CN103845054B - The method and device of magnetic resonance imaging lamella deformation warning - Google Patents
The method and device of magnetic resonance imaging lamella deformation warning Download PDFInfo
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- CN103845054B CN103845054B CN201210501900.5A CN201210501900A CN103845054B CN 103845054 B CN103845054 B CN 103845054B CN 201210501900 A CN201210501900 A CN 201210501900A CN 103845054 B CN103845054 B CN 103845054B
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Abstract
The invention discloses a kind of method of lamella deformation warning, it includes：Step 1, in system calibration, the field figure of gradient fields is obtained, the approximately linear area of gradient fields is gone out according to the gradient fields threshold calculations of the field figure of gradient fields and setting；Step 2, Scan orientation picture and load for follow up scan lamella group position reference, open follow up scan agreement, calculate gradient fields approximately linear area with positioning picture intersection and mark；Step 3, lamella orientation and lamella visual field size are determined according to the setup parameter of the scan protocols, whether the lamella calculated according to the information and gradient fields approximately linear area in the lamella group is located within deformation tolerance interval, and the lamella not fallen within tolerance interval is put to the mark code of " may deform " in scan protocols；Step 4, judge whether the direction, position and visual field size of the lamella group change, when changing, repeat step 3.The invention also discloses a kind of device of lamella deformation warning, simplifies the operation of user while obtains higher accuracy and security.
Description
【Technical field】
The present invention is that the method and device of warning is deformed about a kind of magnetic resonance imaging lamella, more particularly to one kind is scanning
The lamella in the lamella group is warned to there may be the method and dress of the warning of deformation when preparatory stage positions to lamella group
Put.
【Technical background】
Magnetic resonance imaging (Magnetic Resonance Imaging, abbreviation MRI) be one kind in magnetostatic field to being examined
Person applies gradient magnetic and radio frequency (Radio Frequency, abbreviation RF) ripple, and is returned according to what is sent from tested region proton
The technology of the magnetic resonance signal generation image of ripple.
Nonlinear characteristic in magnetic resonance imaging mainly due to gradient fields causes the anamorphose obtained.Gradient fields generally exist
In one specific scope, such as approximately linear in the specific ellipsoid region of system, the image of the imaging in the region become
Shape is smaller, and naked eyes are typically difficult to perceive.But in the big visual field (Field of View, abbreviation FOV) imaging due to imaging area
The edge in domain is frequently located in outside gradient fields linear region, and the anamorphose of acquisition is more serious.Magnetic resonance manufacturer one
As straightening carried out to reduce the deformation of image to the data collected according to the field figure of the gradient field nonlinearity of acquisition, but
Because straightening algorithm needs to give operator's phase there is also the possibility that may correct the positional fault of edge pixel
It should warn.
Therefore, the method and device of warning is deformed it is necessory to provide a kind of improved magnetic resonance imaging lamella, to overcome
The defects of method and device of above-mentioned magnetic resonance imaging lamella deformation warning is present.
【The content of the invention】
It is an object of the invention to provide warned in the lamella group when being positioned to lamella group the scanning preparatory stage
Lamella there may be the method and device of the lamella deformation warning of deformation.
The method of the lamella deformation warning for magnetic resonance imaging of the present invention is to be achieved through the following technical solutions：It is a kind of
The method for warning the lamella in the lamella group to there may be deformation when being positioned to lamella group the scanning preparatory stage, it is wrapped
Include：
Step 1, in system calibration, the field figure of gradient fields is obtained, according to the field figure of the gradient fields and the gradient of setting
Field threshold calculations go out the approximately linear area of gradient fields；
Step 2, Scan orientation picture and load for follow up scan lamella group position reference, open follow up scan agreement,
Calculate the intersection in the gradient fields approximately linear area and the positioning picture and mark；
Step 3, lamella orientation and lamella visual field size are determined according to the parameter of the setting of the scan protocols, according to determination
Whether the lamella that lamella orientation and lamella visual field size and gradient fields approximately linear area are calculated in the lamella group can positioned at deformation
Within the scope of receiving, the lamella not fallen within the tolerance interval is put to the mark code of " may deform " in scan protocols；
Step 4, judge whether the direction, position and visual field size of the lamella group change, when changing, repeat
Step 3.
