CN110415213A - Magnetic field homogeneity detection method, device, computer equipment and storage medium - Google Patents
Magnetic field homogeneity detection method, device, computer equipment and storage medium Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
- G06T7/001—Industrial image inspection using an image reference approach
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/136—Segmentation; Edge detection involving thresholding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10088—Magnetic resonance imaging [MRI]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20081—Training; Learning
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
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- G06T2207/20084—Artificial neural networks [ANN]
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Abstract
This application involves a kind of magnetic field homogeneity detection methods, device, computer equipment and storage medium, since whether the magnetic field that computer equipment can detecte out scanning device according to acquisition magnetic field reference picture and preset algorithm is uniform, if it is detected that Magnetic field inhomogeneity, then prompting can be awarded by exporting prompt information, in this method, since computer equipment once detects that the magnetic field of scanning device exists unevenly, it will give and remind at the first time, operator is allowed for so at the first time it can be found that Magnetic field inhomogeneity, it avoids because manual inspection cannot find Magnetic field inhomogeneity in time, it ensure that the quality of follow up scan image, to improve the utilization of resources.
Description
Technical field
This application involves magnetic resonance field of medical technology, more particularly to a kind of magnetic field homogeneity detection method, device, meter
Calculate machine equipment and storage medium.
Background technique
In magnetic resonance, magnetic field's regularity is the necessary condition for guaranteeing good scan image quality.The process of clinical use
In usually occur it is accidental as magnetic field it is uneven caused by image quality decrease, for example, wave spectrum line broadening, EPI anamorphose,
B-SSFP image striped, the failure of pressure rouge, gradient echo image local signal missing and spin echo local signal missing etc..
Caused by usually above-mentioned Magnetic field inhomogeneity is often because of the introducing object with diagnosis and treatment object, for example, et al. Ke
Object, artificial tooth, necklace, hair clip, wrist-watch, metal object on clothing etc., wherein implants in vivo is having the case where Magnetic field inhomogeneity
Under, it needs to decide whether according to the actual situation to rescan, and article additional on body then needs before magnetic resonance examination
Removal, to guarantee the quality of scan image.But in practical applications, often exist because operator forgets or metal object
Position, which compares concealment and is not examined to come out etc., additionally introduces object caused by reasons, and in this case, additionally introducing object will lead to magnetic
It is uneven, and scan image quality is caused to decline, if but operator find scan image there are when quality problems,
It experienced the scanning of multiple and different agreements, then remove metal object and continue to scan on, then can lose the image scanned and Xin Jia association
The referring-to relation of view is unfavorable for result diagnosis, moreover, operator fails to browse scan image in time, when discovery has had more
Problem occurs for group scan image, needs to repeat more scan protocols at this time, expends the more time, cause under patient's circulation
Drop.
Therefore, existing scanning process cannot find Magnetic field inhomogeneity in time, so that the quality of scan image is abnormal,
To result in waste of resources.
Summary of the invention
Based on this, it is necessary to Magnetic field inhomogeneity cannot be found in time for above-mentioned existing scanning process, so that scanning figure
The quality of picture is abnormal, thus the technical issues of resulting in waste of resources, provide a kind of magnetic field homogeneity detection method, device,
Computer equipment and storage medium.
In a first aspect, the embodiment of the present application provides a kind of magnetic field homogeneity detection method, this method comprises:
Obtain the magnetic field reference picture of current scanning device；Wherein, magnetic field reference picture indicates reflection scanning device magnetic
The image of field uniformity；
Using preset algorithm, judge whether the magnetic field of scanning device is uniform according to magnetic field reference picture；
If the Magnetic field inhomogeneity of scanning device, exports prompt information；Wherein, prompt information is for prompting scanning device magnetic
Field is uneven.
In one of the embodiments, above-mentioned magnetic field reference picture include scanning device the field B0 figure and/or position as
Phase image.
Above-mentioned preset algorithm includes thresholding method or deep learning algorithm in one of the embodiments,.
If preset algorithm is thresholding method in one of the embodiments,；It is then above-mentioned to use preset algorithm, according to magnetic
Field reference picture judges whether the magnetic field of scanning device is uniform, comprising:
Judge to roll up whether pleat fringe number belongs to normal range (NR) in the reference picture of magnetic field；
If volume pleat fringe number belongs to normal range (NR), it is determined that the field homogeneity of scanning device；
If volume pleat fringe number is not belonging to normal range (NR), it is determined that the Magnetic field inhomogeneity of scanning device.
It is above-mentioned in one of the embodiments, to judge to roll up whether pleat fringe number belongs to normal range (NR) in the reference picture of magnetic field,
Include:
Judge whether the quantity that pleat striped is rolled up in the reference picture of magnetic field is less than default striped threshold value；
If the quantity for rolling up pleat striped is less than default striped threshold value, it is determined that volume pleat fringe number belongs to normal range (NR)；
If the quantity for rolling up pleat striped is greater than or equal to default striped threshold value, it is determined that volume pleat fringe number is not belonging to normal model
It encloses.
