CN113495239B - Imaging method, device and system of medical image - Google Patents
Imaging method, device and system of medical image Download PDFInfo
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Abstract
The application relates to a method, a device and a system for imaging a medical image, wherein the method comprises the following steps: acquiring positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part; calculating the physical position offset of the detected part according to the current physical coordinate and the initial physical coordinate; determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system; calculating the logical position offset of the detected part according to the current logical coordinate and the initial logical coordinate; and judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the medical imaging data acquired again. The method can greatly reduce the generation of artifacts in medical images.
Description
Technical Field
The present application relates to the field of computer technologies, and in particular, to a method, an apparatus, and a system for imaging a medical image.
Background
In the current medical field, magnetic Resonance Imaging (MRI) systems are widely used in clinical lesion analysis due to their advantages of high resolution, multi-aspect thin-layer scanning, and high diagnosis rate for difficult and complicated diseases. In the magnetic resonance scanning process, for example, the head of a subject is scanned, the head of the subject moves due to mental stress or other physiological activities of the subject, so that the magnetic resonance image generates artifacts, and the interpretation result of a doctor is influenced. Therefore, in order to improve the accuracy of the interpretation result of the doctor, the generation of artifacts in the magnetic resonance image should be reduced as much as possible.
In the conventional technology, the head of a subject is usually fixed by a mechanical component, so as to reduce the head movement of the subject, thereby achieving the purpose of reducing artifacts in a magnetic resonance image.
However, the use of mechanical fixation in the conventional technique may cause discomfort to the subject, which may make the subject physically resistant or mentally stressed, thereby causing more serious artifacts in the magnetic resonance image.
Disclosure of Invention
Based on this, it is necessary to provide a method, an apparatus and a system for imaging a medical image, which address the problem in the conventional technology that the adoption of mechanical fixation may cause discomfort to the subject, resulting in more serious artifacts in the magnetic resonance image.
A method of imaging a medical image, the method comprising:
acquiring positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
calculating the physical position offset of the detected part;
determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system;
calculating the logical position offset of the detected part according to the current logical coordinates;
and judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data.
In one embodiment, the determining whether medical imaging data needs to be reacquired based on the physical position offset and the logical position offset includes:
and if the physical position offset is larger than a preset first threshold value and/or the logical position offset is larger than a preset second threshold value, determining that the medical imaging data needs to be acquired again.
In one embodiment, the method further includes:
if the medical imaging data does not need to be collected again, determining a time period corresponding to the collected positioning data;
and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
In one embodiment, motion compensation of medical imaging data acquired during the time period includes:
calculating coordinate variation of the detected part in different directions of the logic coordinate system according to the current logic coordinate and the initial logic coordinate;
and carrying out weighted addition/subtraction processing on the coordinate variation and the medical imaging data acquired in the time period so as to carry out motion compensation.
In one embodiment, the method further includes:
generating a medical image to be quantized by adopting medical imaging data before motion compensation, and quantizing the medical image to be quantized under a preset image quality index to obtain a quantization result;
and obtaining the association relation between the displacement offset and the medical image quality in the current acquisition mode according to the physical position offset, the logical position offset and the quantization result.
In one embodiment, the method further includes:
determining a first pressure coefficient of the positioning air bag according to the physical position offset and the logic position offset, and sending the first pressure coefficient to an inflator pump corresponding to the positioning air bag; wherein the positioning air bag is used for fixing the position of the examined part.
In one embodiment, the method further includes:
and receiving a second pressure coefficient input by a user, and sending the second pressure coefficient to an inflator pump corresponding to the positioning airbag.
An apparatus for imaging a medical image, the apparatus comprising:
the acquisition module is used for acquiring positioning data sent by the positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
the first calculation module is used for calculating the physical position offset of the detected part;
the second calculation module is used for determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between the physical coordinate system and a logical coordinate system in the magnetic resonance imaging system; calculating the logical position offset of the detected part according to the current logical coordinate;
and the imaging module is used for judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data.
A system for imaging medical images, the system comprising: a magnetic resonance apparatus and a computer apparatus; the magnetic resonance equipment comprises a head coil, wherein the inner surface of the head coil is provided with a telescopic structure, the free end of the telescopic structure is connected with a positioning sensor, and the telescopic structure drives the positioning sensor to be close to or far away from a detected part;
the positioning sensor is used for monitoring the position of the detected part in real time and sending the monitored positioning data to the computer equipment; the computer device is to:
acquiring positioning data sent by a positioning sensor, wherein the positioning data comprises the current physical coordinate of a detected part;
calculating the physical position offset of the detected part;
determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system;
and calculating the logical position offset of the detected part according to the current logical coordinates.