Further, the step 3 can be realized by the following method：
Size based on the intersection and the lamella visual field, calculate the lamella visual field and fall into gradient fields approximately linear area
The percentage in the lamella visual field shared by region, if the percentage is less than given threshold, being set in scan protocols " may become
The mark code of shape ".
Further, the approximately linear area of the gradient fields is ellipsoid shape.
Further, the given threshold is more than or equal to 80%.
Further, the step 3 can be realized by the following method：
New region is produced with the ratio that lamella visual field scaling is specified, if at least one summit in the new region
Outside the gradient fields approximately linear area, then by the mark code of the piece stratification " may deform " in scan protocols.
Further, the approximately linear area of the gradient fields is ellipsoid shape, the center in the new region with it is described
The center superposition in the lamella visual field.
Further, the ratio specified contracts for two orthogonal sides in the lamella visual field according to identical ratio
Put, each edge scaling is 90%~100%.
Further, in addition to：
Step 5, in scanning imagery, the image acquired in lamella that will do not fallen within tolerance interval adds the lamella
The mark code of " may deform ".
The device of the lamella deformation warning for magnetic resonance imaging system of the present invention is to be achieved through the following technical solutions：
It includes：
Acquisition module, in system calibration, the field figure of gradient fields is obtained, according to the field figure of the gradient fields and the ladder of setting
Degree field threshold calculations go out the approximately linear area of gradient fields；
Module is indicated, Scan orientation picture simultaneously loads the lamella group positioning reference for follow up scan, opens follow up scan association
View, calculate the intersection in the gradient fields approximately linear area and the positioning picture and mark；
Whether computing module, the lamella calculated according to the parameter setting criterion of the scan protocols in the lamella group are located at deformation
Within tolerance interval, the lamella not fallen within the tolerance interval is put to the sign of " may deform " in scan protocols
Code；
Judge module, judges whether the position of the lamella group changes, when changing, into the computing module
Calculate whether lamella deforms；
Display module, if this method is used for scanning imagery, the lamella is added on the image of acquisition " may become
The mark code of shape ".
Further, the approximately linear area of the gradient fields is ellipsoid shape..
Compared with prior art, the present invention is used for the method and device of the lamella deformation warning of magnetic resonance imaging, the warning
Equally it is stored on the result images that scanning obtains, has thus reached following technique effect：First, the operation of user is simplified,
The scanning preparatory stage can warn the possible distortion of operator；2nd, higher accuracy and security are obtained, this method is taken certainly
The method of dynamicization, the difference for judging individual is avoided, the information warning is also saved on the image that scanning obtains.
【Brief description of the drawings】
Fig. 1 is the theory diagram of the construction of magnetic resonance imaging system of the present invention.
Fig. 2 is the schematic device of magnetic resonance imaging lamella deformation warning of the present invention.
Fig. 3 is the flow chart of the method for magnetic resonance imaging lamella deformation warning of the present invention.
Fig. 4 is the first display mode schematic diagram of the method for magnetic resonance imaging lamella deformation warning of the present invention.
Fig. 5 is second of display mode schematic diagram of the method for magnetic resonance imaging lamella deformation warning of the present invention.
【Embodiment】
Refer to shown in Fig. 1, the present invention warns the piece to be a kind of when being positioned to lamella group the scanning preparatory stage
Lamella in layer group there may be the magnetic resonance imaging system 100 of deformation, and it includes main part 110 and console part 130.
Main part 110 includes magnetic resonance imaging system and drive part 120.
Magnetic resonance imaging system includes the main magnet 101 of generation magnetostatic field, the gradient coil positioned at the inner side of main magnet 101
102 and the radio-frequency coil 103 positioned at the inner side of gradient coil 102.
Drive part 120 includes radio-frequency coil drive part 123, gradient coil drive part 122, part of data acquisition
121 and magnetic resonance imaging system control section 124.In order to clearly show the pass that is connected to each other of these parts in Fig. 1
It is and these parts is illustrated as away from main part 110, they is actually positioned at the inside of main part 110.
Magnetic resonance imaging system control section 124 is connected to radio-frequency coil drive part 123, gradient coil drive part
122 and part of data acquisition 121.
The main magnet 101 for generating magnetostatic field can be superconducting magnet.
Radio-frequency coil drive part 123 and part of data acquisition 121 are connected to radio-frequency coil 103.Gradient coil drives
Part 122 is connected to gradient coil 102.