If preset algorithm is deep learning algorithm in one of the embodiments,；It is then above-mentioned to use preset algorithm, according to
Magnetic field reference picture judges whether the magnetic field of scanning device is uniform, comprising:
Magnetic field reference picture is input in preset neural network, judging result is obtained；Wherein, neural network is for sentencing
Whether the magnetic field of disconnected scanning device is uniform, and whether the magnetic field that judging result is used to indicate scanning device is uniform.
This method in one of the embodiments, further include:
Obtain multiple sample magnetic field reference pictures, the corresponding magnetic field homogeneity judging result of each sample magnetic field reference picture；
Using multiple sample magnetic field reference pictures as input, the corresponding magnetic field homogeneity judgement of each sample magnetic field reference picture
As a result as output, the initial neural network of training, obtained neural network.
Above-mentioned prompt information includes at least the mark in Magnetic field inhomogeneity region in one of the embodiments,.
Second aspect, the embodiment of the present application provide a kind of magnetic field homogeneity detection device, which includes:
Image collection module, for obtaining the magnetic field reference picture of current scanning device；Wherein, magnetic field reference picture table
Show the image of reflection scanning device magnetic field homogeneity；
Uniformity detection module judges the magnetic field of scanning device according to magnetic field reference picture for using preset algorithm
Whether uniformly；
Cue module, if the Magnetic field inhomogeneity for scanning device, exports prompt information；Wherein, prompt information is used for
Prompt scanning device Magnetic field inhomogeneity.
The third aspect, the embodiment of the present application provide a kind of computer equipment, including memory and processor, memory storage
There is computer program, processor realizes the step for any one method that above-mentioned first aspect embodiment provides when executing computer program
Suddenly.
Fourth aspect, the embodiment of the present application provide a kind of computer readable storage medium, are stored thereon with computer program,
The step of any one method that above-mentioned first aspect embodiment provides is realized when computer program is executed by processor.
A kind of magnetic field homogeneity detection method, device, computer equipment and storage medium provided by the embodiments of the present application, by
It is whether uniform in the magnetic field that computer equipment can detecte out scanning device according to acquisition magnetic field reference picture and preset algorithm,
Once if it is detected that Magnetic field inhomogeneity, promptings can be awarded by exporting prompt information, in this method, due to computer equipment inspection
The magnetic field for measuring scanning device exists unevenly, will give and remind at the first time, allows for operator so at the first time
It can be found that Magnetic field inhomogeneity, avoids because manual inspection cannot find Magnetic field inhomogeneity in time, ensure that follow up scan image
Quality, to improve the utilization of resources.
Detailed description of the invention
Fig. 1 is a kind of applied environment figure for magnetic field homogeneity detection method that one embodiment provides；
Fig. 2 is a kind of flow diagram for magnetic field homogeneity detection method that one embodiment provides；
Fig. 3 is the schematic diagram that a kind of prompt information that one embodiment provides shows content；
Fig. 4 is a kind of flow diagram for magnetic field homogeneity detection method that one embodiment provides；
Fig. 5 is a kind of flow diagram for magnetic field homogeneity detection method that one embodiment provides；
Fig. 6 is a kind of flow diagram for magnetic field homogeneity detection method that one embodiment provides；
Fig. 7 is a kind of flow diagram for magnetic field homogeneity detection method that one embodiment provides；
Fig. 8 is a kind of schematic diagram for magnetic resonance imaging system that one embodiment provides；
Fig. 9 is a kind of structural block diagram for magnetic field homogeneity detection device that one embodiment provides；
Figure 10 is a kind of structural block diagram for magnetic field homogeneity detection device that one embodiment provides；
Figure 11 is a kind of structural block diagram for magnetic field homogeneity detection device that one embodiment provides.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
A kind of magnetic field homogeneity detection method provided by the present application is suitable for before MRI scan, can apply
In application environment as shown in Figure 1, which can be server, and internal structure chart can be as shown in Figure 1.It should
Computer equipment includes processor, memory, network interface and the database connected by system bus.Wherein, the computer
The processor of equipment is for providing calculating and control ability.The memory of the computer equipment include non-volatile memory medium,
Built-in storage.The non-volatile memory medium is stored with operating system, computer program and database.The built-in storage is non-easy
The operation of operating system and computer program in the property lost storage medium provides environment.The database of the computer equipment is for depositing
Store up the data of magnetic field homogeneity detection method.The network interface of the computer equipment is used to pass through network connection with external terminal
Communication.To realize a kind of magnetic field homogeneity detection method when the computer program is executed by processor.