In one embodiment, the telescopic structure comprises one or more positioning air bags, and the positioning air bags are driven by an inflator;
the computer device is also used for controlling the inflator to adjust the pressure of the positioning air bag according to the received pressure coefficient.
The imaging method, the imaging device and the imaging system of the medical image can acquire positioning data sent by the positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part, so that the physical position offset of the detected part can be calculated according to the current physical coordinate; determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between the physical coordinate system and a logical coordinate system in the magnetic resonance imaging system; calculating the logical position offset of the detected part according to the current logical coordinate; and judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data. In the method, the position of the detected part of the detected person is monitored by the positioning sensor without adopting a mechanical fixing method, the position has no constraint influence on the detected person, the detected person is not discomfortable to generate rejection, and the possibility of generating serious artifacts can be greatly reduced; and whether medical imaging data needs to be collected again is determined by judging the physical position offset and the logic position offset of the detected part, and when the detected part moves to a larger extent, artifacts in the medical image can be further reduced by collecting the medical imaging data again.
Drawings
FIG. 1 is a schematic diagram showing a configuration of a system to which a method for imaging a medical image is applied in one embodiment;
FIG. 2 is a schematic flow chart diagram of a method of imaging a medical image in one embodiment;
FIG. 3 is a flowchart illustrating a method of imaging a medical image according to another embodiment;
FIG. 4 is a schematic flow chart diagram of a method of imaging a medical image in yet another embodiment;
FIG. 5 is a process diagram of a method of imaging an entire medical image in one embodiment;
FIG. 6 is a block diagram showing the configuration of an imaging apparatus for medical images according to an embodiment;
FIG. 7 is a schematic diagram of an imaging system for medical images in one embodiment;
FIG. 8 is a schematic diagram of a configuration of an imaging system for medical images in another embodiment;
FIG. 9 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Description of reference numerals:
11: a magnetic resonance apparatus; 12: a computer device; 13: a positioning signal acquisition device;
111: a positioning sensor; 112: a telescopic structure; 113: an inflator pump;
114: a head coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The imaging method of the medical image provided by the embodiment of the application can be applied to the imaging system of the medical image shown in fig. 1. Wherein, the system comprises a magnetic resonance device 11 and a computer device 12; the magnetic resonance apparatus 11 is used to perform a magnetic resonance scan of a patient and acquire MRI image data of the patient, and to transmit the acquired imaging data to the computer device 12. May include superconducting magnets, gradient coils, radio frequency transmit coils, radio frequency receive coils, and hospital beds. Wherein the superconducting magnet is used for forming a main magnetic field; the radio frequency transmitting coil is used for executing a radio frequency sequence to transmit radio frequency pulses to excite nuclear spin in a human body; the gradient coil is used to execute a sequence to form a gradient field to phase encode, frequency encode, or the like magnetic resonance signals generated by nuclear spins within the human body; the radio frequency receive coil is used to receive magnetic resonance signals. The magnetic resonance device 11 is also used for acquiring positioning data and other information data of the patient during the scanning process, and sending the data to the computer device 12 for analysis processing. The computer device 12 is adapted to perform the steps in the following method embodiments for implementing a process for improving the quality of the resulting medical image.
In one embodiment, as shown in fig. 2, there is provided a method for imaging a medical image, which is illustrated by applying the method to the computer device in fig. 1, and comprises the following steps:
s101, acquiring positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part.
Specifically, the computer device can acquire positioning data of the detected part sent by the positioning sensor, wherein the positioning sensor is movably arranged on the radio frequency receiving coil and is used for monitoring the position of the detected part in real time to obtain the positioning data of the detected part; because the positioning sensor can monitor the position of the detected part in real time, the computer equipment can also acquire positioning data in real time. Optionally, the computer device may directly obtain the positioning data from the positioning sensor, or may first collect the signal data of the positioning sensor in real time by the positioning signal collecting device, and transmit the signal data to the computer device. Alternatively, the number of the positioning sensors may be multiple, for example, when the head of a patient is scanned, multiple positioning sensors may be disposed on the surface of the head to monitor the positions of multiple regions of the head.
