode, in which one or more, but not all, steps of the imaging procedure are supported by human intervention, e.g. medical staff or technicians, or it may be a fully autonomous operating mode, in which at least the actual medical imaging procedure, and in particular the actual image acquisition, is performed autonomously by the medical imaging system without human intervention. Optionally, the fully autonomous operating mode also concerns one or more steps of a typical imaging procedure, such as subject preparation, by providing automatic guidance to the subject, etc. The medical imaging system may be a magnetic resonance imaging (MRI) system, a magnetic resonance (MR) LINAC system, a PET-MR, or another MR hybrid system.

[0008] As used herein, a positioning rule includes information and / or specifications regarding the workflow of an imaging procedure performed in or on a subject. It includes information regarding how the subject should desirably or ideally behave during one or more steps of the imaging procedure, which steps are also specified in the positioning rule. For example, the positioning rule includes information regarding which positions should be taken, held, and changed by the subject with reference to one or more steps of the imaging procedure. Alternatively or additionally, the positioning rule includes information regarding desired or ideal respiratory behavior, such as which respiratory activity, respiratory inactivity, and / or breathing pattern should be performed by the subject with reference to one or more steps of the imaging procedure. The positioning rule is assigned to a particular region of interest of the subject to be imaged. It is noted that deviations between the subject's actual position and the target position specified in the positioning rules may affect imaging performance, since image quality may degrade, e.g. due to unwanted movement of the subject, displacement from the ideal position, etc., and / or the time required for the imaging procedure may increase, due to repetition of one or more steps of the imaging procedure.

[0009] As used herein, measurement data is acquired by one or more detection means, such as a sensor, a camera, etc. It is assigned to one or more regions of interest that are imaged. A data processing unit processes the measurement data to determine, i.e. derive, the actual position.

[0010] Furthermore, as used herein, the imaging performance information, which is also referred to as imaging performance feedback, is configured to indicate, based on the determined current deviation, how well the subject's behavior meets the requirements of the current step of the imaging procedure, where these requirements are specified in the positioning rules. For example, the imaging performance information includes quantitative feedback, i.e., meaningful figures or images, and / or qualitative feedback related to the subject's current performance in supporting the current step of the imaging procedure. Furthermore, the imaging performance information is determined, e.g., calculated, so as to help the subject, by notification, to change his / her current behavior in a manner that improves the satisfaction of the requirements given in the positioning rules. The imaging performance information further includes a prediction of what imaging performance is expected if the subject's current performance during the imaging procedure (step), such as incorrect positioning and / or movement, is maintained. Furthermore, the effect of the subject's current movement on the image can be realistic, exaggerated, or understated, depending on the actual amount of the subject's movement. This ensures that the quality of the diagrams or images presented for guidance is at a minimum level that enables the subject to at least recognize basic anatomical features in those diagrams or images.

[0011] As used herein, communication of imaging performance information refers to communication to a subject in a manner that is perceptible to the subject, which may include visual, audio, or tactile communication using a respective communication means such as a display, loudspeaker, headphones, etc.

[0012] According to one embodiment, the generated imaging performance information comprises a first indicator relating to a measure of the imaging image quality predicted with the current deviations, e.g. a quantitative or qualitative measure, In other words, the effect of the level or degree of compliance on the image quality is directly indicated to the subject, e.g. by visualization or the like, in order to increase synchronization in compliance with the requirements of the imaging procedure (step).

[0013] In one embodiment, the generated imaging performance information includes a second indicator, e.g. a quantitative or qualitative measure, related to a measure of the remaining and / or total imaging time of imaging predicted using the current deviations and / or the scan time. For example, the predicted scan time is communicated to the subject, e.g. by visualization. In this way, direct feedback, especially by visualization, regarding the overall and respiratory motion can be provided to the subject, representing detailed guidance for the subject on how to best comply.