Under normal circumstances, in magnetic resonance imaging, the field B0 that is rebuild in calibration process figure, or using Scan orientation as
It is all relatively uniform that initial data, which obtains phase image,.But the magnetic field for having some factors that can influence magnetic resonance system, one
The Magnetic field inhomogeneity of denier magnetic resonance scanning system will lead to the scan image quality finally obtained decline, in general, in order to guarantee
Obtained scan image quality is good, in the prior art can there are several types of modes to be prevented: one, medical worker can be with inquiry
It checks and avoids with the mode of inspection；Diagnosis and treatment object substitutes into the article that can influence magnetic field homogeneity, and which is staff
Routine workflow, but be no lack of there are the forgetting of staff, with the reasons such as the confusing communication of patient, metal concealment, no
It is avoided that the introducing of metal object, causes Magnetic field inhomogeneity, so that image quality decrease.Two, patient enters preceding complete between inspection
Portion replaces clothing, a possibility that introducing is excluded, although this method may greatly eliminate the metal object on clothing, but still cannot
It excludes ornaments class and introduces object, and in practical applications, be related to hospital management, popularity rate is lower.Three, the door between magnetic resonance magnet
Mouth installation metal detector is detected, and this mode is also given scanning without the case where influence and warned due to too sensitive,
And have certain investment, in practical applications, popularity rate is relatively low.As it can be seen that in the prior art, precautionary measures and subsequent monitoring are arranged
Shi Jun is manual operation, causes to find that there are uneven situations in magnetic field at the first time, and therefore, embodiments herein provides
A kind of magnetic field homogeneity detection method, device, computer equipment and storage medium, it is intended to solve existing scanning process cannot and
Shi Faxian Magnetic field inhomogeneity, so that the quality of scan image is abnormal, thus the technical issues of resulting in waste of resources.Below will
Specifically how the technical solution of the technical solution of the application and the application is solved by embodiment and in conjunction with attached drawing above-mentioned
Technical problem is described in detail.These specific embodiments can be combined with each other below, for the same or similar concept
Or process may repeat no more in certain embodiments.It should be noted that a kind of magnetic field homogeneity detection provided by the invention
Method, the executing subject of Fig. 2-Fig. 7 are computer equipment, wherein its executing subject can also be magnetic field homogeneity detection device,
Wherein the device can be implemented as by way of software, hardware or software and hardware combining magnetic field homogeneity detection part or
Person is whole.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.
In one embodiment, Fig. 2 provides a kind of magnetic field homogeneity detection method, and what is involved is computers for the present embodiment
Equipment is according to the image that can reflect scanning device magnetic field homogeneity, in the Magnetic field inhomogeneity for detecting scanning device, output
The detailed process of prompt information, as shown in Figure 2, which comprises
S101 obtains the magnetic field reference picture of current scanning device；Wherein, magnetic field reference picture indicates that reflection scanning is set
The image of standby magnetic field homogeneity.
In the present embodiment, what magnetic field reference picture indicated is the image that can reflect scanning device magnetic field homogeneity, optional
Ground, magnetic field reference picture include the field the B0 figure of scanning device and/or the phase image of positioning picture.Illustratively, in practical applications,
If the magnetic field reference picture includes the field the B0 figure of scanning device, computer equipment in a calibration process, is obtained by rebuilding
The B0 figure；If the magnetic field reference picture includes the phase image for positioning picture, computer equipment passes through to the original of positioning picture
Data obtain the phase image of positioning picture.
S102 judges whether the magnetic field of scanning device is uniform according to magnetic field reference picture using preset algorithm.
In this step, based on the magnetic field reference picture obtained in above-mentioned S101 step, computer equipment uses preset calculation
Method judges whether the magnetic field of scanning device is uniform according to magnetic field reference picture, wherein the preset algorithm can to pre-set
To determine the whether uniform algorithm logic in magnetic field according to magnetic field reference picture, specifically algorithm pattern, the present embodiment are not limited
It is fixed.It should be noted that, if the magnetic field of magnetic resonance scanning system is affected, causing unevenly to divide in magnetic resonance scan sequences
Cloth can be then reflected in the reference picture of magnetic field, for example, can make generation volume pleat in the phase image of B0 figures or positioning picture, specifically
It refers to shown in the volume pleat in Fig. 3, moreover, if Distribution of Magnetic Field is affected more violent, the phase diagram of B0 figures or positioning picture
In volume pleat fringe number at most (volume pleat more severe)；Or calculate the maximum for scrolling up pleat striped in reference picture along certain party
Length determines the degree that Distribution of Magnetic Field is affected according to the maximum length of the volume pleat striped；Or calculate edge in reference picture
The minimum length without volume pleat striped on specific direction, determine what Distribution of Magnetic Field was affected according to the minimum length without volume pleat striped
Degree.Therefore, computer equipment can be schemed or be positioned the features such as the volume pleat striped number in the phase image of picture by B0, be sentenced
Whether the magnetic field of disconnected magnetic resonance system produces variation.
S103, if the Magnetic field inhomogeneity of scanning device, exports prompt information；Wherein, prompt information is for prompting scanning
Equipment Magnetic field inhomogeneity.
