CN114795182B - Magnetic resonance imaging artifact eliminating method and related components - Google Patents
Magnetic resonance imaging artifact eliminating method and related components Download PDFInfo
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- CN114795182B CN114795182B CN202210722569.3A CN202210722569A CN114795182B CN 114795182 B CN114795182 B CN 114795182B CN 202210722569 A CN202210722569 A CN 202210722569A CN 114795182 B CN114795182 B CN 114795182B
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
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- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
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Abstract
The invention discloses a magnetic resonance imaging artifact eliminating method and a related component thereof, the scheme relates to the field of magnetic resonance imaging and is used for eliminating artifacts in the magnetic resonance imaging, in the scheme, a navigation echo sequence is firstly utilized to carry out phase identification on data to be imaged, if a patient is judged to be in a motion state, magnetic resonance scanning is carried out on the patient again to update the data to be imaged, and the navigation echo sequence is utilized to carry out phase identification on the updated data to be imaged; and if the patient is judged not to be in the motion state, scanning and imaging processing is carried out on the data to be imaged by utilizing the preset scanning and imaging sequence. In summary, the data to be imaged in the scanning imaging process is determined by performing the magnetic resonance scanning when the patient is not moving, so that artifacts in the generated magnetic resonance imaging can be eliminated, the imaging quality is improved, and the diagnosis of the patient by a doctor is facilitated.
Description
Technical Field
The invention relates to the field of magnetic resonance imaging, in particular to a magnetic resonance imaging artifact eliminating method and related components.
Background
In the process of carrying out magnetic resonance scanning and imaging on a patient, the patient inevitably has a motion phenomenon, the motion not only comprises the autonomous or involuntary motion of muscles of the patient, but also comprises irregular and involuntary motion in a human body, such as respiratory motion, blood vessel pulsation, blood flow, heart pulsation and the like, if the patient is directly subjected to the magnetic resonance scanning imaging under the condition, an artifact-containing image can be obtained, the image resolution of the artifact-containing image is low, the image quality is poor, and the precise identification and diagnosis of a doctor on a focus of the patient are inconvenient.
In conclusion, how to eliminate artifacts in magnetic resonance imaging is an urgent problem to be solved in the art.
Disclosure of Invention
The invention aims to provide a magnetic resonance imaging artifact eliminating method and related components, wherein data to be imaged during scanning imaging processing is determined by magnetic resonance scanning when a patient is not moving, so that artifacts in generated magnetic resonance imaging can be eliminated, the imaging quality is improved, and diagnosis of the patient by a doctor is facilitated.
In order to solve the above technical problem, the present invention provides a magnetic resonance imaging artifact removing method, which includes:
performing phase identification on data to be imaged by using a navigation echo sequence;
if the patient is in a motion state when the patient is judged to be in the magnetic resonance scanning mode to generate the data to be imaged based on the signal output by the navigation echo sequence, the patient is subjected to the magnetic resonance scanning again to update the data to be imaged, and the updated data to be imaged is subjected to phase identification by using the navigation echo sequence;
and if the patient is not in a motion state when the signal output by the navigation echo sequence is used for judging that the patient is subjected to magnetic resonance scanning so as to generate or update the data to be imaged, carrying out scanning imaging processing on the data to be imaged by utilizing a preset scanning imaging sequence.
Preferably, the signal output by the navigation echo sequence includes a standard deviation of a motion indication characteristic quantity output after phase recognition is performed on each numerical value in the data to be imaged;
after the navigation echo sequence is used for carrying out phase identification on the data to be imaged, the method further comprises the following steps:
judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within a threshold range of the motion indication characteristic quantity;
if not, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, performing magnetic resonance scanning on the patient again to update the data to be imaged, performing phase identification on the updated data to be imaged by using the navigation echo sequence, and returning to the step of judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity;
and if so, determining that the patient is not in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged.
Preferably, before performing phase identification on data to be imaged by using the navigator echo sequence, the method further includes:
carrying out pre-adjusting phase identification on each line of the data to be imaged by utilizing the navigation echo sequence;
acquiring a pre-adjusting motion indication characteristic quantity standard deviation and a pre-adjusting motion indication characteristic quantity mean value of each line of the data to be imaged, which are output after the navigation echo sequence is subjected to pre-adjusting phase identification;
scaling a preset threshold value of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence based on the preset motion indication characteristic quantity standard deviation and the preset motion indication characteristic quantity mean value;
judging whether the standard deviation of the pre-adjusted motion indication characteristic quantity is larger than a preset threshold of the scaled motion indication characteristic quantity;
if so, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, replacing the preset scanning imaging sequence according to a sequence replacement instruction sent by a user or replacing the sequence parameter of the preset scanning imaging sequence according to a parameter replacement instruction sent by the user, and returning to the step of performing pre-adjustment phase identification on each line of the data to be imaged by using the navigation echo sequence;
if not, setting the range obtained by calculating the preset threshold of the preset motion indication characteristic quantity after the preset motion indication characteristic quantity mean value plus or minus is zoomed as the threshold range of the motion indication characteristic quantity.
Preferably, before performing pre-conditioning phase identification on each line of the data to be imaged by using the navigator echo sequence, the method further includes:
and determining the preset threshold of the motion indication characteristic quantity corresponding to different preset scanning imaging sequences.