Gradient coil 102 has X-axis gradient coil, Y-axis gradient coil and Z axis gradient coil, for by radio-frequency coil
103 magnetic resonance signals detected assign three dimensional local information.
Radio-frequency coil 103 includes transmitting coil and receiving coil.Transmitting coil and receiving coil can be same coils,
But the coils special separated each other.
Gradient coil drive part 122 launches generation gradient to X-axis gradient coil, Y-axis gradient coil and Z axis gradient coil
The gradient magnetic excitation signal in magnetic field.
Imaging region defines lamella with certain thickness cross section, and some sheet combinations thereofs form lamella group together.
Radio-frequency coil drive part 123 provides rf wave excitation signal to radio-frequency coil 103, so as to be applied to person under inspection 105
Add rf wave, tilt the spin axis of tested region proton and excite proton.
Part of data acquisition 121 obtains the magnetic resonance signal detected by radio-frequency coil 103, and gathers these signals it
As generation magnetic resonance imaging initial data.
The data collected are delivered to data processing section 131 by part of data acquisition 121, also collecting a part
Data deliver to magnetic resonance imaging system control section 124.
Magnetic resonance imaging system control section 124 is by the hardware for calculating and for driving the software of hardware Lai real
It is existing.
Magnetic resonance imaging system control section 124 responds controls radio frequency in the command signal from console part 130
Coil drive part 123, gradient coil drive part 122 and part of data acquisition 121, it is total to so as to be obtained with the magnetic needed
Shake signal.
Console part 130 can be used for the operation of multiple types, including be inputted to magnetic resonance imaging system control section 124
Command parameter and it is entered as initialization directive.
Console part 130 includes magnetic resonance imaging system control section 132, data processing section 131, operation part
134 and display portion 133.
Magnetic resonance imaging system control section 132 is connected to data processing section 131 and display portion 134, at data
Reason part 131 is connected to display portion 133.
In addition, data processing section 131 is connected with part of data acquisition 121, and magnetic resonance imaging system control unit
132 are divided to be connected with magnetic resonance imaging system control section 124.
Operation part 134 is realized that the input equipment is keyboard and mouse by input equipment.
Magnetic resonance imaging system control section 132 is by the hardware for computer and for driving the software of hardware to be subject to
Realize.
Magnetic resonance imaging system control section 132 responds the command signal that operator is inputted by operation part 134, according to
The order of command signal, radio-frequency coil drive part 123, ladder are integrally controlled by magnetic resonance imaging system control section 124
Spend coil drive part 122 and part of data acquisition 121.
Data processing section 131 is by applying predetermined processing procedure, including the magnetic to being sent from part of data acquisition 121
Resonance signal data are calculated and imaging, pass through operation part 134 and magnetic resonance imaging system according to from operator
The order that system control section 132 inputs, to perform the processing procedure for generating MRI.
The request from operator is responded, is shown by the image that data processing section 131 generates in display portion 133.
Display portion 133 is also used for operating the operation diagram picture of magnetic resonance imaging system 100.
Refer to shown in Fig. 2, the magnetic resonance imaging system 100 has the device for being used for lamella deformation warning, and the lamella becomes
The device of shape warning includes：
Acquisition module 21, in system calibration, the field figure of gradient fields is obtained, according to the field figure of the gradient fields and setting
Gradient fields threshold calculations go out the approximately linear area of gradient fields；
Module 22 is indicated, Scan orientation picture simultaneously loads the lamella group positioning reference for follow up scan, opens follow up scan
Agreement, gradient fields approximately linear area is calculated with positioning the intersection of picture and marking；
Computing module 23, lamella orientation and FOV sizes are determined according to the parameter of the setting of the scan protocols, according to the information
And whether the lamella that gradient fields approximately linear area is calculated in the lamella group is located within deformation tolerance interval, by not falling within
State the mark code that the lamella in tolerance interval sets " may deform " in scan protocols；
Judge module 24, judges whether the direction, position and FOV sizes of the lamella group change, when changing,
Into computing module 23；
Display module 25, in scanning imagery, added not falling within the image acquired in the lamella in tolerance interval
The mark code of the lamella " may deform ".In the present invention, display module is the display device 133 in the invention.
Refer to shown in Fig. 3, the step of deforming the method warned for lamella described herein is as follows：
Step S31, in system calibration, the field figure of gradient fields is obtained, according to field figure and the gradient fields threshold calculations of setting
Go out gradient fields approximately linear area.