If detecting the Magnetic field inhomogeneity of scanning device based on computer equipment in above-mentioned S102 step, prompt letter is exported
Breath, wherein the prompt information is for prompting scanning device Magnetic field inhomogeneity.Wherein, which exports the prompt information
Mode can there are many, for example, can be placed in operation interface using pop-up box and prompted, sound can also be given simultaneously and mentioned
Show, the present embodiment is not specifically limited the mode of this computer equipment output prompt information.Optionally, the prompt information is at least
Mark including Magnetic field inhomogeneity region.Wherein the mark in the Magnetic field inhomogeneity region can be number, letter or number with
The combination of letter, it is, of course, also possible to directly use the text importing Magnetic field inhomogeneity region, the present embodiment is not done this specifically yet
It limits.Illustratively, as shown in figure 3, by taking prompt information is pop-up prompting frame as an example, phase diagram can be added in the prompting frame for behaviour
Make personnel's understanding, can not also add, which can be stored in local data base, can also not save, can also have
It is saved when prompt, not save when no prompt etc., the present embodiment is particularly shown shape for prompt information
Formula and display content are not construed as limiting.
Magnetic field homogeneity detection method provided in this embodiment, due to computer equipment according to obtain magnetic field reference picture and
Whether the magnetic field that preset algorithm can detecte out scanning device is uniform, if it is detected that Magnetic field inhomogeneity, can be mentioned by output
Show that information awards prompting, in this method, due to computer equipment once detect scanning device magnetic field exist it is uneven, will
It gives and reminds at the first time, allow for operator so at the first time it can be found that Magnetic field inhomogeneity, avoids because of artificial inspection
Magnetic field inhomogeneity cannot be found in time by looking into, and ensure that the quality of follow up scan image, to improve the utilization of resources.
Wherein, the preset algorithm mentioned in above-described embodiment includes thresholding method or deep learning algorithm.It is right
Use thresholding method or deep learning algorithm to the specific mistake of the detection of scanning device magnetic field homogeneity in computer equipment
Journey, the application can be illustrated with the following examples.
If preset algorithm is thresholding method, on the basis of above embodiments, the embodiment of the present application provides one
Kind magnetic field homogeneity detection method, what is involved is computer equipments to determine magnetic according to the volume pleat fringe number on the reference picture of magnetic field
The whether normal detailed process of field uniformity, as shown in figure 4, above-mentioned S102 step includes:
S201 judges to roll up whether pleat fringe number belongs to normal range (NR) in the reference picture of magnetic field, if volume pleat fringe number belongs to just
Normal range, thens follow the steps S202, if volume pleat fringe number is not belonging to normal range (NR), thens follow the steps S203.
S202 determines the field homogeneity of scanning device.
S203 determines the Magnetic field inhomogeneity of scanning device.
In the present embodiment, computer equipment judges to roll up whether pleat fringe number belongs to normal range (NR) in the reference picture of magnetic field, if
Judging result is that volume pleat fringe number belongs to normal range (NR), then computer equipment executes S202 step, that is, determines the magnetic of scanning device
Field is uniformly；If judging result is that volume pleat fringe number is not belonging to normal range (NR), computer equipment executes S203 step, i.e. determination is swept
Retouch the Magnetic field inhomogeneity of equipment.
Wherein, as shown in figure 5, optionally, computer equipment judges to roll up whether pleat fringe number belongs in the reference picture of magnetic field
A kind of achievable mode of normal range (NR) includes:
S301, judges whether the quantity that pleat striped is rolled up in the reference picture of magnetic field is less than default striped threshold value；If rolling up pleat striped
Quantity be less than default striped threshold value, then follow the steps S302；If the quantity for rolling up pleat striped is greater than or equal to default striped threshold value,
Then follow the steps S303.
S302 determines that volume pleat fringe number belongs to normal range (NR).
S303 determines that volume pleat fringe number is not belonging to normal range (NR).
In present embodiment, computer equipment judges whether the quantity that pleat striped is rolled up in the reference picture of magnetic field is less than default item
Line threshold value, it is to be understood that can unevenly cause to generate volume pleat, volume pleat striped on the reference picture of magnetic field due to magnetic field
Number is fewer, and expression Distribution of Magnetic Field is more uniform, then in this step, if the quantity of computer equipment judging result volume pleat striped is small
In default striped threshold value, S302 is thened follow the steps, that is, determines that volume pleat fringe number belongs to normal range (NR)；If rolling up the quantity of pleat striped
More than or equal to default striped threshold value, S303 is thened follow the steps, that is, determines that volume pleat fringe number is not belonging to normal range (NR).
Magnetic field homogeneity detection method provided in this embodiment, computer equipment detect scanning device using thresholding method
Magnetic field it is whether uniform, if being specifically less than default striped threshold value determining the volume pleat fringe number in the reference picture of magnetic field,
Field homogeneity is determined, if the volume pleat fringe number in the reference picture of magnetic field is more than or equal to default striped threshold value, it is determined that magnetic field
Unevenly, in this way magnetic field send out at it is uneven when, can at the first time be detected by computer equipment, ensure that magnetic field is equal significantly
The timeliness and accuracy of even property detection.