In this embodiment, the physical coordinate system may be set as a plane where a bed (such as a magnetic resonance scanning bed) of the scanning device is located, and when a patient lies on the bed of the scanning device, the physical coordinates of each part of the patient may be determined. Taking the above example as an example, the plurality of positioning sensors may monitor the positions of the plurality of regions of the head, and the positioning data may include the current position coordinates of the plurality of regions of the head, such as the position coordinates of the top of the head, the position coordinates at the temple, and the like.
The radio frequency receiving coil may include a head coil, a leg coil, an ankle coil, an abdomen coil, a spine coil, and the like according to a detection region. In one embodiment, the radio frequency receiving coil is a head coil, the inner surface of the head coil may be provided with a movable telescopic structure, the free end of the movable telescopic structure is provided with a positioning sensor, and the positioning sensor can be close to or far away from the examined part through the movement of the movable telescopic structure. Alternatively, the movable telescopic structure may be driven by electricity or by gas.
In one embodiment, three transmitters are arranged on the magnetic resonance scanning device or on the receiving coil of the magnetic resonance scanning, the positions of the three transmitters are fixed on the magnetic resonance scanning device or on the receiving coil of the magnetic resonance scanning, the positioning sensors arranged on the surface of the head can respectively receive the signals sent by the transmitters, and the coordinate position of each positioning sensor can be determined according to the received signals. Alternatively, the position sensors may also be integrated with a rotation receiver that records the angle of movement of each position sensor relative to the initial position. Further, the direction of movement of the patient's head may be determined from the plurality of movement angles. The coordinate positions of the positioning sensors can be refined according to the moving angle of each positioning sensor relative to the initial position, and the position positioning precision is improved.
S102, calculating the physical position offset of the detected part.
In one embodiment, since the positioning sensor monitors the location of the examined region in real time, the initial physical coordinates of the examined region are known, and the computer device can then calculate the physical location offset based on the current physical coordinates and the initial physical coordinates. Alternatively, the computer device may calculate the physical position offset of the examined region by the euclidean distance formula. For example, assume that the physical coordinate of the examined region acquired by a certain positioning sensor at the current time (t-th time) is (x) t ，y t ，z t ) The initial physical coordinate is (x) 0 ，y 0 ，z 0 ) Then can pass through
Calculating the corresponding physical position offset of the positioning sensor by a formula; if there are multiple positioning sensors, the physical position offsets of each positioning sensor may be averaged and summed to obtain a final physical position offset. Optionally, the computer device may further calculate the physical position offset according to the current physical coordinate and the physical coordinate of the last time.
In another embodiment, the head-surface-arranged positioning sensor may be provided as an accelerometer, which is capable of determining the acceleration of the movement of the head-surface-arranged positioning sensor, which acceleration is quadratic integrated and the distance of movement of the positioning sensor may be determined. Further, the physical position offset amount can be determined based on the calculated movement angle of each of the positioning sensors with respect to the initial position by the aforementioned rotary receiver.
Optionally, the computer device may further perform filtering processing on the positioning data before calculating the physical position offset to filter out high-frequency interference.
S103, determining the current logical coordinate of the detected part according to the current physical coordinate and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system.
Specifically, when the object to be examined is located in the scanning environment of the scanning apparatus, the scanning apparatus may correspond to a logical coordinate system of its own, for example, in the magnetic resonance scanning, a series of scanning parameters may be set, different scanning parameters determine different logical coordinate systems, and a certain mapping relationship, that is, a rotation matrix, exists between the physical coordinate system and the logical coordinate system. The computer device may then determine the current logical coordinates of the examined region from the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system.
And S104, calculating the logical position offset of the detected part according to the current logical coordinates.
In one embodiment, the computer device may calculate the logical position offset of the examined region based on the current logical coordinates and the initial logical coordinates. In another embodiment, the computer device may also calculate the logical position offset of the examined region according to the current logical coordinates and the logical coordinates at the last time. Alternatively, the method of calculating the logical position offset amount may also use an euclidean distance calculation formula.
Optionally, because the logical coordinate system is usually a three-dimensional coordinate system, the computer device may further calculate offsets in three directions along an X axis, a Y axis, and a Z axis respectively according to the current logical coordinate and the initial logical coordinate, divide the offsets in the three directions by the voxel lengths in the corresponding directions respectively to obtain relative offsets in the three directions, and finally calculate the final logical position offset through an euclidean distance formula according to the relative offsets in the three directions. The voxel length in this embodiment is specifically the maximum size of the patient's head in three directions in a logical coordinate system. Of course, the relative offset can also be determined using the FOV size of the patient currently being scanned, specifically: the offset in the three directions is divided by the size of the FOV in the corresponding direction respectively, so that the relative offset in the three directions can be obtained.