The field figure of the gradient fields is generally when dispatching from the factory, after magnetic resonance imaging system calibration debugging or in the magnetic resonance
The field figure of the gradient fields obtained after imaging system maintenance and debugging.
The gradient fields approximately linear area, which can simplify, is modeled as relatively regular shape such as ellipsoid shape, can also model
Into less regular shape, such as approximate ellipsoid shape.
The threshold value can be configured as system configuration item.
Step S32, Scan orientation picture simultaneously load the lamella group positioning reference for follow up scan, open follow up scan association
View, calculate the intersection in the gradient fields approximately linear area and the positioning picture and mark.
The scan protocols typically have the related personnel such as technician or doctor to set as the case may be.
Step S33, lamella orientation and visual field size are determined according to the parameter of the setting of the scan protocols, according to the information with
And whether the lamella that gradient fields approximately linear area is calculated in the lamella group is located within deformation tolerance interval, will not fall within described
Lamella in tolerance interval puts the mark code of " may deform " in scan protocols.
The parameter setting criterion has following several ways：" gradient fields approximately linear area is fallen into based on the lamella visual field and accounts for this
The percentage in the lamella visual field is less than the threshold value set " or " based on the lamella visual field with new after the scaling certain proportion of its center
Region do not fall completely within gradient fields approximately linear area ".
In the first way, gradient fields approximately linear area and the intersection of plane where the lamella are first calculated, based on the friendship
Line and the size in the lamella visual field, calculate the lamella visual field and fall into the lamella visual field shared by the region in gradient fields approximately linear area
Percentage, the mark code of " may deform " if the percentage is less than given threshold, is put in the protocol.
Refer to shown in Fig. 4, gradient field wire approximation area 402 and the area of the region lap 403 in the lamella visual field 401
The area in the lamella visual field 401 is accounted for if less than threshold value, then is denoted as " may deform " for the lamella in protocol parameter.In this reality
Apply in example, the threshold value is 80%, and in other embodiments, the threshold value can also be more than 80%.The approximately linear of the gradient fields
Area 402 is ellipsoid shape, what the center in the lamella visual field 401 was intersected with the lamella and the gradient fields approximately linear area 402
The center superposition in region.
In the second way, new region is produced with the ratio that lamella visual field scaling is specified, if the new area
At least one summit in domain is located at outside the gradient fields approximately linear area, then " may become the piece stratification in scan protocols
The mark code of shape ".
Refer to shown in Fig. 5, with the new region 503 obtained after the center scaling certain proportion in the lamella visual field 501, judge
Whether four summits in new region 503 are entirely located in gradient fields approximately linear area 502.If new region 503 has at least
One summit is located at outside gradient fields approximately linear area 502, then puts the mark code of " may deform " in the protocol.In the present embodiment
In, the ratio that sets is two orthogonal sides in the lamella visual field 501 according to identical proportional zoom, the contracting of each edge scaling
Ratio is put as 90%~100%.The approximately linear area 502 of the gradient fields is ellipsoid shape, in the lamella visual field 501
The center superposition in the region that the heart intersects with the lamella and the gradient fields approximately linear area 502, the center in the new region 503 with
The center superposition in the lamella visual field.
Step S34, judges whether the direction, position and visual field size of the lamella group change, when changing, weight
Multiple step S33.
Step S35, in scanning imagery, the image acquired in lamella that will do not fallen within tolerance interval adds the lamella
The mark code of " may deform ".By the sign parameter be stored in scanning obtain result images on the sign should be in image transmitting mistake
It is not lost in journey.
Should " may deformation " mark code can use "！" either other letter characters or figure indicate.
One embodiment of the present invention is the foregoing is only, is not all of or unique embodiment, this area is common
Technical staff is the present invention by reading description of the invention any equivalent change for taking technical solution of the present invention
Claim covered.