If preset algorithm is thresholding method, equally based on the above embodiment, the embodiment of the present application provides a kind of magnetic
Field uniformity detection method, what is involved is computer equipments to judge whether magnetic field is uniform by preset neural network for the embodiment
Detailed process judged wherein above-mentioned S102 step includes: that magnetic field reference picture is input in preset neural network
As a result；Wherein, neural network is for judging whether the magnetic field of scanning device is uniform, and judging result is used to indicate the magnetic of scanning device
Whether field is uniform.
In the present embodiment, the magnetic field reference picture that computer equipment will obtain in S101 step, by the magnetic field reference picture
It is input in preset neural network, wherein the neural network is trained in advance for exporting magnetic field homogeneity judging result
Network, the result of neural network output in this way is the judging result of magnetic field homogeneity, and the judging result is used to indicate
Whether the magnetic field of scanning device is uniform, i.e., the judging result includes that scanning device field homogeneity or scanning device magnetic field are uneven
It is even.
Magnetic field homogeneity detection method provided in this embodiment, by magnetic field reference picture by preset neural network, directly
Obtain the judging result of magnetic field homogeneity, in this way magnetic field send out at it is uneven when, computer equipment can at the first time be calculated
Machine equipment detects, ensure that the timeliness and accuracy of magnetic field homogeneity detection significantly.
In addition, what is involved is computer equipments the embodiment of the present application also provides a kind of magnetic field homogeneity detection method
The detailed process of training neural network, as shown in fig. 6, then this method further include:
S401 obtains the corresponding magnetic field homogeneity judgement of multiple sample magnetic field reference pictures, each sample magnetic field reference picture
As a result.
This step is the process that computer equipment obtains training sample, and in practical applications, computer equipment obtains multiple
Sample magnetic field reference picture, the corresponding magnetic field homogeneity judging result of each sample magnetic field reference picture, wherein computer equipment can
First to get multiple sample magnetic field reference pictures, each corresponding magnetic field homogeneity of sample magnetic field reference picture is then obtained
Judging result, using a magnetic field homogeneity judging result as the corresponding magnetic field homogeneity judging result of sample magnetic field reference picture.
S402, using multiple sample magnetic field reference pictures as input, the corresponding field homogeneity of each sample magnetic field reference picture
Property judging result as output, the initial neural network of training, obtained neural network.
Based on the training sample obtained in above-mentioned S401 step, computer equipment using each sample reference picture as input,
The corresponding magnetic field homogeneity judging result of each sample magnetic field reference picture repeatedly trains initial neural network as output, until
The initial neural network can be exported according to any one sample magnetic field reference picture, obtained corresponding sample magnetic field uniformity and sentenced
Break as a result, above-mentioned neural network can be obtained.In this way, ensure that subsequent use neural network sentences magnetic field homogeneity significantly
Disconnected accuracy.
Based on above-mentioned all embodiments, present invention also provides the embodiments of complete method, as shown in fig. 7, the embodiment
Include: S1: computer equipment obtains magnetic field reference picture；Such as obtain the phase diagram of B0 figures or positioning picture；
S2: whether computer equipment is abnormal according to magnetic field reference picture detection magnetic field homogeneity；If detecting, magnetic field is equal
Even sexual abnormality thens follow the steps S3；It is no to then follow the steps S6；
S3: checking and stop, and prompts Magnetic field inhomogeneity, and operator is prompted to check；
S4: the instruction that operator rescans whether is received；Instruction is rescaned if receiving, returns to S1 step
Suddenly, restart；Otherwise, S5 is executed；
S5: the instruction that operator continues to scan on whether is received；Instruction is continued to scan on if receiving, executes S6 step
Suddenly；Otherwise, process terminates.
S6: continue next scanning step；
S7: terminate.
It should be understood that although each step in the flow chart of Fig. 2-7 is successively shown according to the instruction of arrow,
These steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these steps
Execution there is no stringent sequences to limit, these steps can execute in other order.Moreover, at least one in Fig. 2-7
Part steps may include that perhaps these sub-steps of multiple stages or stage are not necessarily in synchronization to multiple sub-steps
Completion is executed, but can be executed at different times, the execution sequence in these sub-steps or stage is also not necessarily successively
It carries out, but can be at least part of the sub-step or stage of other steps or other steps in turn or alternately
It executes.
In addition, detection method specific for magnetic field homogeneity provided by the embodiments of the present application, is applied to magnetic resonance imaging
System is specifically described magnetic resonance imaging system below by several embodiments.
Then as shown in figure 8, the embodiment of the present application provides a kind of schematic diagram of magnetic resonance imaging system 100.The magnetic resonance at
As system 100 may include MRI scanner 110, control module 120, processing module 130 and display module 140.MRI scanner
110 may include magnetic body module 111 and RF module 112.Magnetic body module 111 may include a main magnetic field generator and/or one
A gradient magnetic generator.Main magnetic field generator may include the main magnet that B0 are generated during MRI.Main magnet can adopt
With permanent magnet, superconducting electromagnet, resistance electromagnet etc..Gradient magnetic generator can generate magnetic field on X, Y and/or Z-direction
Gradient.Wherein, X-direction, which can also be referred to as, reads the direction (RO), and Y-direction can also be referred to as the direction phase code (PE), the side Z
To the direction level selection (SS) can also be referred to as.In this application, readout direction and frequency coding direction may be used interchangeably.