[0014] According to an embodiment, the generated imaging performance information includes at least one artificial image estimated for the case where the current deviation is not maintained or at least reduced to an acceptable threshold. For this purpose, depending on the level or degree of compliance, one or more images of higher or lower quality are visualized, e.g., displayed, at least in near real time to the subject. This allows the subject to intuitively understand how his current compliance affects the image quality. The subject can understand this mechanism, similar to knowing how stationary one holds a photographic camera, for example, is related to the clarity of the photograph taken. For example, the one or more images are based on data actually acquired from the current subject. For example, the various types of scans can show anatomical details, such as scans using T1 or T2 weighting. This may not be the case for purely functional scans, such as diffusion scans, because such scans are not easily interpretable or recognizable by the lay subject. In these scans, rather anatomical scans of the same body area are displayed. In this way, direct and intuitive feedback, particularly visualization, regarding the overall and respiratory movements can be provided to the subject, representing guidance regarding the best compliance for the subject.

[0015] In one embodiment, the at least one artificial image is estimated from one or more previously recorded images of the same or similar region of interest acquired in a previous subject. Thus, the subject is hardly aware that the one or more images shown, e.g., displayed, to the subject are previously recorded images of the same body part or region of interest acquired in the past from another patient. The one or more images can therefore also be referred to as synthetic images, since they are not actually acquired from the current subject. To synthesize the one or more images, one or more data manipulation techniques known in the art, such as techniques in k-space, are used to determine, e.g., by calculation, an image or a series of images with different levels of motion artifacts from one base image, preferably a high-quality base image. At least one of these images is displayed at a certain point in time, depending on the current level or degree of motion / deviation from the ideal position given in the positioning rule. In this way, it is possible to provide the subject with direct feedback, especially by visualization, on the overall motion and respiratory motion, which represents a detailed guide to the subject on the best compliance.

[0016] According to an embodiment, the generated imaging performance information includes one or more instructions for one or more actions, which are configured to instruct the subject to at least reduce the current deviation by performing one or more actions, i.e. to provide guidance to achieve the target position from the actual position. The one or more instructions are communicated to the subject by one or more of visualization, audio, tactile communication, or the like. For example, it includes commands and / or guidance, according to which at a certain time, e.g. at this moment or immediately, a certain movement, such as a respiratory movement, should be performed, a movement should be avoided, etc. Furthermore, a dynamic display algorithm may focus on the most significant non-compliant behaviors and may provide supporting information and / or guidance to the subject to return, i.e. to increase compliance with the requirements of the imaging procedure. Furthermore, for the synchronization of the respiratory frequency, visual and / or audio signals, e.g. a display with repeated adaptation of the frequency, guide the subject to the target frequency. In this way, the subject can be automatically instructed and / or guided to better comply with the requirements of the imaging procedure, i.e., the positioning rules, allowing for automatic support of the imaging procedure.

[0017] In one embodiment, providing the generated imaging performance information comprises visualizing the imaging performance information for the subject. To this end, the device for performing the method and / or the medical imaging system performing the method is equipped with means for visualization, such as one or more displays or the like. In this way, the imaging performance information can be perceived more clearly or intuitively by the subject and the imaging procedure can be automatically supported.

[0018] According to one embodiment, the imaging performance information is generated with a refresh rate adapted to the current stage of the imaging procedure, i.e. with a refresh rate adapted to the scanning protocol. For example, the imaging performance information is updated from time to time, with the refresh rate being adapted to the overall imaging procedure or to the current step thereof. In this way, the imaging performance information is automatically updated and / or refreshed according to current deviations and / or according to current instructions to reduce current deviations.

[0019] In one embodiment, the measurement data further comprises a measurement of the subject's current respiratory activity, and determining the current deviation between the actual position of at least the region of interest and the target position further takes into account the current deviation caused by the respiratory activity. For example, a device for performing the method and / or a medical imaging system for performing the method comprises suitable detection means for detecting the subject's respiratory activity, e.g. one or more of a respiratory sensor, a camera, an infrared camera, etc. In this way, for example the respiratory depth, the exact timing of stopping breathing, and / or reaching the same respiratory stop position for multiple respiratory stops to acquire images are detected and / or determined, which are factors acting on or influencing the image quality.