And S105, judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data.
Specifically, the computer device determines whether medical imaging data needs to be reacquired based on the obtained physical position offset and logical position offset. Optionally, two thresholds (a first threshold and a second threshold) may be preset, and if the physical position offset is greater than the first threshold, and/or the logical position offset is greater than the second threshold, it is determined that the medical imaging data needs to be reacquired. That is, at this time, the motion amplitude of the examined region is too large, which may cause the generated medical image artifact to be heavy, and the artifact influence caused by the large motion amplitude is compensated by acquiring the medical imaging data again.
Wherein when the medical imaging data needs to be reacquired, the medical image is generated from the reacquired medical imaging data. It should be noted that, if the motion amplitude of the examined region is still determined to be large in the process of reacquiring the medical imaging data, reacquiring is required until the medical imaging data does not need to be reacquired. Optionally, when the medical imaging data needs to be reacquired, the computer device may further trigger an alarm device to perform an alarm prompt to prompt an associated operator to perform the reacquisition.
In the imaging method of a medical image provided by this embodiment, a computer device first obtains positioning data sent by a positioning sensor, and since the positioning data includes a current physical coordinate of a detected part, the computer device can calculate a physical position offset of the detected part according to the current physical coordinate, and determine a current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix; calculating the logical position offset of the detected part according to the current logical coordinates; and finally, judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data. In the method, the position of the detected part is monitored by the positioning sensor without adopting a mechanical fixing method to fix the detected part of the detected person, so that the detected person is not restrained and influenced, the detected person is not discomfortable and resists, and the possibility of generating serious artifacts can be greatly reduced; and whether medical imaging data needs to be collected again is determined by judging the physical position offset and the logic position offset of the detected part, and when the detected part moves to a larger extent, artifacts in the medical image can be further reduced by collecting the medical imaging data again.
In an embodiment, as shown in fig. 3, which is a flowchart illustrating a method for imaging a medical image in another embodiment, this embodiment relates to a specific process of performing motion compensation on medical imaging data by a computer device when the medical imaging data does not need to be acquired again, and optionally, the method further includes:
s201, if the medical imaging data does not need to be collected again, determining a time period corresponding to the collected positioning data.
Specifically, when the physical position offset is not greater than the first threshold and the logical position offset is not greater than the second threshold, it is indicated that the current motion amplitude of the examined part is controllable, and the medical imaging data does not need to be acquired again. Because of the position sensor detects the position of the detected part in real time, the computer equipment can also acquire the time point of acquiring each positioning data, and the time period corresponding to the acquisition of the current positioning data can be determined through the time point of the last positioning data and the time point of the current positioning data.
S202, performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by using the medical imaging data after the motion compensation.
In particular, motion compensation of an image refers to a method of describing the difference between adjacent frames (adjacent here means adjacent in the encoding direction, two frames are not necessarily adjacent in the playing order), and in particular how each small block of the previous frame is describedMove to a position in the current frame. After determining the time period corresponding to the acquired positioning data, the computer device may perform motion compensation on the medical imaging data acquired in the time period, and optionally, as can be seen from the above description of the embodiment, the computer device may calculate, according to the current logical coordinate and the initial logical coordinate, coordinate variation amounts of the detected portion in different directions of the logical coordinate, for example, the current logical coordinate is (x) j ，y j ，z j ) The initial logical coordinate is (x) 0 ’，y 0 ’，z 0 ') and the coordinate variation amounts in different directions are (x) respectively j -x 0 ’)、(y j -y 0 ’)、(z j -z 0 ') and then the computer device performs a weighted addition/subtraction process on the coordinate variation and the medical imaging data acquired during the time period to perform motion compensation. And after the motion compensation is finished, generating a medical image by using the medical imaging data after the motion compensation.
According to the imaging method of the medical image, when the medical imaging data does not need to be acquired again, the computer device determines the time period corresponding to the current acquisition positioning data, performs motion compensation on the medical imaging data acquired in the time period, and generates the medical image by adopting the medical imaging data after the motion compensation. In the method, when the motion amplitude of the detected part is small, in order to avoid the image artifact caused by the detected part, the computer equipment can perform real-time motion compensation on the detected part so as to further reduce the influence of the motion of the detected part on the image.