Preferably, determining the preset threshold of the motion indication characteristic quantity corresponding to different preset scanning imaging sequences includes:
s201: controlling the debugging model to move with a preset motion amplitude;
s202: performing magnetic resonance scanning on the debugging model to generate a plurality of lines of debugging data to be imaged;
s203: imaging processing is carried out on each row of the debugging data to be imaged by utilizing the preset scanning imaging sequence so as to output a magnetic resonance debugging image;
s204: judging whether the quality of the magnetic resonance debugging image is within a preset acceptable range, if so, entering step S205, and if not, entering step S206;
s205: increasing the preset motion amplitude, and returning to the step S201;
s206: and determining a motion indication characteristic quantity preset threshold value corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image.
Preferably, before determining the preset threshold of the motion indication feature quantity corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image, the method further includes:
determining characteristic values of each row of the debugging data to be imaged by using the navigation echo sequence;
determining a pre-adjusting motion indication debugging characteristic quantity standard deviation of each row of the to-be-imaged debugging data;
judging whether the standard deviation of the preset motion indication debugging characteristic quantity is within a preset debugging range or not;
if yes, determining a preset threshold value of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image;
and if not, adjusting the sensitivity of the navigation echo sequence, and returning to the step of determining the characteristic value of each row of the to-be-imaged debugging data by using the navigation echo sequence.
Preferably, adjusting the sensitivity of the navigator echo sequence comprises:
adjusting a working interval of the navigator echo sequence to adjust a sensitivity of the navigator echo sequence.
In order to solve the above technical problem, the present invention provides a magnetic resonance imaging artifact removing system, including:
the phase recognition unit is used for carrying out phase recognition on the data to be imaged by utilizing the navigation echo sequence;
the first scanning unit is used for carrying out magnetic resonance scanning on the patient again to update the data to be imaged if the patient is in a motion state when the signal output by the navigation echo sequence is used for judging that the patient is subjected to the magnetic resonance scanning to generate the data to be imaged, and carrying out phase identification on the updated data to be imaged by utilizing the navigation echo sequence;
and the second scanning unit is used for performing scanning imaging processing on the data to be imaged by utilizing a preset scanning imaging sequence if the patient is not in a motion state when the signal output by the navigation echo sequence is used for judging that the patient is subjected to magnetic resonance scanning so as to generate or update the data to be imaged.
In order to solve the above technical problem, the present invention provides a magnetic resonance imaging artifact removing apparatus, including:
a memory for storing a computer program;
a processor for implementing the steps of the magnetic resonance imaging artifact removal method as described above when executing the computer program.
In order to solve the above technical problem, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the magnetic resonance imaging artifact removal method as described above.
The application provides a magnetic resonance imaging artifact eliminating method and related components thereof, the scheme relates to the field of magnetic resonance imaging and is used for eliminating artifacts in the magnetic resonance imaging, in the scheme, a navigation echo sequence is firstly utilized to carry out phase identification on data to be imaged, if a patient is judged to be in a motion state, magnetic resonance scanning is carried out on the patient again to update the data to be imaged, and the navigation echo sequence is utilized to carry out phase identification on the updated data to be imaged; and if the patient is judged not to be in the motion state, scanning and imaging processing is carried out on the data to be imaged by utilizing the preset scanning and imaging sequence. In summary, the data to be imaged in the scanning imaging process is determined by performing the magnetic resonance scanning when the patient is not moving, so that artifacts in the generated magnetic resonance imaging can be eliminated, the imaging quality is improved, and the diagnosis of the patient by a doctor is facilitated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a magnetic resonance imaging artifact removing method according to the present invention;
FIG. 2 is a schematic diagram of an artifact-containing image in the prior art;
FIG. 3 is a schematic diagram of another artifact-containing image of the prior art;
FIG. 4 is a schematic diagram illustrating the phase change of a signal to be imaged when a patient moves according to the present invention;
fig. 5 is a flowchart illustrating a magnetic resonance imaging artifact removing method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a magnetic resonance imaging artifact removing system provided by the present invention;
fig. 7 is a schematic structural diagram of a magnetic resonance imaging artifact removing apparatus provided by the present invention.
Detailed Description
The core of the invention is to provide a magnetic resonance imaging artifact eliminating method and related components, wherein data to be imaged during scanning imaging processing is determined by magnetic resonance scanning when a patient is not moving, so that artifacts in generated magnetic resonance imaging can be eliminated, the imaging quality is improved, and diagnosis of the patient by a doctor is facilitated.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a magnetic resonance imaging artifact removing method provided by the present invention, including:
s11: performing phase identification on data to be imaged by using a navigation echo sequence;
in this embodiment, considering that, during the magnetic resonance scanning and imaging of the patient, the patient inevitably has a motion phenomenon, which includes not only the voluntary or involuntary movement of muscles thereof, but also irregular and involuntary movements in the human body, such as respiratory movement, blood pulsation, blood flow, heart pulsation, etc., in this case, directly performing the magnetic resonance scanning and imaging may obtain an artifact-containing image, where the image resolution and the image quality of the artifact-containing image are both low, which affects the precise identification and diagnosis of the focus of the patient by the doctor according to the magnetic resonance imaging.