[0020] According to one embodiment, the current deviation between the actual position and the target position is determined over a time interval and then averaged before generating the imaging performance information. For example, the degree or level of compliance of the subject is averaged over several seconds to provide an improved consistency in the image or images that are communicated, e.g. visualized, to the subject over time. Still, the image or images can indicate to the subject that his / her actions significantly affect or influence the image quality. In fact, the subject can see in a series of images, as in a video, that the image quality is affected by his / her actions in the last few seconds. Optionally, several adjacent slices of adjacent body parts may be displayed in sequence, possibly as they were acquired in reality, to provide some variation in image content over time. The effect or influence of the subject's movement on the image or images is determined, e.g. calculated, to be realistic, exaggerated or underrepresented, depending on the actual amount of patient movement. This ensures that the image quality is at a minimum level, preferably always, that the subject can at least recognize basic anatomical features in these images.

[0021] In one embodiment, the current deviation is calculated by the data processing unit using at least one motion impact factor that takes into account the impact or degree of impact of a specific movement, a specific type of movement, and / or a specific body part movement of the subject according to the positioning rules, and the motion impact factor is further taken into account by the data processing unit to adjust the representation intensity of the imaging performance information before it is communicated to said subject. In other words, the at least one motion impact factor amplifies and / or emphasizes the position deviation information for communication, such as visualization, to the subject. This real-time feedback emphasizes the position deviation of the body or area of ​​interest from the ideal position and the overall compliance of the subject. Thus, the more significant or most significant deviation is selected as the "feedback focus", since the subject cannot process multiple aspects in parallel.

[0022] For example, at least one motion impact factor is associated with one or more regions of interest, the motion impact factor indicating and / or distinguishing between regions within the one or more regions of interest where the subject's body motion is significant and regions where the subject's body motion is not significant. The degree of significance of a particular region of interest is related to the workflow of the imaging procedure. These regions are estimated and / or determined, for example, based on optical detection of the subject's position, which considers whether motion limited to a particular region, e.g. a body region, of the subject affects a given imaging procedure. This estimation and / or determination is based on a comparison with respective thresholds indicating the degree of motion considered to be acceptable or unacceptable, respectively. Thus, the respective motion impact factors are estimated and / or determined to be large or larger for regions where the motion noticeably affects the image acquisition and less large for regions where the motion barely affects the image acquisition or not significantly, etc. In another example, the patient's breathing can be a further source of motion. Thus, for example, breathing depth, exact timing of breath-holding, and / or reaching the same breath-hold position for multiple breath-holds to acquire images or scan in a repeatable manner may affect one or more factors for image quality. Duty cycle may also be varied over time. Preferably, it is increased slowly over time to gently guide the subject towards greater compliance.

[0023] Furthermore, calculating and / or considering at least one motion impact factor is used by the data processing unit to emphasize, e.g., visually highlight, the respective imaging performance information based on the motion impact factor. For example, information related to less impactful motion is at least emphasized to a lesser extent, whereas information related to more impactful motion is at least emphasized to a greater extent. Emphasizing information includes highlighting the information more strongly to a subject, e.g., in image form, audio, etc., e.g., more easily perceptible or even subjectively stronger, more accentuated, more insistent, etc.

[0024] According to one embodiment, the method is performed during real-time operation of the medical imaging system. For example, in particular, imaging performance information is determined and provided to the subject during real-time operation of the medical imaging system. In this way, the subject is provided with imaging performance information in certain situations, i.e. during the imaging procedure and / or actual image acquisition, where the subject's cooperation and / or involvement affects or is expected to affect image quality.

[0025] In one embodiment, the medical imaging system is selectively operated in an operational imaging mode and a training and / or preparation mode preceding the operational imaging mode and in which imaging has not yet occurred. - during the training mode, by means of a data processing unit, obtaining measurement data of at least the region of interest from which it is possible to derive an actual position of at least the region of interest; - determining, during the training mode, by the data processing unit, a current deviation between the actual position of at least the area of ​​interest and the target position by comparing the positioning rules with the acquired measurement data; determining, during the training mode, by the data processing unit, whether the current deviation is within one or more boundary conditions; During the training mode, the data processing unit communicates to the subject whether the current deviation is within one or more boundary conditions and / or the consequences this may have for the operational imaging mode.