In one embodiment, the specific process of motion compensation of the medical imaging data by the computer device may include:
first, a database of motion vectors and phase changes of magnetic resonance signals is created, which contains pairs of motion vectors and phase offsets (biases). For example, the database establishment procedure may be performed by performing a single excitation of one slice or a plurality of slices on the detection portion, and generating a physical position offset and a logical position offset respectively at the detection portion during the scanning phase, thereby obtaining the phase offsets of the plurality of sets of magnetic resonance signals. More specifically, during each excitation process, three reference echo signals R1, R2, R3 without phase encoding can be collected, where the three reference echo signals are a first even signal, an odd signal, and a second even signal, and the phase offset between the even signal and the odd signal and the phase offset between the first even signal and the second even signal can be obtained by comparing the phases of the first even signal, the odd signal, and the second even signal. Next, a corresponding phase offset is matched in a database based on the physical position offset and the logical position offset.
Finally, the medical imaging data is phase corrected with the phase offset to obtain motion compensated medical imaging data.
In an embodiment, the influence of the motion amplitude of the examined part on the quality of the medical image can be further evaluated by the physical position offset and the logical position offset, and as shown in fig. 4, optionally, the method further includes:
s301, generating a medical image to be quantized by using the medical imaging data before motion compensation, and quantizing the medical image to be quantized under a preset image quality index to obtain a quantization result.
Specifically, before the medical imaging data is compensated, the computer device may further generate a medical image to be quantized by using the medical imaging data before motion compensation, and set a series of image quality indicators, such as image saturation, contrast, and the like. And then, the computer equipment quantizes the medical image to be quantized under the image indexes by analyzing the medical image to be quantized, such as analyzing based on the pixel point values of the image, so as to obtain a quantization result. Alternatively, the computer device may score the medical image to be quantified under different image quality indexes, and finally sum the scores under different image quality indexes directly, or average, or weighted to obtain a quantification result.
S302, obtaining the association relation between the displacement offset and the medical image quality in the current acquisition mode according to the physical position offset, the logic position offset and the quantization result.
The acquisition mode may be a mode determined according to the set scanning parameters, and may include a scanning sequence category and a scanning mode. For example, the magnetic resonance scan includes a plurality of scan sequences, such as T2W sequence, ADC sequence, etc., and the scan modes include transverse scan, longitudinal scan, head-to-foot scan, foot-to-head scan, etc. And the computer equipment obtains the incidence relation between the displacement offset and the medical image quality in the current acquisition mode through the statistical analysis of the physical position offset, the logical position offset and the quantization result.
For example, assuming that the physical position offset and the logical position offset obtained by the computer device are small during a certain scan, but the quantization result score of the medical image is low, it can be determined that slight movement of the examined part can cause large artifacts in the current acquisition mode, and the scan technician can give an important prompt to the subject to reduce the movement in the subsequent scan in the acquisition mode.
In the imaging method of a medical image provided by this embodiment, the computer device may further generate a medical image to be quantized by using the medical imaging data before motion compensation, and quantize the medical image to be quantized under a preset image quality index to obtain a quantization result; and obtaining the association relation between the position offset and the medical image in the current acquisition mode according to the physical position offset, the logical position offset and the quantization result. Therefore, the influence of the motion of the detected part on the medical images obtained by different sequences and scanning modes can be evaluated, so that a scanning technician can know that the motion of the detected person is required to be reduced as much as possible in which acquisition modes, and the detected person is reminded in an important way, and the image artifacts caused by the motion of the detected person can be further reduced.
In one embodiment, the position of the examined region can be fixed by the aid of a positioning airbag, and the method further comprises the following steps: determining a first pressure coefficient of the positioning airbag according to the physical position offset and the logic position offset, and sending the first pressure coefficient to an inflator pump corresponding to the positioning airbag; wherein the positioning air bag is used for fixing the position of the detected part.
The positioning airbags are used for fixing the positions of detected parts, the number of the positioning airbags can be multiple, the positioning airbags can correspond to the positions of the positioning sensors, after the positioning airbags are inflated, the movement of the detected parts to the direction of the positioning airbags can be reduced, the inflator pump is independent and multi-channel, and the positioning airbags can be independently controlled through pressure coefficients respectively to adjust the pressure of the positioning airbags. The computer device can determine the first pressure coefficient of the target positioning air bag according to the physical position offset and the logical position offset, for example, when the amplitude of the leftward movement of the detected part is larger, the pressure coefficient of the left positioning air bag can be set to be larger so as to reduce the leftward movement of the detected part, and thus the detected part can be fixed in a targeted manner. Alternatively, the computer device may set a scaling factor by which the initial pressure coefficient is multiplied based on the magnitudes of the physical position offset and the logical position offset to obtain the first pressure coefficient.