It should be noted that motion artifacts are caused by "phase mismatch" due to irregular and unintentional motion of the human body in the magnetic resonance imaging technique, because protons in motion and static tissues are subjected to different phase shifts under the action of the magnetic field, thereby causing spatial incorrect positions during phase encoding. The principle of the magnetic resonance imaging technology is as follows: the human body contains a large amount of H protons, the H protons in the human body do random disordered spin motion in a normal state, and when a strong magnetic field is applied to human tissues, the H protons take into account spin and two motions pointing to the direction of the magnetic field or the opposite direction, which are called precession, and the proton precession generates magnetic vectors. At this time, when a radio frequency signal having the same frequency as the spin frequency of the proton is applied, energy transfer occurs, resonance occurs, and the low-energy proton acquires energy and transits to a high-energy state. After the application of the radio frequency pulse is stopped, the resonant H atoms can be slowly restored to the original direction and amplitude, the process is called relaxation, the energy released by the excited protons in the restoration process is a magnetic resonance signal, and the computer receives the magnetic resonance signal and processes the magnetic resonance signal to obtain a magnetic resonance image.
On the basis of superposition of signals emitted by magnetic resonance, the signals cause spatial shift of data to be imaged when Fourier transform is performed. In this way, in the case of spatial errors in the data to be imaged, discontinuous stripes and arc shadows appear in the corresponding phase encoding direction. In addition, high signal overlap is caused by high-intensity motion of moving tissues, so that the definition of continuous edges in corresponding phase encoding directions is reduced, and motion artifacts occur.
The motion artifact is an image with reduced image quality due to the fact that the magnetic resonance imaging is actually deviated from the human tissue due to the influence of certain factors during the magnetic resonance scanning or the information processing process. Motion artifacts are unavoidable during magnetic resonance scanning, which typically occur under involuntary and irregular movements of the body, and the frequency of motion artifacts increases during periodic physiological and aperiodic movements of organs of the body. The motion may be random or periodic, and the more regular and predictable the motion (e.g., breathing), the easier it is to employ certain techniques to reduce the motion effect. Due to the spatial localization of the signals during the magnetic resonance scan, motion artifacts are most severe in the phase encoding direction, since even small changes in the tissue position lead to phase errors (increased or decreased phase dispersion) and thus to an erroneous picture of the spatial localization on the scanner ("phase mismatch"). Therefore some ghosting due to phase mismatch is unavoidable (e.g. ghosting from aorta), and if it covers the region of interest, swapping the phase encoding and frequency encoding directions will shift the position of the artifact so that the region of interest is not occluded. Applying a saturation zone on a large vessel, gastrointestinal tract or artifact source will invalidate the signal from the tissue and may also reduce the artifact.
Motion-related artifacts can be largely classified into the following three types: (1) gross motion of the patient (random motion); (2) normal physiologically induced macro-motility (e.g. cardiac, respiratory, gastrointestinal motility); (3) micro-motion (flow and diffusion effects). For autonomous motion or patient-voluntary motion, due to its strong randomness and no fixed frequency, the artifact appears as image blur, or some streak artifacts appear in the phase encoding direction, or there are significant layers and dislocations, as shown in fig. 2, fig. 2 is a schematic diagram of an artifact-containing image in the prior art.
For physiological periodic motion, streak artifacts, such as blood vessel pulsation artifacts, appear in the phase encoding direction, and sometimes appear continuously at equal intervals, as shown in fig. 3, which is a schematic diagram of another artifact-containing image in the prior art.
The prior art generally adopts a respiratory gating technology to eliminate artifacts, the respiratory gating technology is a technology for reducing motion respiratory artifacts by using detected respiratory waves, the technology mainly comprises respiratory compensation and respiratory triggering technologies, an elastic respiratory belt or a respiratory pressure pad is generally placed at the chest and abdomen part of a patient, the two devices both belong to a pressure detection sensor, the chest and abdomen wall motion caused by respiration can change the internal pressure of the detection sensor, the pressure is increased during inspiration, the pressure is reduced during expiration, a period of breath holding time is provided from the end of one expiration to the next inspiration, and the respiratory triggering technology is used for reducing the respiratory motion artifacts by acquiring MR signals in the breath holding time period.
However, the prior art using respiratory gating techniques has certain limitations, such as: 1) the patient is required to inhale, exhale and hold his breath as dictated by the machine speech, calculated as the time to scan a sequence, typically about 10 seconds (to control the scan efficiency, for a 256 x 256 pixel image, the scan time is controlled to be within 10 minutes, the sequence ETL is 10, TR is 4 seconds, the single line data acquisition time is 10 x 60/4/256 x 10=5.86 seconds, since the sequence is scanned only during the plateau of the patient's breath hold, the breath hold time is about 10 seconds). A breath-hold time of 10 seconds may be difficult to achieve for some patients; 2) because the method prevents the artifacts by regulating the respiration of the patient, the method can only eliminate the motion artifacts generated by respiration and is not suitable for other types of motion artifacts; 3) since the method is performed by voice-controlled patients, it is not suitable for children, comatose patients, and hearing impaired patients.
In order to solve the technical problem, in the present application, a navigation echo sequence is set for eliminating an artifact in magnetic resonance imaging, before a preset scanning imaging sequence is used for performing scanning imaging processing on data to be imaged, phase identification is performed on the data to be imaged by the navigation echo sequence, if a phase in the data to be imaged meets a requirement, it can be determined that a patient does not have a motion which can cause the artifact in magnetic resonance imaging when the patient performs magnetic resonance scanning to generate the data to be imaged, and if the phase in the data to be imaged does not meet the requirement after the navigation echo sequence performs phase identification on the data to be imaged, it can be determined that the artifact in magnetic resonance imaging can be caused by the motion of the patient.