Gradient magnetic can encode the spatial information of some target subject (subject) in MRI scanner 110.RF module 112
It may include RF transmitting coil and/or receiving coil, in which: RF transmitting coil can emit RF signal (or for RF pulse-to-pulse
Punching), to excite subject's area-of-interest, generate echo-signal (spin echo)；RF receiving coil can receive region of interest
The echo-signal of domain transmitting.In some embodiments, RF signal can be 30 ° of pulse signals, 40 ° of pulse signals, 60 ° of pulse letters
Number etc..In some embodiments, the function of magnetic body module 111 and/or RF module 112, size, type, geometry, position,
Quantity can determine or change according to one or more specified conditions.For example, RF coil can according to the difference of function and size
To be divided into body coil and local coil.In some embodiments of the present application, body coil can be set to birdcage coil, laterally electricity
Magnetic coil, saddle coil, conspicuous nurse hertz coil etc..In some embodiments of the present application, local coil may include phased array
Alignment circle, annulus etc..
Control module 120 can control magnetic body module 111 and/or RF module 112, processing module in MRI scanner 110
130 and/or display module 140.Control module 120 can be from MRI scanner 110, processing module 130 and/or display module 140
Place receives information.Control module 120 can send information to MRI scanner 110, processing module 130 and/or display module 140.
According to some embodiments of the present application, control module 120 can receive order from display module 140, and the order can be by
User provides, and adjusts magnetic body module 111 and/or the corresponding sweep parameter of RF module 112 to interested according to the order
Region carries out prescan and image scanning.Processing module 130 can handle the different types of letter received from disparate modules
Breath.
In some embodiments, prescan or calibration scan can be first carried out, processing module 130 can handle from RF mould
The pre-scan signal received at block 112, based on pre-scan signal generate pre-scan images, the image can be positioning as or
Calibrate image.Processing module 130 can detect the uniformity of pre-scan images, when determine the pre-scan images uniformity meet expection,
Standby signal is then sent to display module 140, prompts doctor that can execute image scanning；When determine the pre-scan images uniformity not
Meet expection, then sends standby signal to display module 140, prompt doctor's debugging or prompt the magnetic field homogeneity that has an impact
External factor exist.For example, there are metals in interested region.
In some embodiments, processing module 130 can be inputted by the processing of display module 140 by user or operator
Data convert the data to specific command, and the order are supplied to control module 120.Display module 140 can connect
Receive input and/or display output information.The input and/or output information may include program, software, algorithm, data, text
One or more of combinations of sheet, number, image, voice etc..For example, user or operator can be one or more by input
Initial parameter or condition starting scanning.In this application, except exceptional situation is non-clearly prompted, user and operator, which can be interchanged, to be made
With.In another example information can be imported from external source, the external source includes, for example, one kind of floppy disk, hard disk, wireless terminal etc.
Or several combination.In some embodiments, control module 120, processing module 130 and/or display module 140 can integrate in
MRI console.Parameter can be arranged in operator during MRI scan, control image forming program, check and controlled by the MRI
The image that platform generates.
Based on above-mentioned magnetic resonance imaging system shown in Fig. 8, the application also proposed a kind of magnetic resonance scanning method, the party
Method is executed by magnetic resonance system as shown above, and whole process includes:
S10, control module 120 controls MRI scanner 110 and executes prescan to test object, to obtain pre-scan signal,
The quality of the pre-scan signal is related to B0.Optionally, pre-scan signal can be to be excited using calibrating sequence and generate, or
It is that positioning sequence excitation generates.
S11, processing module 130 receive pre-scan signal, and judge B0 uniformities.In view of B0 uniformities by
The influence of magnet system performance, the position of test object and test object with the presence or absence of many factors such as metals.Optionally, locate
Module 130 is managed according to the phase information of pre-scan signal, to obtain phase diagram, which can be B0 figures.
In one embodiment, processing module 130 may include a trained neural network, the trained mind
It is specific network through network, can only characterizes the phase volume pleat in B0 figures and the mapping relations between metal.In a reality
It applies in example, mapping relations are the phase volume pleat degree in B0 figures and the corresponding relationship between metal species.Under normal conditions, non-
The magnetic susceptibilities such as precious metal alloys such as cobalt, chromium, nickel are larger, and the phase volume pleat in B0 figures is more severe, and the artifact of generation is bigger；
The artifact that the noble metals such as gold, silver, palladium generate is smaller；And the materials such as full porcelain, resin hardly generate artifact, will not influence surrounding
The diagnosis of lesion.For example, the type of metal can be copper, aluminium, iron, cobalt, chromium, nickel, gold, silver, palladium etc..In one embodiment,
Mapping relations are related to the size of metal for the phase volume pleat degree in B0 figures, such as: metal volume is bigger, in B0 figures
Phase volume pleat is more obvious；Metal volume is smaller, and the phase volume pleat in B0 figures is fewer.In one embodiment, in B0 figures
Phase is rolled up pleat degree and can be characterized with the phase distortion degree of magnetic resonance signal.