Optionally, the computer device may further receive a second pressure coefficient input by the user, and send the second pressure coefficient to the inflator corresponding to the positioning airbag. When the examinee does not start scanning, the user can also reduce the pressure coefficient in a self-defined mode so as to improve the comfort of the examinee.
In one embodiment, the procedure of the imaging method for medical images can be seen in the flowchart shown in fig. 5, and the method includes:
s401, acquiring a current physical coordinate sent by a positioning sensor;
s402, calculating the physical position offset of the detected part according to the current physical coordinate and the initial physical coordinate;
s403, determining the current logical coordinate of the detected part according to the current physical coordinate and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; and calculating the logical position offset of the detected part according to the current logical coordinate and the initial logical coordinate.
S404, judging whether medical imaging data needs to be collected again or not based on the physical position offset and the logic position offset;
s405, if so, generating a medical image according to the medical imaging data acquired again;
s406, if not, generating a medical image to be quantized by using the medical imaging data before motion compensation, and quantizing the medical image to be quantized under a preset image quality index to obtain a quantization result so as to obtain an association relation between the displacement offset and the medical image quality in the current acquisition mode;
s407, performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation;
s408, determining a first pressure coefficient of the positioning airbag according to the physical position offset and the logic position offset, and sending the first pressure coefficient to an inflator pump corresponding to the positioning airbag.
For the implementation process and the implementation principle of each step in this embodiment, reference may be made to the description in the above embodiments, which is not described herein again.
It should be understood that although the various steps in the flow diagrams of fig. 2-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 6, there is provided an imaging apparatus of a medical image, including: an acquisition module 21, a first calculation module 22, a second calculation module 23 and an imaging module 24.
Specifically, the obtaining module 21 is configured to obtain positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
a first calculating module 22, configured to calculate a physical position offset of the detected part;
the second calculation module 23 is configured to determine a current logical coordinate of the examined portion according to the current physical coordinate and a rotation matrix between the physical coordinate system and a logical coordinate system in the magnetic resonance imaging system; calculating the logical position offset of the detected part according to the current logical coordinate;
and the imaging module 24 is configured to determine whether medical imaging data needs to be acquired again based on the physical position offset and the logical position offset, and if so, generate a medical image according to the acquired medical imaging data.
The imaging device for medical images provided by this embodiment may perform the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
In one embodiment, the imaging module 24 is specifically configured to determine that the medical imaging data needs to be reacquired if the physical position offset is greater than a preset first threshold and/or the logical position offset is greater than a preset second threshold.
In one embodiment, the apparatus further includes a motion compensation module, configured to determine a time period corresponding to the acquisition positioning data if the medical imaging data does not need to be acquired again; and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
In one embodiment, the motion compensation module is specifically configured to calculate, according to the current logical coordinate and the initial logical coordinate, coordinate variation amounts of the detected portion in different directions of the logical coordinate system; and carrying out weighted addition/subtraction processing on the coordinate variation and the medical imaging data acquired in the time period so as to carry out motion compensation.
In one embodiment, the apparatus further includes a quantization evaluation module, configured to generate a medical image to be quantized by using the medical imaging data before motion compensation, and quantize the medical image to be quantized under a preset image quality index to obtain a quantization result; and obtaining the association relation between the displacement offset and the medical image quality in the current acquisition mode according to the physical position offset, the logic position offset and the quantization result.
In one embodiment, the apparatus further includes a sending module, configured to determine a first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to an inflator corresponding to the positioning airbag; wherein the positioning air bag is used for fixing the position of the examined part.
In one embodiment, the sending module is further configured to receive a second pressure coefficient input by a user, and send the second pressure coefficient to an inflator corresponding to the positioning airbag.
The imaging device for medical images provided by this embodiment may perform the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Specific definitions of the imaging device for medical images can be found in the above definitions of the imaging method for medical images, which are not described herein again. The respective modules in the imaging apparatus for medical images described above may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 7, there is provided an imaging system of medical images, the system comprising: a magnetic resonance apparatus 11 and a computer apparatus 12; the magnetic resonance device 11 comprises a head coil 114, wherein an inner surface of the head coil 114 is provided with a telescopic structure 112, a free end of the telescopic structure 112 is connected with a positioning sensor 111, and the telescopic structure 112 drives the positioning sensor 111 to be close to or far away from a detected part; the positioning sensor 111 is used for monitoring the position of the detected part in real time and sending the monitored positioning data to the computer device 12; the computer device 12 is adapted to perform the steps in the above-described method embodiments. As shown in fig. 7, the head coil 114 has an accommodation space in which the head of the patient can be accommodated.
