CN104644172B - The control method and system of black blood in time reversal stable state precession fast imaging sequences - Google Patents
The control method and system of black blood in time reversal stable state precession fast imaging sequences Download PDFInfo
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- CN104644172B CN104644172B CN201310603946.2A CN201310603946A CN104644172B CN 104644172 B CN104644172 B CN 104644172B CN 201310603946 A CN201310603946 A CN 201310603946A CN 104644172 B CN104644172 B CN 104644172B
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Abstract
The present invention relates to the control method and system of black blood in a kind of time reversal stable state precession fast imaging sequences.Methods described includes：Passage time inverts stable state precession fast imaging sequences scanning imagery；Apply the dephasing gradient of default size in scanning at least one direction in layer choosing, phase code and frequency coding.The control method and system of black blood in above-mentioned time reversal stable state precession fast imaging sequences, apply dephasing gradient during by scanning at least one direction in layer choosing, phase code, frequency coding, so that in the slower region of VPV, the inhibition of blood signal is improved, and then improves the quality of image.
Description
Technical field
The present invention relates to magnetic resonance imaging arts, in more particularly to a kind of time reversal stable state precession fast imaging sequences
The control method and system of black blood.
Background technology
Time reversal stable state precession fast imaging sequences（Time-reversed Fast Imaging with Steady-
State Precession or Contrast Enhanced Fourier Acquired Steady-state, CE-FAST）
It is a kind of T2 weightings（T2WI, T2-weighted imaging, T2 weighted imaging）Gradin-echo.Adopt
During with time reversal stable state precession fast imaging sequences scanning imagery, when vascular flow rate is slower, blood signal suppression effect compared with
Difference, i.e., black blood effect is poor, causes the picture quality of imaging poor.
The content of the invention
Based on this, it is necessary to which the problem of picture quality being imaged when slower for vascular flow rate is poor can be carried there is provided one kind
The control method of black blood in the time reversal stable state precession fast imaging sequences of the picture quality of height imaging.
In addition, there is a need to the time reversal stable state precession fast imaging sequence for providing a kind of picture quality that can improve imaging
The control system of black blood in row.
The control method of black blood in a kind of time reversal stable state precession fast imaging sequences, including：
Passage time inverts stable state precession fast imaging sequences scanning imagery；
Apply the dephasing ladder of preset strength in scanning at least one direction in layer choosing, phase code and frequency coding
Degree.
In one of the embodiments, methods described also includes：
Increase the intensity of the dephasing gradient.
In one of the embodiments, the step of intensity of the increase dephasing gradient includes：
Increase the amplitude of the dephasing gradient or the duration of the extension dephasing gradient.
In one of the embodiments, when the dephasing gradient is applied on layer choosing direction, the dephasing gradient it is pre-
If the gradient intensity of intensity and the layer choosing is into preset ratio.
In one of the embodiments, the preset ratio is 0.2 to 0.5.
The control system of black blood in a kind of time reversal stable state precession fast imaging sequences, including：
Scan module, stable state precession fast imaging sequences scanning imagery is inverted for passage time；
Add module, it is default for applying in scanning in layer choosing, phase code and frequency coding at least one direction
The dephasing gradient of intensity.
In one of the embodiments, the system also includes：
Regulate and control module, the intensity for increasing the dephasing gradient.
In one of the embodiments, the regulation and control module is additionally operable to increase described in amplitude or the extension of the dephasing gradient
The duration of dephasing gradient.
In one of the embodiments, when the dephasing gradient is applied on layer choosing direction, the dephasing gradient it is pre-
If the gradient intensity of intensity and the layer choosing is into preset ratio.
In one of the embodiments, the preset ratio is 0.2 to 0.5.
The control method and system of black blood in above-mentioned time reversal stable state precession fast imaging sequences, in layer during by scanning
Apply dephasing gradient in choosing, phase code, frequency coding at least one direction so that magnetic resonance signal is quicker for flowing
Sense, while not influenceing the signal of static organ or object, improves the inhibition of blood signal, and then improve image
Quality.
In addition, the intensity of increase dephasing gradient can further improve the effect that control blood flow suppresses.