It should be noted that, referring to fig. 4, fig. 4 is a schematic diagram of a phase change of a signal to be imaged during a patient movement, it can be seen that before the movement is triggered, a signal phase is kept stable, after the 300us movement starts, the signal phase is obviously raised compared with that before the movement starts, and a navigator echo sequence can perform phase identification based on the signal phase, so as to determine whether the patient moves.
S12: if the patient is in a motion state when the patient is judged to be in the magnetic resonance scanning mode to generate the data to be imaged based on the signal output by the navigation echo sequence, the patient is subjected to the magnetic resonance scanning again to update the data to be imaged, and the updated data to be imaged is subjected to phase identification by using the navigation echo sequence;
in this embodiment, the determination of whether the patient is in the motion state can be performed according to the signal output by the navigator echo sequence, and if it is determined that the patient is in the motion state when the magnetic resonance scanning is performed on the patient to generate the data to be imaged, it can be determined that the preset scan imaging sequence cannot be used for performing scan imaging processing on the current data to be imaged, otherwise, the generated magnetic resonance imaging contains artifacts, but the patient is scanned again by magnetic resonance to update the data to be imaged, the navigation echo sequence carries out phase recognition on the updated data to be imaged again, if the patient is still judged to be in a motion state when the patient is scanned by magnetic resonance to update the data to be imaged, the magnetic resonance scan is again performed on the patient to update the data to be imaged until the patient is not in motion when the signal output based on the navigator echo sequence determines that the magnetic resonance scan is performed on the patient to update the data to be imaged.
S13: and if the patient is not in a motion state when the signal output based on the navigation echo sequence is used for judging that the patient is subjected to magnetic resonance scanning so as to generate or update the data to be imaged, carrying out scanning imaging processing on the data to be imaged by utilizing a preset scanning imaging sequence.
When the patient is not in a motion state when the signal output based on the navigation echo sequence is judged to carry out magnetic resonance scanning on the patient to generate or update the data to be imaged, the current data to be imaged can be determined to be subjected to scanning imaging processing by using a preset scanning imaging sequence, and the generated magnetic resonance imaging does not contain artifacts, so that a doctor can accurately identify and diagnose the focus of the patient according to the magnetic resonance imaging.
It should be noted that, in the present application, when the navigation echo sequence is used to perform phase identification on the data to be imaged and determine that the patient is not in a motion state, the preset scanning imaging sequence is used to perform scanning imaging processing on the data to be imaged once, and then the navigation echo sequence is used to perform phase identification on subsequent data to be imaged, so as to ensure that the magnetic resonance imaging obtained after the preset scanning imaging sequence is used to perform scanning imaging processing on the data to be imaged does not contain artifacts each time.
Therefore, the navigation echo sequence of the invention can judge whether the patient has motion behavior during scanning the data to be imaged, so the method has universality and is suitable for all types of motion artifacts. And the application does not need patient cooperation in the implementation process, and is suitable for all types of patient groups. Particularly, in the interventional magnetic resonance treatment process, patients often need anesthesia and cannot be matched with instructions of respiratory gating, and the mode in the application can inhibit respiratory artifacts.
In summary, in the present application, the data to be imaged during the determination of the scan imaging processing by using the navigator echo sequence is determined by performing the magnetic resonance scan when the patient is not moving, so that the artifact in the generated magnetic resonance imaging can be eliminated, the imaging quality is improved, and the diagnosis of the patient by the doctor is facilitated.
On the basis of the above-described embodiment:
referring to fig. 5, fig. 5 is a flowchart illustrating a method for removing artifacts in magnetic resonance imaging according to an embodiment of the present invention.
As a preferred embodiment, the signal output by the navigator echo sequence includes a standard deviation of a motion indication characteristic quantity output after phase recognition is performed on each numerical value in data to be imaged;
after the navigation echo sequence is used for carrying out phase identification on the data to be imaged, the method further comprises the following steps:
judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity;
if not, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, performing magnetic resonance scanning on the patient again to update the data to be imaged, performing phase identification on the updated data to be imaged by using the navigation echo sequence, and returning to the step of judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity;
and if so, judging that the patient is not in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged.
In the embodiment, after the navigation echo sequence is used for carrying out phase identification on the data to be imaged, the signal output by the navigation echo sequence comprises the standard deviation of the motion indication characteristic quantity output after the phase identification is carried out on each numerical value in the data to be imaged, because the data to be imaged comprises a plurality of numerical values, the navigation echo sequence respectively outputs the motion indication characteristic quantity corresponding to each numerical value after carrying out phase identification on each numerical value, but in order to completely represent the state of the whole data to be imaged, the standard deviation of the motion indication characteristic quantity of the data to be imaged is directly output, so as to judge whether the standard deviation of the motion indication characteristic quantity of the whole data to be imaged is within the threshold range of the motion indication characteristic quantity or not, so as to directly judge whether the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, the method and the device can improve the efficiency of generating the magnetic resonance imaging and ensure that the magnetic resonance imaging generated according to the data to be imaged does not contain artifacts.
In addition, if it is determined that the patient is in a motion state when the magnetic resonance scan is performed on the patient to generate the data to be imaged, after the magnetic resonance scan is performed on the patient again to update the data to be imaged and the navigation echo sequence is used to perform phase identification on the updated data to be imaged, the step of determining whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity needs to be returned until it is determined that the patient is not in the motion state when the magnetic resonance scan is performed on the patient to generate the data to be imaged, and then the magnetic resonance imaging without artifacts can be generated.