Alternatively, the telescoping structure 112 may include one or more positioning bladders, which are actuated by an inflator 113; the computer device 12 is also used to control the inflator 113 to adjust the pressure of the positioning bladder based on the received pressure coefficient.
Optionally, as shown in fig. 8, the system may further include a positioning signal collecting device 13 for collecting the positioning data of the positioning sensor 111 in real time and transmitting the data to the computer device 12. When the magnetic resonance apparatus 11 scans the head, at least three positioning sensors 111 are distributed on the surface of the head, and all the positioning sensors 111 are required not to be on one plane; the number of the telescopic structures 112 (i.e. positioning air bags) corresponds to the number and positions of the positioning sensors 111 one by one, one end of the telescopic structure 112 is fixed inside the head coil 114, and the other end is a free end which is connected with the positioning sensors 111. Optionally, the system further comprises an alarm device (not shown in the figure), and the alarm device can perform alarm reminding when the motion amplitude is too large through setting a threshold value.
In one embodiment, a computer device is provided, and the internal structure of the computer device can be as shown in fig. 9. The computer device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of imaging a medical image. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, there is provided a computer device comprising a memory and a processor, the memory storing a computer program that when executed by the processor performs the steps of:
acquiring positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
calculating the physical position offset of the detected part;
determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system;
calculating the logical position offset of the detected part according to the current logical coordinate;
and judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the medical imaging data acquired again.
The implementation principle and technical effect of the computer device provided in this embodiment are similar to those of the method embodiments described above, and are not described herein again.
In one embodiment, the processor when executing the computer program further performs the steps of:
and if the physical position offset is larger than a preset first threshold value and/or the logical position offset is larger than a preset second threshold value, determining that the medical imaging data needs to be acquired again.
In one embodiment, the processor when executing the computer program further performs the steps of:
if the medical imaging data does not need to be collected again, determining a time period corresponding to the collected positioning data;
and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
In one embodiment, the processor when executing the computer program further performs the steps of:
calculating coordinate variation of the detected part in different directions of the logic coordinate system according to the current logic coordinate and the initial logic coordinate;
and carrying out weighted addition/subtraction processing on the coordinate variation and the medical imaging data acquired in the time period so as to carry out motion compensation.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
generating a medical image to be quantized by adopting medical imaging data before motion compensation, and quantizing the medical image to be quantized under a preset image quality index to obtain a quantization result;
and obtaining the association relation between the displacement offset and the medical image quality in the current acquisition mode according to the physical position offset, the logic position offset and the quantization result.
In one embodiment, the processor when executing the computer program further performs the steps of:
determining a first pressure coefficient of the positioning air bag according to the physical position offset and the logic position offset, and sending the first pressure coefficient to an inflator pump corresponding to the positioning air bag; wherein the positioning air bag is used for fixing the position of the examined part.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and receiving a second pressure coefficient input by a user, and sending the second pressure coefficient to an inflator pump corresponding to the positioning airbag.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of the detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
calculating the physical position offset of the detected part;
determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system;
calculating the logical position offset of the detected part according to the current logical coordinate;
and judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the medical imaging data acquired again.
The implementation principle and technical effect of the computer-readable storage medium provided by this embodiment are similar to those of the above-described method embodiment, and are not described herein again.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the physical position offset is larger than a preset first threshold value and/or the logical position offset is larger than a preset second threshold value, determining that the medical imaging data needs to be acquired again.
In one embodiment, the computer program when executed by the processor further performs the steps of:
if the medical imaging data does not need to be collected again, determining a time period corresponding to the collected positioning data;
and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
In one embodiment, the computer program when executed by the processor further performs the steps of:
calculating coordinate variation of the detected part in different directions of a logic coordinate system according to the current logic coordinate and the initial logic coordinate;
and carrying out weighted addition/subtraction processing on the coordinate variation and the medical imaging data acquired in the time period so as to carry out motion compensation.
In one embodiment, the computer program when executed by the processor further performs the steps of:
generating a medical image to be quantized by adopting the medical imaging data before motion compensation, and quantizing the medical image to be quantized under a preset image quality index to obtain a quantization result;
and obtaining the association relation between the displacement offset and the medical image quality in the current acquisition mode according to the physical position offset, the logic position offset and the quantization result.