Brief description of the drawings
Fig. 1 is a kind of stream of the control method of black blood in time reversal stable state precession fast imaging sequences in one embodiment
Cheng Tu；
Fig. 2 is the timing diagram that time reversal stable state precession fast imaging sequences are scanned；
Fig. 3 a scan belly image to be not added with dephasing gradient；
Fig. 3 b are plus dephasing gradient scans belly image；
Fig. 4 is the structural frames of the control system of black blood in time reversal stable state precession fast imaging sequences in one embodiment
Figure；
Fig. 5 is the structure of the control system of black blood in time reversal stable state precession fast imaging sequences in another embodiment
Block diagram；
Fig. 6 is the device architecture figure of time reversal stable state precession fast imaging.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in figure 1, being the control of black blood in a kind of time reversal stable state precession fast imaging sequences in one embodiment
The flow chart of method.The control method of black blood in the time reversal stable state precession fast imaging sequences, including：
Step 102, passage time reversion stable state precession fast imaging sequences scanning imagery.
Specifically, the echo time is the time point for producing magnetic resonance signal echo.
Step 104, preset strength is applied in scanning at least one direction in layer choosing, phase code and frequency coding
Dephasing gradient.
As shown in Fig. 2 the timing diagram scanned for time reversal stable state precession fast imaging sequences.Using time reversal stable state
Precession fast imaging sequences scan certain region of human body, and the imaging region of such as belly applies periodic radio-frequency pulse and acted on
Imaging region, makes the magnetization vector of imaging region reach resonance stable state.The setting of repetition time between pulse depends on imaging
The other factorses such as field strength, thickness, signal acquisition bandwidth and selective absorbing rate, in order to improve the signal to noise ratio of image, it should
Minimum value is got as far as possible.The gradient of layer choosing is used for the specific region during selective excitation is imaged so that radio-frequency pulse is only excited
The proton of specified location；Phase code is used to encode the space phase of magnetic resonance signal；Frequency coding is used for common to magnetic
The frequency of signal of shaking is encoded.Phase code and frequency coding are used to be spatially encoded magnetic resonance signal, mark imaging
The magnetic resonance signal gathered in region at diverse location, to produce MRI.Data acquisition is used for collecting magnetic resonance signal.
Phase rephasing gradient is used to offset phase encoding gradient；Frequency rephasing gradient is used to offset frequency encoding gradient；Layer choosing returns poly- ladder
Spend for offsetting layer choosing gradient.The poly- pulse of returning in layer choosing direction is put after collection so that free damping signal dephasing, is being read
When do not collect the signal, while spin echo composition be retained so that the spin echo composition can be in next excitation cycle
Inside collect.
When the dephasing gradient is applied on layer choosing direction, the preset strength of the dephasing gradient and the gradient intensity of the layer choosing
Into preset ratio.The preset ratio is 0.2 to 0.5, but not limited to this.
The control method of black blood in above-mentioned time reversal stable state precession fast imaging sequences, in layer choosing, phase during by scanning
Apply dephasing gradient at least one direction in position coding, frequency coding so that in the region that VPV is slower, improve blood
The inhibition of liquid signal, and then improve the quality of image.
Fig. 3 a scan belly image to be not added with dephasing gradient；Fig. 3 b scan belly image to increase dephasing gradient.Figure
In 3a in the signified liver of arrow blood vessel and abdomen arterial signal apparently higher than Fig. 3 b.
In one embodiment, in above-mentioned time reversal stable state precession fast imaging sequences black blood control method, also wrap
Include：Increase the intensity of the dephasing gradient.The intensity of increase dephasing gradient can further improve the effect that control blood flow suppresses.
The step of intensity of the increase dephasing gradient, includes：Increase the amplitude of the dephasing gradient or extend the dephasing gradient
Duration.
As shown in figure 4, in a kind of time reversal stable state precession fast imaging sequences black blood control system, including scanning mould
Block 420 and add module 440.Wherein：
Scan module 420 is used for passage time reversion stable state precession fast imaging sequences scanning imagery.
Add module 440, it is pre- for applying in scanning in layer choosing, phase code and frequency coding at least one direction
If the dephasing gradient of intensity.
When the dephasing gradient is applied on layer choosing direction, the preset strength of the dephasing gradient and the gradient intensity of the layer choosing
Into preset ratio.The preset strength of the dephasing gradient and the gradient intensity of the layer choosing are into preset ratio.The preset ratio be 0.2 to
0.5, but not limited to this, it can specifically set as needed.
The control system of black blood in above-mentioned time reversal stable state precession fast imaging sequences, in layer choosing, phase during by scanning
Apply dephasing gradient at least one direction in position coding, frequency coding so that in the region that VPV is slower, improve blood
The inhibition of liquid signal, and then improve the quality of image.
As shown in figure 5, being the control system of black blood in time reversal stable state precession fast imaging sequences in another embodiment
The structured flowchart of system.The control system of black blood in the time reversal stable state precession fast imaging sequences, except including scan module
420 and add module 440, in addition to regulation and control module 460.