[0026] In other words, during the training and / or preparation phase, the subject can test the method and learn about the results and the acceptance range of his / her behavior and / or cooperation. For example, rather small movements in non-critical areas can be compensated by the medical imaging system, for example by a correction algorithm or the like, and have no significant impact on the imaging procedure or image quality. Rather significant movements in the area of ​​interest can trigger a stop signal that terminates the current image acquisition and may even require or trigger a restart, with a delay and extension in the overall imaging procedure time. Furthermore, boundary conditions for different results related to the subject's behavior and / or cooperation are displayed as different color and / or sound signals, so that the subject learns on the one hand to focus on the most important boundary conditions, but is informed about what its performance during the training phase is and how quickly and / or how the subject adapts and follows guidance, thereby providing an iterative optimization of the imaging procedure. Thus, the data collected during the training and / or preparation phase is used by the data processing unit to optimize the methods and / or algorithms described herein. After an optional training and / or preparation phase, the optimized methods and / or algorithms are applied to the medical imaging system during operational imaging procedures. Visualization of real-world performance and seeing the best possible image quality also helps the subject realize how much improvement is possible.

[0027] According to a second aspect, there is provided a medical imaging system comprising: An imaging device; A data processing unit; and at least one detection device configured to capture at least a portion of the subject imaged by the imaging device, the data processing unit comprising: determining a positioning rule indicating at least one or more target positions, the deviation of which from the actual position may affect imaging performance, at least for the region of interest; obtaining measurement data of at least the region of interest from the at least one detection device, from which an actual position of at least the region of interest can be derived; determining a current deviation between the actual position of at least the region of interest and the target position by comparing the positioning rule with the acquired measurement data; generating imaging performance information indicating at least whether a current deviation between the actual position of the region of interest and the target position is currently affecting or will affect imaging performance; and configured to provide the generated imaging performance information that is communicated to a subject being imaged.

[0028] This provides the same or similar advantages as already discussed with respect to the first embodiment.

[0029] As used herein, a data processing unit is any suitable computing means, such as a processor, a computer or the like. It is provided with one or more of the following: data interfaces, communication interfaces, etc.

[0030] The at least one detection means comprises one or more of a motion detection sensor, a respiration detection sensor, a camera, an infrared camera, or the like. The at least one detection means is operatively connected to at least the data processing unit for providing measurement data thereto.

[0031] The imaging device may be configured for example for MRI, MR LINAC, PET-MR, and other MR-hybrid systems.

[0032] According to an embodiment, the medical imaging system further comprises a machine-to-subject communication device configured to communicate the generated imaging performance information to the subject and to utilize one or more of visual, audio and tactile communication. The communication device is operatively connected to at least the data processing unit for receiving the imaging performance information. For example, the communication device comprises one or more of a display, a loudspeaker, headphones or the like. The imaging performance information is such.

[0033] According to a third aspect, there is provided a computer program element which, when executed by a processor, is configured to perform the method of the first aspect and / or to control a system according to the second aspect.

[0034] According to a fourth aspect, there is provided a computer readable storage or transmission medium, the computer readable storage or transmission medium storing or carrying a computer program element according to the third aspect.

[0035] The above-described embodiments may be combined with each other regardless of the aspect to which they relate, so that this method may be combined with structural features of a system of another aspect, and likewise, this system may be combined with features described above in relation to this method.

[0036] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.

[0037] Exemplary embodiments of the invention are described in the following drawings. [Brief description of the drawings]

[0038] [Figure 1] 1 is a schematic block diagram of a medical imaging system according to one embodiment. [Diagram 2] 1 is a schematic representation of imaging performance information according to one embodiment; [Diagram 3] 1 is a flowchart of a method for operating a medical imaging system according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] FIG. 1 shows, as a schematic block diagram, a medical imaging system 100 that uses Magnetic Resonance Imaging (MRI) technology.