Note that, in determining the motion indicating feature amount, the determination may be made by the following formula:
wherein the movement indicates the characteristic quantity
For signals detected after a specific temporal and spatial distribution of the magnetic field after excitation with radio frequency,
for coil sensitivity and spatial distribution of the radio frequency field,
in order to be the spin density,
is the volume of the radio frequency field,
in order to be able to determine the relaxation time,
in order to obtain the magnetic induction intensity,
is a gyromagnetic ratio, about 42.58MHz,
as a matter of time, the time is,
is a time independent variable and is used as a time independent variable,
is a radius independent variable. In general, phase is more sensitive to motion, and therefore phase information is often used.
As a preferred embodiment, before performing phase identification on data to be imaged by using a navigator echo sequence, the method further includes:
carrying out pre-adjustment phase identification on each line of data to be imaged by using a navigation echo sequence;
acquiring a pre-adjusting motion indication characteristic quantity standard deviation and a pre-adjusting motion indication characteristic quantity mean value of each line of data to be imaged, which are output after a navigation echo sequence is subjected to pre-adjusting phase identification;
scaling a preset threshold value of the motion indication characteristic quantity corresponding to a preset scanning imaging sequence based on the preset motion indication characteristic quantity standard deviation and the preset motion indication characteristic quantity mean value;
judging whether the standard deviation of the preset motion indication characteristic quantity is larger than a preset threshold of the zoomed motion indication characteristic quantity;
if so, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate data to be imaged, replacing the preset scanning imaging sequence according to a sequence replacement instruction sent by a user or replacing sequence parameters of the preset scanning imaging sequence according to a parameter replacement instruction sent by the user, and returning to the step of carrying out pre-adjustment phase identification on each line of data to be imaged by using the navigation echo sequence;
if not, setting a range obtained by calculating the preset threshold of the motion indication characteristic quantity after the pre-adjustment of the mean value of the motion indication characteristic quantity plus or minus zooming as a threshold range of the motion indication characteristic quantity.
In this embodiment, when a pixel with 256 × 256 pixels is generated, 256 lines of data to be imaged need to be scanned, and each line of data to be imaged includes 256 numerical values, and when it is determined that a patient corresponding to one line of data to be imaged is not in a motion state, the preset scanning imaging sequence may be used to perform scanning imaging processing on the line of data to be imaged.
In order to ensure that a navigation echo sequence can accurately determine whether a patient corresponding to each line of data to be imaged is in a motion state, a navigation echo sequence is firstly utilized to perform pre-adjustment phase identification on each line of data to be imaged, so as to obtain pre-adjustment motion indication characteristic quantity standard deviation and pre-adjustment motion indication characteristic quantity mean value of each line of data to be imaged, which are output after the pre-adjustment phase identification is performed on the navigation echo sequence, as each pre-adjustment scanning imaging sequence is respectively provided with a motion indication characteristic quantity preset threshold value corresponding to the pre-adjustment scanning imaging sequence, in order to match the motion indication characteristic quantity preset threshold value with the resolution of the current data to be imaged, the motion indication characteristic quantity preset threshold value corresponding to the pre-adjustment scanning imaging sequence is scaled based on the pre-adjustment motion indication characteristic quantity standard deviation and the pre-adjustment motion indication characteristic quantity mean value, and whether the pre-adjustment motion indication characteristic quantity standard deviation is larger than the scaled motion indication characteristic quantity preset threshold value is judged, if the number of the preset scanning imaging sequences is larger than the preset number, the fact that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged can be directly judged, and the reason of the result can be that the selected preset scanning imaging sequence is not appropriate, or the parameter setting of the preset scanning imaging sequence is not appropriate, at the moment, a user can replace the preset scanning imaging sequence, or change the series parameters of the preset scanning imaging sequence, and perform pre-adjustment phase recognition on each line of data to be imaged by reusing the navigation echo sequence, and judge whether the selected preset scanning imaging sequence is appropriate or the setting of the sequence parameters of the preset scanning imaging sequence is appropriate again.
If the preset motion indication characteristic quantity standard deviation is not larger than the preset threshold of the zoomed motion indication characteristic quantity, the condition that the currently selected preset scanning imaging sequence is proper or the sequence parameter setting of the preset scanning imaging sequence is proper can be judged, the condition that whether the patient is in a motion state or not when the patient is subjected to magnetic resonance scanning to generate the data to be imaged can be judged, and the range obtained by calculating the preset motion indication characteristic quantity mean value +/-the preset threshold of the zoomed motion indication characteristic quantity is set as the threshold range of the motion indication characteristic quantity.
In summary, in the embodiment, it can be avoided that the magnetic resonance image contains artifacts due to the problem of selecting the preset scanning imaging sequence or the problem of setting the sequence parameters of the preset scanning imaging sequence.
As a preferred embodiment, before performing the pre-adjustment phase identification on each line of data to be imaged by using the navigator echo sequence, the method further includes:
and determining the preset threshold values of the motion indication characteristic quantities corresponding to different preset scanning imaging sequences.
Because each preset scanning imaging sequence respectively corresponds to a respective preset threshold value of the motion indication characteristic quantity, the preset threshold values of the motion indication characteristic quantity corresponding to different preset scanning imaging sequences need to be determined before the navigation echo sequence is used for carrying out pre-adjustment phase identification on each line of data to be imaged, so that whether the currently selected preset scanning imaging sequence is proper or whether the setting of the sequence parameters is proper is judged, and the selection is more convenient for a subsequent user to change the preset scanning imaging sequence according to the preset threshold values of the motion indication characteristic quantity corresponding to different preset scanning imaging sequences.