Claims (10)
1. a kind of method of lamella deformation warning for magnetic resonance imaging, it includes：
Step 1, in system calibration, the field figure of gradient fields is obtained, according to the field figure of the gradient fields and the gradient fields threshold of setting
Value calculates the approximately linear area of gradient fields；
Step 2, Scan orientation picture and load for follow up scan lamella group position reference, open follow up scan agreement, calculate
Go out the intersection in the gradient fields approximately linear area and the positioning picture and mark；
Step 3, lamella orientation and lamella visual field size are determined according to the parameter of the setting of the scan protocols, according to the lamella of determination
Whether the lamella that orientation and lamella visual field size and gradient fields approximately linear area are calculated in the lamella group is acceptable positioned at deformation
Within the scope of, the lamella not fallen within the tolerance interval is set to the mark code of " may deform " in scan protocols；
Step 4, judge whether the direction, position and visual field size of the lamella group change, when changing, repeat step
3。
2. the method for lamella deformation warning as claimed in claim 1, it is characterised in that：The step 3 can pass through such as lower section
Method is realized：
Size based on the intersection and the lamella visual field, calculate the region that the lamella visual field falls into gradient fields approximately linear area
The percentage in the shared lamella visual field, if the percentage is less than given threshold, set in scan protocols " may deform "
Mark code.
3. the method for lamella deformation warning as claimed in claim 2, it is characterised in that：The approximately linear area of the gradient fields is
Ellipsoid shape.
4. the method for lamella deformation warning as claimed in claim 2, it is characterised in that：The given threshold is more than or equal to
80%.
5. the method for lamella deformation warning as claimed in claim 1, it is characterised in that：The step 3 can pass through such as lower section
Method is realized：
New region is produced with the ratio that lamella visual field scaling is specified, if at least one summit in the new region is located at
Outside the gradient fields approximately linear area, then the lamella is set to the mark code of " may deform " in scan protocols.
6. the method for lamella deformation warning as claimed in claim 5, it is characterised in that：The approximately linear area of the gradient fields is
Ellipsoid shape, the center superposition at the center in the new region and the lamella visual field.
7. the method for lamella deformation warning as claimed in claim 5, it is characterised in that：The ratio specified is the lamella visual field
Two orthogonal sides according to identical proportional zoom, each edge scaling is 90%~100%.
8. the method for lamella deformation warning as claimed in claim 1, it is characterised in that：Also include：
Step 5, in scanning imagery, the image acquired in lamella that will do not fallen within tolerance interval adds lamella " possibility
The mark code of deformation ".
9. a kind of device of lamella deformation warning for magnetic resonance imaging system, it includes：
Acquisition module, in system calibration, the field figure of gradient fields is obtained, according to the field figure of the gradient fields and the gradient fields of setting
Threshold calculations go out the approximately linear area of gradient fields；
Module is indicated, Scan orientation picture simultaneously loads the lamella group positioning reference for follow up scan, opens follow up scan agreement, meter
Calculate the intersection in the gradient fields approximately linear area and the positioning picture and mark；
Computing module, calculate whether lamella in the lamella group can connect positioned at deformation according to the parameter setting criterion of the scan protocols
By within the scope of, the lamella not fallen within the tolerance interval is set to the mark code of " may deform " in scan protocols；
Judge module, judges whether the position of the lamella group changes, and when changing, is calculated into the computing module
Whether lamella deforms；
Display module, in scanning imagery, it will not fall within the image acquired in the lamella in tolerance interval and add the lamella
The mark code of " may deform ".
10. the device of lamella deformation warning as claimed in claim 9, it is characterised in that：The approximately linear area of the gradient fields
For ellipsoid shape.
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| CN101228456A (en) * | 2005-07-25 | 2008-07-23 | 西门子公司 | Method for processing a distortion-corrected 2d or 3d reconstruction image recorded by a magnetic resonance device |
| CN102419426A (en) * | 2010-09-07 | 2012-04-18 | 西门子公司 | Method for imaging a portion of an examination object in a magnetic resonance scanner |
| CN102680927A (en) * | 2011-03-17 | 2012-09-19 | 西门子公司 | Method for determining magnetic resonance data |
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| DE10252852B4 (en) * | 2002-11-13 | 2007-08-02 | Siemens Ag | User interface for the correct planning and positioning of measurement layers on corrected MRI images |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101228456A (en) * | 2005-07-25 | 2008-07-23 | 西门子公司 | Method for processing a distortion-corrected 2d or 3d reconstruction image recorded by a magnetic resonance device |
| CN102419426A (en) * | 2010-09-07 | 2012-04-18 | 西门子公司 | Method for imaging a portion of an examination object in a magnetic resonance scanner |
| CN102680927A (en) * | 2011-03-17 | 2012-09-19 | 西门子公司 | Method for determining magnetic resonance data |
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