[0040] The medical imaging system 100 comprises an imaging device 110, which may be, for example, an MRI scanner as known in the art. In this exemplary embodiment, the imaging device 110 thus comprises a bore, a radiation source, a detector, etc. The medical imaging system 100 further comprises a data processing unit 120, which is operatively connected to the imaging device 110. It further comprises at least one detection device 130, which is at least configured to capture at least a portion of a subject S, also referred to as a region of interest, which is imaged by the imaging device 110. For example, the at least one detection device 130 is arranged in a room in which the medical imaging system 100 is located and / or inside a bore of the medical imaging system 100. The at least one detection device 130 comprises a camera, an infrared camera, a motion sensor, a respiration detection sensor, or the like. Furthermore, the medical imaging system 100 comprises at least one machine-to-subject communication device 140, which is configured to use one or more of visual, audio, and tactile communication. For example, the at least one communication device 140 comprises one or more of a display or monitor, a loudspeaker, headphones, or the like. It is noted that the communication device 140 may be located inside the bore (as in the example shown in FIG. 1) or may be located outside the bore if the subject S is able to perceive the information provided via the communication device 140.

[0041] In general, the medical imaging system 100 can be operated in a semi-autonomous mode of operation or in a fully autonomous mode of operation, meaning that at least a part of the imaging procedure is performed by using the medical imaging system 100. Due to the degree of automation of the imaging procedure, there is a training or preparation phase for the subject S, in which the subject S is informed of the requirements directed to the subject S, which relate to the behavior of the subject S during the imaging procedure, for example, to stay still, to stay still at a certain step of the imaging procedure, to change its position for a certain step of the imaging procedure, to hold its breathing for a certain time interval and / or during a certain step of the imaging procedure, to breathe in a certain pattern, etc.

[0042] The data processing unit 120 is configured to determine, for example by using suitable calculation procedures and / or algorithms, a positioning rule which indicates at least one or more target positions to be occupied by the subject S, at least with respect to the region of interest, which target positions or target positions comply with the above-mentioned requirements or desired actions directed to the subject S. Thus, deviations between the actual positions and the target positions may affect the imaging performance during the imaging procedure. Thus, the positioning rule comprises information on one or more of the above-mentioned requirements or desired actions. For example, the positioning rule comprises information on compliance with a sequence of steps of the intended imaging procedure.

[0043] Furthermore, the data processing unit 120 is configured to obtain measurement data of at least the region of interest from the at least one detection device 130, from which measurement data of at least the region of interest the actual position can be derived. For example, the measurement data comprises one or more measurements related to a movement of the imaged region of interest, including for example a movement caused by a respiratory activity of the subject S. The measurement data comprises one or more images taken of the subject S, from which a position and / or a change in position meaning a movement of the subject S is derived by means of one or more suitable image analysis techniques. In at least some embodiments, the measurement data comprises a measurement of a current respiratory activity of the subject S, and determining the current deviation between the actual position of at least the region of interest and the target position further takes into account the current deviation caused by this respiratory activity.

[0044] The data processing unit 120 is further configured to determine a current deviation between the actual position of at least the region of interest and the target position by comparing the positioning rules with the acquired measurement data. For example, the positioning rules may include information regarding at what point, e.g. at the time of the imaging procedure, a particular part of the body and / or the region of interest should be located.

[0045] The data processing unit 120 is further configured to generate imaging performance information 121 (see Fig. 2), which at least indicates whether a current deviation between the actual position of the region of interest and the target position is currently affecting or will affect the imaging procedure. This deviation is also understood as a current movement of the subject S that affects the imaging performance. Furthermore, the imaging performance information is generated together with a refresh rate adapted to the imaging procedure, which may depend on the current step of the imaging procedure, the weight of the current deviation with respect to its effect on the imaging procedure, etc.

[0046] Furthermore, the data processing unit 120 is configured to provide the generated imaging performance information 121 (see FIG. 2 ) to be communicated to the subject S. Thus, the generated imaging performance information is communicated by using the communication device 140.

[0047] 2 shows a schematic representation of the imaging capabilities information 121 as it is provided to the subject S via the communication device 140. It should be noted that this representation may be modified with respect to its degree of detail, graphical illustration, etc. The imaging capabilities information 121 may also include other communication technologies, such as audio, haptic, or the like, so that the communication device 140 may instead or additionally be equipped with the respective technical means, such as loudspeakers, headphones, etc.