As a preferred embodiment, determining the preset threshold of the motion indication feature quantity corresponding to different preset scanning imaging sequences includes:
s201: controlling the debugging model to move with a preset motion amplitude;
s202: performing magnetic resonance scanning on the debugging model to generate a plurality of lines of debugging data to be imaged;
s203: imaging processing is carried out on each row of debugging data to be imaged by utilizing a preset scanning imaging sequence so as to output a magnetic resonance debugging image;
s204: judging whether the quality of the magnetic resonance debugging image is within a preset acceptable range, if so, entering step S205, and if not, entering step S206;
s205: increasing the preset motion amplitude, and returning to the step S201;
s206: and determining a preset threshold value of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image.
In this embodiment, when determining the preset threshold of the motion indication characteristic quantity corresponding to different preset scanning imaging sequences, specifically, a debugging model is set first, the debugging model is controlled to move according to a preset motion amplitude, magnetic resonance scanning is performed on the debugging model at the same time, multiple lines of debugging data to be imaged are generated, imaging processing is performed on the debugging data to be imaged by using the preset scanning imaging sequences, so as to output a magnetic resonance debugging image, if the quality of the magnetic resonance debugging image is within a preset acceptable range, the preset motion amplitude is increased, and it is determined whether the magnetic resonance debugging image determined after the preset motion amplitude is increased is within the preset acceptable range again until the magnetic resonance debugging image is no longer within the preset acceptable range, so that the preset threshold of the motion indication characteristic quantity of the preset scanning imaging sequence can be determined.
It should be noted that, when setting the preset motion amplitude, it is preferable to go from a small amplitude to a large amplitude, so as to determine the threshold value of the motion amplitude corresponding to the preset scanning imaging sequence.
As a preferred embodiment, before determining the preset threshold of the motion indication feature quantity corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image, the method further includes:
determining characteristic values of each row of debugging data to be imaged by using the navigation echo sequence;
determining a preset motion indication debugging characteristic quantity standard deviation of each row of to-be-imaged debugging data;
judging whether the standard deviation of the preset movement indication debugging characteristic quantity is within a preset debugging range or not;
if yes, determining a motion indication characteristic quantity preset threshold value corresponding to a preset scanning imaging sequence based on the magnetic resonance debugging image;
and if not, adjusting the sensitivity of the navigation echo sequence, and returning to the step of determining the characteristic value of each row of debugging data to be imaged by using the navigation echo sequence.
If the quality of the magnetic resonance debugging image is not within the preset acceptable range, a preset threshold value of a motion indication characteristic quantity corresponding to a preset scanning imaging sequence needs to be determined based on the magnetic resonance debugging image, and in order to avoid the condition that the characteristic value of the data to be debugged is not accurate enough due to the self reason of a navigation echo sequence, the characteristic value of each row of data to be debugged is determined by using the navigation echo sequence, the preset motion indication debugging characteristic quantity standard deviation of each row of data to be debugged is determined, then whether the preset motion indication debugging characteristic quantity standard deviation is within the preset debugging range is judged, if the accuracy of the navigation echo sequence can be determined to be higher in the preset debugging range, the preset threshold value of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence can be directly determined by the magnetic resonance debugging image, and if the preset debugging range is not, the sensitivity of the navigation echo sequence needs to be adjusted, and determining the characteristic value of each row of debugging data to be imaged by using the navigation echo sequence with the adjusted sensitivity.
It should be noted that, when the preset threshold of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence is determined based on the magnetic resonance debugging image, the navigation echo sequence may be used to perform phase identification on the to-be-imaged debugging data corresponding to the magnetic resonance debugging image, so as to determine the preset threshold of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence. As a preferred embodiment, adjusting the sensitivity of the navigator echo sequence comprises:
and adjusting the working interval of the navigation echo sequence so as to adjust the sensitivity of the navigation echo sequence.
In this embodiment, when the sensitivity of the navigation echo sequence is adjusted, the adjustment is specifically realized by adjusting the working interval of the navigation echo sequence, so as to avoid that the motion indication characteristic quantity preset threshold value corresponding to the preset scanning imaging sequence cannot be accurately determined due to the problem of the navigation echo sequence itself.
In addition, the sensitivity of the navigation echo sequence to the position change of the object can be improved by prolonging the time interval between excitation and detection, increasing the magnetic field inhomogeneity (applying a gradient magnetic field in a specific direction or biasing a shimming coil current), selectively exciting, using signals of partial channels of a multi-channel coil, and the like; the sensitivity of the navigation echo sequence to the position change of the object is reduced by shortening the time interval between excitation and detection, increasing the uniformity of a magnetic field, averaging signals and the like.
In conclusion, the navigation echo sequence has the following characteristics: the use time is short; for an object with a constant position, the generated signal is stable, and for an object with a variable position, the generated signal is changed, so that whether the patient moves or not can be judged based on the change; the data to be imaged is not changed, so that the scanning of the subsequent data to be imaged is not influenced.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a magnetic resonance imaging artifact removing system provided in the present invention, the system includes:
the phase recognition unit 61 is used for performing phase recognition on the data to be imaged by using the navigation echo sequence;
the first scanning unit 62 is configured to perform magnetic resonance scanning on the patient again to update the data to be imaged if it is determined that the patient is in a motion state when the patient is subjected to the magnetic resonance scanning to generate the data to be imaged based on the signal output by the navigator echo sequence, and perform phase identification on the updated data to be imaged by using the navigator echo sequence;
and a second scanning unit 63, configured to perform scanning imaging processing on the data to be imaged by using a preset scanning imaging sequence if it is determined that the patient is not in a motion state when performing magnetic resonance scanning on the patient to generate or update the data to be imaged based on the signal output by the navigator echo sequence.