Again, control module 120 is according to the judgement of processing module 130 as a result, the control output prompt letter of display module 140
Breath.
In one embodiment, the judgement result of processing module 130 for B0 within an acceptable range, control display module
140 output prompt informations are that can carry out image scanning.Control module 120 further can control MRI scanner 110 to execute imaging
Sequence.
In one embodiment, the judgement result of processing module 130 for B0 not within an acceptable range, control display mould
Block 140 exports prompt information can include: the information such as type, size of metal of metal.Doctor can exclude test object carrying
Metal, continue aforesaid operations, until processing module 130 judgement result for B0 within an acceptable range.
Following FIG. 9-Figure 11 is the corresponding Installation practice of above-mentioned magnetic field homogeneity detection method embodiment.
In one embodiment, as shown in figure 9, providing a kind of magnetic field homogeneity detection device, which includes: image
Obtain module 15, uniformity detection module 16 and cue module 17, wherein
Image collection module 15, for obtaining the magnetic field reference picture of current scanning device；Wherein, magnetic field reference picture
Indicate the image of reflection scanning device magnetic field homogeneity；
Uniformity detection module 16 judges the magnetic of scanning device according to magnetic field reference picture for using preset algorithm
Whether field is uniform；
Cue module 17, if the Magnetic field inhomogeneity for scanning device, exports prompt information；Wherein, prompt information is used
In prompt scanning device Magnetic field inhomogeneity.
A kind of magnetic field homogeneity detection device provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
In one embodiment, above-mentioned magnetic field reference picture includes the field the B0 figure of scanning device and/or the phase of positioning picture
Image.
In one embodiment, above-mentioned preset algorithm includes thresholding method or deep learning algorithm.
In one embodiment, as shown in Figure 10, a kind of magnetic field homogeneity detection device, above-mentioned uniformity detection are provided
Module 16 includes: judging unit 161, the first determination unit 162 and the second determination unit 163, wherein
Judging unit 161 rolls up whether pleat fringe number belongs to normal range (NR) in the reference picture of magnetic field for judging；
First determination unit 162, if belonging to normal range (NR) for rolling up pleat fringe number, it is determined that the magnetic field of scanning device is equal
It is even；
Second determination unit 163, if being not belonging to normal range (NR) for rolling up pleat fringe number, it is determined that the magnetic field of scanning device is not
Uniformly.
A kind of magnetic field homogeneity detection device provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
In one embodiment, above-mentioned judging unit 161 is specifically used for judging rolling up the number of pleat striped in the reference picture of magnetic field
Whether amount is less than default striped threshold value；If the quantity for rolling up pleat striped is less than default striped threshold value, it is determined that volume pleat fringe number belongs to
Normal range (NR)；If the quantity for rolling up pleat striped is greater than or equal to default striped threshold value, it is determined that volume pleat fringe number is not belonging to normal model
It encloses.
A kind of magnetic field homogeneity detection device provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
In one embodiment, above-mentioned uniformity detection module 17 is specifically used for for magnetic field reference picture being input to preset
In neural network, judging result is obtained；Wherein, neural network is for judging whether the magnetic field of scanning device is uniform, judging result
Whether the magnetic field for being used to indicate scanning device is uniform.
A kind of magnetic field homogeneity detection device provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
In one embodiment, as shown in figure 11, a kind of magnetic field homogeneity detection device is provided, which includes: sample
This image collection module 18 and network training module 19, wherein
Sample image obtains module 18, for obtaining multiple sample magnetic field reference pictures, each sample magnetic field reference picture pair
The magnetic field homogeneity judging result answered；
Network training module 19, for using multiple sample magnetic field reference pictures as input, each sample magnetic field reference picture
Corresponding magnetic field homogeneity judging result is as output, the initial neural network of training, obtained neural network.
A kind of magnetic field homogeneity detection device provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
In one embodiment, above-mentioned prompt information includes at least the mark in Magnetic field inhomogeneity region.
A kind of magnetic field homogeneity detection device provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
Specific restriction about magnetic field homogeneity detection device may refer to above for magnetic field homogeneity detection method
Restriction, details are not described herein.Modules in above-mentioned magnetic field homogeneity detection device can be fully or partially through software, hard
Part and combinations thereof is realized.Above-mentioned each module can be embedded in the form of hardware or independently of in the processor in computer equipment,
It can also be stored in a software form in the memory in computer equipment, execute the above modules in order to which processor calls
Corresponding operation.