[0048] In at least some embodiments, the generated imaging performance information 121 includes a first indicator 121A associated with the image quality of the imaging predicted with the current deviation. For example, the image quality may be indicated in a color according to a quality value, e.g. green indicates sufficient image quality, red indicates insufficient image quality, etc. Furthermore, by way of example, in order to graphically indicate and / or clearly indicate the image quality, the generated imaging performance information includes at least one artificial image 121B estimated and / or generated by the data processing unit 120 for the case where the current deviation is maintained or is not at least reduced, e.g. up to an acceptable threshold corresponding to a minimum image quality required. Thus, this at least one artificial image 121B is estimated from one or more previously recorded images of the same or similar region of interest acquired in a previous subject. These one or more images are stored in a memory, a database, or similar (not shown). Moreover, these one or more images may be previously recorded images of the same body part but from one or more other subjects, i.e. not from the subject S currently being examined, a difference that is hardly noticeable to the subject S when looking at the communication device 140. For this purpose, one or more data manipulation techniques in k-space may be used to calculate a series of images with different levels of motion artifacts from a base image of high quality. One of these images will be displayed at a given time depending on the current level of motion and / or deviation from the desired and / or ideal position specified in the positioning rules. Furthermore, the current deviation between the actual position and the target position is determined over a time interval and then averaged before generating the imaging performance information 121, in particular the at least one artificial image 121B. For example, the compliance and / or the level or degree of the determined deviation is averaged, for example, over several seconds, to provide consistency over time in the at least one artificial image 121B. This produces a sequence of images, as in a video, whose quality is influenced by the subject S's actions over the last few seconds.To provide some variation in image content over time, several adjacent slices of adjacent body parts are displayed in sequence, presumably as they would actually be acquired.

[0049] Alternatively or additionally, the generated imaging performance information 121 includes a second indicator 121C associated with a predicted scan time of the imaging procedure using the current deviation, e.g., a remaining scan time until completion of the imaging procedure. For example, the second indicator 121C may be a value, but may optionally be highlighted, e.g., by a color for illustration or the like, to indicate whether the current deviation affects the imaging procedure in a negative or positive manner.

[0050] Furthermore, the generated imaging performance information 121 may include one or more instructions 121D for one or more actions, configured to instruct the subject S to at least reduce a current deviation by performing one or more actions. For example, the one or more instructions 121D may be determined, e.g., calculated, to instruct the subject S to stay still, breathe in a particular pattern, etc.

[0051] Furthermore, the current deviation is calculated using at least one motion impact factor that takes into account the impact of a specific movement, a specific type of movement, and / or a specific body part of the subject according to the positioning rules, and this motion impact factor is further taken into account in order to adjust the presentation intensity of the imaging performance information 121 before it is communicated to the subject S. Based on the at least one motion impact factor, the visualization to the subject S is amplified, for example, emphasized, focused, etc., as shown in FIG. 2 by a rectangle 121E. This real-time feedback highlights the position deviation of the body and / or the region of interest from the ideal position and / or overall compliance. For example, a particularly significant deviation may be selected as a "feedback focus". Further based on this at least one motion impact factor, a dynamic display algorithm may focus on the most significant deviation performance and provide support information for returning, for example by using one or more instructions 121D. This support information or instructions may be different depending on the different ways in which the deviation is present. With regard to the breathing frequency, synchronization by iterative adaptation of the frequency and an amplified audio signal guide the subject S to the target frequency. Furthermore, movements should be displayed in an amplified manner and guidance should be focused on the body area, such as one specific landmark on the knee that should be returned to the target position. The communication device 140 may primarily show simplified information to allow for quick recognition and matching of position supported by audio and / or visual information.

[0052] FIG. 3 illustrates, as a flow chart, a method for operating the medical imaging system 100.

[0053] In step S1, the data processing unit 120 determines a positioning rule, i.e., for example selects a positioning rule that is appropriate for the imaging procedure intended for the subject S and / or is dedicated to the imaging procedure intended for the subject S.

[0054] In step S2, the data processing unit 120 obtains measurement data of at least the region of interest from at least one detection device 130, from which it is possible or possible to derive the real position of at least the region of interest by determining the real position, for example by image analysis techniques, movement sensing, respiration sensing, etc.

[0055] In step S3, the data processing unit 120 determines the current deviation between the actual position of at least the region of interest and the target position by comparing the positioning rules with the acquired measurement data.