For the introduction of the magnetic resonance imaging artifact removing system provided by the present invention, please refer to the above method embodiment, and the present invention is not repeated herein.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a magnetic resonance imaging artifact removing apparatus provided in the present invention, the apparatus includes:
a memory 71 for storing a computer program;
a processor 72 for implementing the steps of the magnetic resonance imaging artifact removal method as described above when executing the computer program.
For the introduction of the magnetic resonance imaging artifact removing device provided by the present invention, please refer to the above method embodiment, and the present invention is not repeated herein.
The computer readable storage medium in the present invention has stored thereon a computer program which, when being executed by the processor 72, carries out the steps of the magnetic resonance imaging artifact removal method as described above.
For the introduction of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments, which are not repeated herein.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for artifact removal in magnetic resonance imaging, comprising:
performing phase identification on data to be imaged by using a navigation echo sequence;
if the patient is in a motion state when the patient is judged to be in the magnetic resonance scanning mode to generate the data to be imaged based on the signal output by the navigation echo sequence, the patient is subjected to the magnetic resonance scanning again to update the data to be imaged, and the updated data to be imaged is subjected to phase identification by using the navigation echo sequence;
if the patient is not in a motion state when the patient is judged to be subjected to magnetic resonance scanning to generate or update the data to be imaged based on the signal output by the navigation echo sequence, carrying out scanning imaging processing on the data to be imaged by using a preset scanning imaging sequence;
the signal output by the navigation echo sequence comprises a standard deviation of a motion indication characteristic quantity output after phase identification is carried out on each numerical value in the data to be imaged;
after the navigation echo sequence is used for carrying out phase identification on the data to be imaged, the method further comprises the following steps:
judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within a threshold range of the motion indication characteristic quantity;
if not, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, re-performing the magnetic resonance scanning on the patient to update the data to be imaged, performing phase identification on the updated data to be imaged by using the navigation echo sequence, and returning to the step of judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity;
if so, determining that the patient is not in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged;
the calculation formula of the motion indication characteristic quantity is as follows:
wherein the movement indicates a characteristic quantity
For signals detected after a specific temporal and spatial distribution of the magnetic field after excitation with radio frequency,
for the coil sensitivity and the spatial distribution of the radio frequency field,
in order to be the spin density,
is the volume of the radio frequency field,
in order to be able to determine the relaxation time,
in order to obtain the magnetic induction intensity,
is a gyromagnetic ratio, about 42.58MHz,
as a matter of time, the time is,
is a variable of the time-dependent variable,
is a radius independent variable.
2. The magnetic resonance imaging artifact reduction method as set forth in claim 1, wherein before the phase identifying the data to be imaged by using the navigator echo sequence, the method further comprises:
carrying out pre-adjusting phase identification on each line of the data to be imaged by utilizing the navigation echo sequence;
obtaining a pre-adjusting motion indication characteristic quantity standard deviation and a pre-adjusting motion indication characteristic quantity mean value of each line of the data to be imaged, which are output after the navigation echo sequence carries out pre-adjusting phase identification;
scaling a preset threshold value of the motion indication characteristic quantity corresponding to the preset scanning imaging sequence based on the preset motion indication characteristic quantity standard deviation and the preset motion indication characteristic quantity mean value;
judging whether the standard deviation of the pre-adjusted motion indication characteristic quantity is larger than a preset threshold of the scaled motion indication characteristic quantity;
if so, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, replacing the preset scanning imaging sequence according to a sequence replacement instruction sent by a user or replacing the sequence parameter of the preset scanning imaging sequence according to a parameter replacement instruction sent by the user, and returning to the step of performing pre-adjustment phase identification on each line of the data to be imaged by using the navigation echo sequence;
if not, setting the range obtained by calculating the preset threshold of the preset motion indication characteristic quantity after the preset motion indication characteristic quantity mean value plus or minus is zoomed as the threshold range of the motion indication characteristic quantity.
3. The magnetic resonance imaging artifact removal method as set forth in claim 2, wherein before the pre-conditioning phase identification of each row of the data to be imaged by the navigator echo sequence, the method further comprises:
and determining the preset threshold value of the motion indication characteristic quantity corresponding to different preset scanning imaging sequences.
4. The method of eliminating artifacts in magnetic resonance imaging according to claim 3, wherein determining the preset threshold of the motion indicating characteristic quantity corresponding to different preset scan imaging sequences comprises:
s201: controlling the debugging model to move with a preset motion amplitude;
s202: performing magnetic resonance scanning on the debugging model to generate a plurality of rows of debugging data to be imaged;
s203: imaging processing is carried out on each row of the debugging data to be imaged by utilizing the preset scanning imaging sequence so as to output a magnetic resonance debugging image;
s204: judging whether the quality of the magnetic resonance debugging image is within a preset acceptable range, if so, entering step S205, and if not, entering step S206;
s205: increasing the preset motion amplitude, and returning to the step S201;
s206: and determining a motion indication characteristic quantity preset threshold value corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image.