In one embodiment, the computer program when executed by the processor further performs the steps of:
determining a first pressure coefficient of the positioning airbag according to the physical position offset and the logic position offset, and sending the first pressure coefficient to an inflator pump corresponding to the positioning airbag; wherein, the positioning air bag is used for fixing the position of the detected part.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and receiving a second pressure coefficient input by a user, and sending the second pressure coefficient to an inflator pump corresponding to the positioning airbag.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method of imaging a medical image, the method comprising:
acquiring positioning data sent by a positioning sensor; the positioning sensor is used for monitoring the position of a detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
calculating the physical position offset of the detected part;
determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system;
calculating the logical position offset of the detected part according to the current logical coordinates;
judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the medical imaging data acquired again;
the method further comprises the following steps:
if the medical imaging data does not need to be collected again, determining a time period corresponding to the collection of the positioning data;
and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
2. The method of claim 1, wherein said determining whether medical imaging data needs to be reacquired based on said physical positional offset and said logical positional offset comprises:
and if the physical position offset is greater than a preset first threshold value and/or the logical position offset is greater than a preset second threshold value, determining that the medical imaging data needs to be acquired again.
3. The method of claim 1, wherein motion compensating the medical imaging data acquired over the time period comprises:
calculating coordinate variation of the detected part in different directions of a logic coordinate system according to the current logic coordinate and the initial logic coordinate;
and performing weighted addition/subtraction processing on the coordinate variation and the medical imaging data acquired in the time period to perform motion compensation.
4. The method of claim 1 or 3, further comprising:
generating a medical image to be quantized by adopting medical imaging data before motion compensation, and quantizing the medical image to be quantized under a preset image quality index to obtain a quantization result;
and obtaining the incidence relation between the displacement offset and the medical image quality in the current acquisition mode according to the physical position offset, the logical position offset and the quantification result.
5. The method of claim 1, further comprising:
determining a first pressure coefficient of a positioning air bag according to the physical position offset and the logic position offset, and sending the first pressure coefficient to an inflator pump corresponding to the positioning air bag; wherein, the positioning air bag is used for fixing the position of the detected part.
6. The method of claim 5, further comprising:
and receiving a second pressure coefficient input by a user, and sending the second pressure coefficient to an inflator pump corresponding to the positioning airbag.
7. An apparatus for imaging medical images, the apparatus comprising:
the acquisition module is used for acquiring positioning data sent by the positioning sensor; the positioning sensor is used for monitoring the position of a detected part in real time, and the positioning data comprises the current physical coordinate of the detected part;
the first calculation module is used for calculating the physical position offset of the detected part;
the second calculation module is used for determining the current logical coordinate of the detected part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system; calculating the logical position offset of the detected part according to the current logical coordinate;
the imaging module is used for judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data;
the device also comprises a motion compensation module, a motion estimation module and a motion estimation module, wherein the motion compensation module is used for determining a time period corresponding to the acquisition of the positioning data if the medical imaging data does not need to be acquired again; and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
8. A system for imaging medical images, the system comprising: a magnetic resonance apparatus and a computer apparatus; the magnetic resonance equipment comprises a head coil, wherein the inner surface of the head coil is provided with a telescopic structure, the free end of the telescopic structure is connected with a positioning sensor, and the telescopic structure drives the positioning sensor to be close to or far away from a detected part;
the positioning sensor is used for monitoring the position of the detected part in real time and sending the monitored positioning data to the computer equipment; the computer device is to:
acquiring positioning data sent by the positioning sensor, wherein the positioning data comprises the current physical coordinates of the detected part;
calculating the physical position offset of the detected part;
determining the current logical coordinate of the examined part according to the current physical coordinate and a rotation matrix between a physical coordinate system and a logical coordinate system in a magnetic resonance imaging system;
calculating the logical position offset of the detected part according to the current logical coordinate;
judging whether medical imaging data needs to be acquired again or not based on the physical position offset and the logic position offset, and if so, generating a medical image according to the acquired medical imaging data;
the computer device is further configured to:
if the medical imaging data does not need to be collected again, determining to collect a time period corresponding to the positioning data;
and performing motion compensation on the medical imaging data acquired in the time period, and generating a medical image by adopting the medical imaging data after the motion compensation.
9. A medical image imaging system according to claim 8, wherein the telescopic structure comprises one or more positioning balloons, the positioning balloons being driven by an inflator;
the computer device is also used for controlling the inflator pump according to the received pressure coefficient so as to adjust the pressure of the positioning air bag.
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