[0056] In step S3, the data processing unit 120 generates imaging performance information 121 that indicates at least whether a current deviation between the actual position of the region of interest and the target position is currently affecting imaging performance in terms of image quality and / or remaining imaging time, or is predicted to affect imaging performance in terms of image quality and / or remaining imaging time.

[0057] In step S4, the data processing unit 120 provides the generated imaging performance information which is communicated to the subject S using the communication device 140 by using different communication techniques as one or more options, such as visual, audio, tactile, etc.

[0058] Optionally, as described above, the medical imaging system 100 is selectively operated in a training mode preceding the operational imaging mode. Optionally, the training mode may use other devices (not shown) and / or at least another room separate from the imaging device 110 to perform in parallel the training mode for one subject and the real imaging procedure for another subject. During the training mode, the data processing unit 120 acquires measurement data of at least the region of interest from which a real position of at least the region of interest can be derived. Furthermore, during the training mode, the data processing unit 120 acquires a current deviation between the real position of at least the region of interest and a target position by comparing the acquired measurement data with a positioning rule. Furthermore, during the training mode, the data processing unit 120 determines whether the current deviation is within one or more boundary conditions. Then, during the training mode, the data processing unit 120 communicates, via the communication device 140 or other communication device (not shown), whether the current deviation is within the one or more boundary conditions and / or the consequences this may have for the operational imaging mode. In other words, during the training mode, the subject S can test the above-mentioned method and learn about the results and the acceptance range when deviating from the positioning rules. Thus, the boundary conditions for different results can be displayed with different colors (audio signals), so that the patient, on the one hand, learns to focus on the most important parameters, but can also see how he performs during the training phase and how quickly / how well he can adapt and follow the guidance (iterative optimization). After the training mode, which may also be called the training phase or preparation phase, the optimized algorithm can be applied during the real imaging procedure.

[0059] In another exemplary embodiment, a computer program or a computer program element is provided, characterized in that it is configured to execute, on a suitable system, the steps of the method according to one of the previous embodiments.

[0060] A computer program element is thus stored on a data processing unit, which is also part of the embodiments. The data processing unit is configured to execute or to direct the execution of the steps of the above-mentioned method. Furthermore, it is configured to operate the components of the above-mentioned device and / or system. The computing unit can be configured to operate automatically and / or to execute the instructions of a user. The computer program is loaded into the working memory of the data processor. The data processor is then equipped to perform the invention according to one of the above-mentioned embodiments.

[0061] Moreover, the computer program element may provide all the steps required to implement the procedures of the exemplary embodiments of the methods described above.

[0062] According to a further exemplary embodiment of the present invention, a computer readable medium, such as a CD-ROM, USB stick or similar, is presented, which computer readable medium has stored thereon the computer program elements described by the preceding sections.

[0063] The computer program may be stored and / or distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless remote communication systems.

[0064] However, the computer program may also be presented over a network, such as the World Wide Web, and can be downloaded from such a network into the working memory of a data processor. According to a further exemplary embodiment of the invention, a medium for making available for downloading a computer program element is provided, the computer program element being configured to perform a method according to one of the above-described embodiments of the invention.

[0065] It should be noted that the embodiments of the present invention are described with reference to different subject matters. In particular, some embodiments are described with reference to method type claims, while other embodiments are described with reference to device type claims. However, those skilled in the art will understand from the above and subsequent descriptions that, unless otherwise stated, any combination of features belonging to one subject matter, as well as any combination between features relating to different subject matters, is considered to be disclosed together with the present application. However, all features can be combined, thereby providing a synergistic effect greater than the mere addition of those features.

[0066] While the present invention has been illustrated and described in detail in the drawings and the foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. The present invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the dependent claims.

[0067] In the claims, the word "comprising" does not exclude other elements or steps, and the words "a" or "an" in the singular do not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be interpreted as limiting the scope. [Explanation of symbols]

[0068] 100 Medical imaging system 110 Imaging Device 120 Data Processing Unit 121 Imaging performance information 130 Detection means 140 Communication Devices Sx Method Steps

Claims

1. The data processing unit determines a positioning rule that indicates at least one or more target positions within a region of interest, The data processing unit includes the step of acquiring measurement data of at least the region of interest in order to derive at least the actual position of the region of interest, The data processing unit determines the current deviation between at least the actual position of the region of interest and the target position by comparing the positioning rule with the acquired measurement data, The data processing unit generates imaging performance information that at least indicates whether the current deviation between the actual position and the target position of the region of interest is actually affecting the imaging performance with respect to image quality and / or remaining imaging time, or whether it is predicted to affect the imaging performance with respect to image quality and / or remaining imaging time. The data processing unit provides the generated imaging performance information to be communicated to the subject being imaged. A method for operating a medical imaging system having [a specific feature / feature].