5. The magnetic resonance imaging artifact removal method as set forth in claim 4, wherein before determining the preset threshold of the motion indicating feature quantity corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image, the method further comprises:
determining characteristic values of each row of the debugging data to be imaged by using the navigation echo sequence;
determining a pre-adjusting motion indication debugging characteristic quantity standard deviation of each row of the to-be-imaged debugging data;
judging whether the standard deviation of the preset motion indication debugging characteristic quantity is within a preset debugging range or not;
if yes, determining a motion indication characteristic quantity preset threshold value corresponding to the preset scanning imaging sequence based on the magnetic resonance debugging image;
and if not, adjusting the sensitivity of the navigation echo sequence, and returning to the step of determining the characteristic value of each row of the to-be-imaged debugging data by using the navigation echo sequence.
6. The magnetic resonance imaging artifact removal method as set forth in claim 5, wherein adjusting the sensitivity of the navigator echo sequence comprises:
adjusting a working interval of the navigator echo sequence to adjust a sensitivity of the navigator echo sequence.
7. A magnetic resonance imaging artifact removal system, comprising:
the phase recognition unit is used for carrying out phase recognition on the data to be imaged by utilizing the navigation echo sequence;
the first scanning unit is used for carrying out magnetic resonance scanning on the patient again to update the data to be imaged if the patient is in a motion state when the signal output by the navigation echo sequence is used for judging that the patient is subjected to the magnetic resonance scanning to generate the data to be imaged, and carrying out phase identification on the updated data to be imaged by utilizing the navigation echo sequence;
the second scanning unit is used for performing scanning imaging processing on the data to be imaged by using a preset scanning imaging sequence if the patient is not in a motion state when the signal output by the navigation echo sequence is used for judging that the patient is subjected to magnetic resonance scanning so as to generate or update the data to be imaged;
the signal output by the navigation echo sequence comprises a standard deviation of a motion indication characteristic quantity output after phase identification is carried out on each numerical value in the data to be imaged;
the magnetic resonance imaging artifact eliminating system is also used for judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity after the phase identification is carried out on the data to be imaged by utilizing the navigation echo sequence; if not, judging that the patient is in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged, re-performing the magnetic resonance scanning on the patient to update the data to be imaged, performing phase identification on the updated data to be imaged by using the navigation echo sequence, and returning to the step of judging whether the standard deviation of the motion indication characteristic quantity output by the navigation echo sequence is within the threshold range of the motion indication characteristic quantity; if so, determining that the patient is not in a motion state when the patient is subjected to magnetic resonance scanning to generate the data to be imaged;
the calculation formula of the motion indication characteristic quantity is as follows:
wherein the movement indicates the characteristic quantity
To use the signal detected after a specific temporal and spatial distribution of the magnetic field after radio frequency excitation,
for the coil sensitivity and the spatial distribution of the radio frequency field,
in order to be the spin density,
is the volume of the radio frequency field,
in order to be able to determine the relaxation time,
for the purpose of the magnetic induction intensity,
is a gyromagnetic ratio, about 42.58MHz,
in the form of a time, the time,
is a time independent variable and is used as a time independent variable,
is a radius independent variable.
8. An apparatus for magnetic resonance imaging artifact reduction, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the magnetic resonance imaging artifact removal method as claimed in any one of claims 1 to 6 when executing the computer program.
9. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the magnetic resonance imaging artifact cancellation method according to any one of the claims 1 to 6.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6341179B1 (en) * | 1996-07-09 | 2002-01-22 | The Secretary Of State For Defence In Her Brittanic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Method and apparatus for imaging artefact reduction |
| CN102215749A (en) * | 2008-11-18 | 2011-10-12 | 株式会社日立医疗器械 | Magnetic resonance imaging device and magnetic resonance imaging method |
| CN106539584A (en) * | 2015-09-22 | 2017-03-29 | 上海联影医疗科技有限公司 | MR imaging method and system |
| CN106597333A (en) * | 2016-12-30 | 2017-04-26 | 上海联影医疗科技有限公司 | Magnetic resonance parallel imaging method and magnetic resonance imaging system |
| CN109907759A (en) * | 2019-04-01 | 2019-06-21 | 上海联影医疗科技有限公司 | MR imaging method and system |
-
2022
- 2022-06-24 CN CN202210722569.3A patent/CN114795182B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6341179B1 (en) * | 1996-07-09 | 2002-01-22 | The Secretary Of State For Defence In Her Brittanic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Method and apparatus for imaging artefact reduction |
| CN102215749A (en) * | 2008-11-18 | 2011-10-12 | 株式会社日立医疗器械 | Magnetic resonance imaging device and magnetic resonance imaging method |
| CN106539584A (en) * | 2015-09-22 | 2017-03-29 | 上海联影医疗科技有限公司 | MR imaging method and system |
| CN106597333A (en) * | 2016-12-30 | 2017-04-26 | 上海联影医疗科技有限公司 | Magnetic resonance parallel imaging method and magnetic resonance imaging system |
| CN109907759A (en) * | 2019-04-01 | 2019-06-21 | 上海联影医疗科技有限公司 | MR imaging method and system |
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Denomination of invention: A magnetic resonance imaging artifact elimination method and related components Effective date of registration: 20221021 Granted publication date: 20220902 Pledgee: Weifang Bank Co.,Ltd. Weifang High Tech sub branch Pledgor: Shandong Aoxin Medical Technology Co.,Ltd. Registration number: Y2022980019186 |