In one embodiment, a kind of computer equipment is provided, which can be terminal, internal structure
Figure can be as shown in Figure 1 above.The computer equipment include by system bus connect processor, memory, network interface,
Display screen and input unit.Wherein, the processor of the computer equipment is for providing calculating and control ability.The computer equipment
Memory include non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with operating system and calculating
Machine program.The built-in storage provides environment for the operation of operating system and computer program in non-volatile memory medium.It should
The network interface of computer equipment is used to communicate with external terminal by network connection.The computer program is executed by processor
When to realize a kind of magnetic field homogeneity detection method.The display screen of the computer equipment can be liquid crystal display or electronic ink
Water display screen, the input unit of the computer equipment can be the touch layer covered on display screen, be also possible to computer equipment
Key, trace ball or the Trackpad being arranged on shell can also be external keyboard, Trackpad or mouse etc..
It will be understood by those skilled in the art that structure shown in above-mentioned Fig. 1, only portion relevant to application scheme
The block diagram of separation structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer
Equipment may include perhaps combining certain components or with different component cloth than more or fewer components as shown in the figure
It sets.
In one embodiment, a kind of computer equipment, including memory and processor are provided, is stored in memory
Computer program, the processor perform the steps of when executing computer program
Obtain the magnetic field reference picture of current scanning device；Wherein, magnetic field reference picture indicates reflection scanning device magnetic
The image of field uniformity；
Using preset algorithm, judge whether the magnetic field of scanning device is uniform according to magnetic field reference picture；
If the Magnetic field inhomogeneity of scanning device, exports prompt information；Wherein, prompt information is for prompting scanning device magnetic
Field is uneven.
A kind of computer equipment provided by the above embodiment, implementing principle and technical effect and above method embodiment class
Seemingly, details are not described herein.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program performs the steps of when being executed by processor
Obtain the magnetic field reference picture of current scanning device；Wherein, magnetic field reference picture indicates reflection scanning device magnetic
The image of field uniformity；
Using preset algorithm, judge whether the magnetic field of scanning device is uniform according to magnetic field reference picture；
If the Magnetic field inhomogeneity of scanning device, exports prompt information；Wherein, prompt information is for prompting scanning device magnetic
Field is uneven.
A kind of computer readable storage medium provided by the above embodiment, implementing principle and technical effect and the above method
Embodiment is similar, and details are not described herein.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
To any reference of memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of magnetic field homogeneity detection method, which is characterized in that the described method includes:
Obtain the magnetic field reference picture of current scanning device；The magnetic field reference picture indicates to reflect the scanning device magnetic field
The image of uniformity；
Using preset algorithm, judge whether the magnetic field of the scanning device is uniform according to the magnetic field reference picture；
If the Magnetic field inhomogeneity of the scanning device, exports prompt information；The prompt information is for prompting the scanning to set
Standby Magnetic field inhomogeneity.
2. the method according to claim 1, wherein the magnetic field reference picture includes the B0 of the scanning device
The phase image of field figure and/or positioning picture.
3. method according to claim 1 or 2, which is characterized in that the preset algorithm include thresholding method or
Deep learning algorithm.
4. according to the method described in claim 3, it is characterized in that, the preset algorithm is thresholding method；
It is then described to use preset algorithm, judge whether the magnetic field of the scanning device is uniform according to the magnetic field reference picture,
Include:
Judge to roll up whether pleat fringe number belongs to normal range (NR) in the magnetic field reference picture；
If the volume pleat fringe number belongs to normal range (NR), it is determined that the field homogeneity of the scanning device；
If the volume pleat fringe number is not belonging to normal range (NR), it is determined that the Magnetic field inhomogeneity of the scanning device.
5. according to the method described in claim 4, it is characterized in that, rolling up pleat fringe number in the judgement magnetic field reference picture
Whether normal range (NR) is belonged to, comprising:
Judge whether the quantity that pleat striped is rolled up in the magnetic field reference picture is less than default striped threshold value；
If the quantity of the volume pleat striped is less than default striped threshold value, it is determined that the volume pleat fringe number belongs to normal range (NR)；
If the quantity of the volume pleat striped is greater than or equal to the default striped threshold value, it is determined that the volume pleat fringe number is not belonging to
Normal range (NR).
6. according to the method described in claim 3, it is characterized in that, the preset algorithm is deep learning algorithm；
It is then described to use preset algorithm, judge whether the magnetic field of the scanning device is uniform according to the magnetic field reference picture,
Include:
The magnetic field reference picture is input in preset neural network, judging result is obtained；The neural network is for sentencing
Whether the magnetic field for the scanning device of breaking is uniform, and whether the magnetic field that the judging result is used to indicate the scanning device is uniform.
7. the method according to claim 1, wherein the method also includes:
Obtain multiple sample magnetic field reference pictures, the corresponding magnetic field homogeneity judging result of each sample magnetic field reference picture；
Using multiple sample magnetic field reference pictures as input, the corresponding magnetic field homogeneity judgement of each sample magnetic field reference picture
As a result as output, the initial neural network of training, the obtained neural network.
8. the method according to claim 1, wherein the prompt information includes at least Magnetic field inhomogeneity region
Mark.
9. a kind of computer equipment, including memory and processor, the memory are stored with computer program, feature exists
In the step of processor realizes any one of claims 1 to 8 the method when executing the computer program.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
The step of method described in any item of the claim 1 to 8 is realized when being executed by processor.
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