2. The method according to claim 1, wherein the generated imaging performance information includes a first indicator associated with a measure of the image quality of the image predicted using the current deviation.

3. The method according to claim 1 or 2, wherein the generated imaging performance information includes a second indicator related to the scanning time of the imaging predicted using the current deviation.

4. The method according to any one of claims 1 to 3, wherein the generated imaging performance information includes at least one artificial image estimated for the case in which the current deviation is not reduced to at least a threshold that is maintained or acceptable.

5. The method according to claim 4, wherein the at least one artificial image is estimated from one or more previously recorded images of the same or similar region of interest acquired in a previous subject.

6. The method according to any one of claims 1 to 5, wherein the generated imaging performance information includes one or more instructions for one or more actions calculated to be guided from the actual position that causes the current deviation to the target position.

7. The method according to any one of claims 1 to 6, wherein the step of providing the generated imaging performance information comprises the step of visualizing the imaging performance information for the subject.

8. The method according to any one of claims 1 to 7, wherein the imaging performance information is generated using a refresh rate adapted to the current step of the imaging procedure.

9. The method according to any one of claims 1 to 8, wherein the measurement data further includes measuring the subject's current respiratory activity, and the step of determining the current deviation between the actual position and the target position of the region of interest further takes into account the current deviation caused by the respiratory activity.

10. The method according to any one of claims 1 to 9, wherein the current deviation between the actual position and the target position is determined over a time interval and then averaged before generating the imaging performance information.

11. The method according to any one of claims 1 to 10, wherein the current deviation is calculated by the data processing unit using at least one motion impact coefficient that takes into account the impact of a specific movement of the subject, a specific type of movement, and / or movement of a specific body part in accordance with the positioning rules, and further, the data processing unit takes into account the motion impact coefficient to adjust the intensity of the visualization of the imaging performance information before it is communicated to the subject.

12. The medical imaging system operates selectively in a motion imaging mode and a training mode that precedes the motion imaging mode but in which imaging has not yet been performed, and the method further, During the training mode, the data processing unit takes the step of acquiring measurement data of at least the region of interest in order to determine the actual location of the region of interest, During the training mode, the data processing unit determines the current deviation between the actual position of the region of interest and the target position by comparing the positioning rule with the acquired measurement data. During the training mode, the data processing unit determines whether the current deviation is within the range of one or more boundary conditions. During the training mode, the data processing unit communicates to the subject whether the current deviation is within the range of the one or more boundary conditions and / or what results it may have for the motion imaging mode. The method according to any one of claims 1 to 11, comprising:

13. Imaging device and Data processing unit, A medical imaging system comprising at least one detection device configured to capture at least a portion of a subject being imaged by the imaging device, wherein the data processing unit is Determine a positioning rule that specifies at least one or more target positions, with respect to the region of interest, where the deviation from the actual position may affect imaging performance. From at least one detection device, in order to derive the actual position of at least the region of interest, measurement data of at least the region of interest is acquired. The current deviation between the actual position of the region of interest and the target position is determined by comparing the positioning rule with the acquired measurement data. Generate imaging performance information that at least indicates whether the current deviation between the actual position and the target position of the region of interest is currently affecting the imaging performance with respect to image quality and / or remaining imaging time, or will affect the imaging performance. A medical imaging system configured to provide generated imaging performance information to be communicated to the subject being imaged.

14. The medical imaging system according to claim 13, further comprising a communication device between a machine and a subject, configured to communicate the generated imaging performance information to the subject and to utilize one or more of visual communication, audio communication, and tactile communication.

15. A computer program, when executed by a processor, is configured to perform the method described in any one of claims 1 to 11 and / or to control the medical imaging system according to claim 13 or 14.

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