Regulation and control module 460 is used for the intensity for increasing the dephasing gradient.It is somebody's turn to do specifically, the regulation and control module 460 is additionally operable to increase
The amplitude of dephasing gradient or the duration for extending the dephasing gradient.
The intensity of increase dephasing gradient can further improve the effect that control blood flow suppresses.
As shown in fig. 6, being the device architecture figure of time reversal stable state precession fast imaging.In magnetic resonance protective cover in Fig. 6
Magnet 601, gradient coil 602 and radio-frequency coil 603 are provided with 600, the device also includes being located at outside magnetic resonance protective cover 600
Gradient signal amplifier 605, the gradient signal amplifier 605 being connected with gradient coil 604 are put the gradient signal of detection
Obtain gradient pulse sequence 606 greatly, and be conveyed to processor 607 being handled.The device also includes being connected with radio-frequency coil 603
Radio frequency signal detector 608, be connected with radio frequency signal detector 608 digital quantizer 609, be connected with radio-frequency coil 603
Radio frequency signal amplifiers 610, the digital quantizer 609 is connected with processor 607.Radio frequency signal amplifiers 610 believe radio frequency
Number amplification obtains rf pulse sequence 611, and delivers this to processor 607 and handled, and processor 607 is to gradient pulse sequence
After row 606 and rf pulse sequence 611 are handled, shown by display 612, also can be 613 dozens by printing device
Print.During the device scanning imagery of the time reversal stable state precession fast imaging, patient 621 is lain low on sick bed 620, patient is allowed
621 are in radio-frequency coil magnetic field and gradient coil magnetic field, are then scanned.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. the control method of black blood in a kind of time reversal stable state precession fast imaging sequences, including：
Passage time reversion stable state precession fast imaging sequences scanning imagery region；
Apply the dephasing gradient of preset strength in scanning at least one direction in layer choosing, phase code and frequency coding, its
In, the gradient of layer choosing is used for the specific region during selective excitation is imaged so that radio-frequency pulse only excites the proton of specified location.
2. the control method of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 1
It is, methods described also includes：
Increase the intensity of the dephasing gradient.
3. the control method of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 2
It is, includes the step of the intensity of the increase dephasing gradient：
Increase the amplitude of the dephasing gradient or the duration of the extension dephasing gradient.
4. the control method of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 1
It is, when the dephasing gradient is applied on layer choosing direction, the preset strength of the dephasing gradient and the gradient of the layer choosing
Intensity is into preset ratio.
5. the control method of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 4
It is, the preset ratio is 0.2 to 0.5.
6. the control system of black blood in a kind of time reversal stable state precession fast imaging sequences, it is characterised in that including：
Scan module, for passage time reversion stable state precession fast imaging sequences scanning imagery region；
Add module, for applying preset strength at least one direction in layer choosing, phase code and frequency coding in scanning
Dephasing gradient, wherein, the gradient of layer choosing is used for the specific region during selective excitation is imaged so that radio-frequency pulse only excites finger
Position the proton put.
7. the control system of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 6
It is, the system also includes：
Regulate and control module, the intensity for increasing the dephasing gradient.
8. the control system of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 7
It is, the regulation and control module is additionally operable to increase the amplitude of the dephasing gradient or the duration of the extension dephasing gradient.
9. the control system of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 6
It is, when the dephasing gradient is applied on layer choosing direction, the preset strength of the dephasing gradient and the gradient of the layer choosing
Intensity is into preset ratio.
10. the control system of black blood, its feature in time reversal stable state precession fast imaging sequences according to claim 9
It is, the preset ratio is 0.2 to 0.5.
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| CN109917315B (en) * | 2019-04-30 | 2021-09-28 | 上海联影医疗科技股份有限公司 | Magnetic resonance imaging scanning method, magnetic resonance imaging scanning device, computer equipment and storage medium |
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| CN101836123A (en) * | 2006-04-20 | 2010-09-15 | 皇家飞利浦电子股份有限公司 | Black-blood steady-state free precession magnetic resonance imaging |
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| JP5502682B2 (en) * | 2010-09-28 | 2014-05-28 | 株式会社東芝 | Magnetic resonance imaging system |
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| US5590655A (en) * | 1993-09-20 | 1997-01-07 | Hussman; Karl L. | Frameless laser guided stereotactic localization system |
| CN1573351A (en) * | 2003-06-05 | 2005-02-02 | 西门子公司 | Magnetic resonance apparatus and operating method therefor employing a steady-state pulse sequence |
| CN101836123A (en) * | 2006-04-20 | 2010-09-15 | 皇家飞利浦电子股份有限公司 | Black-blood steady-state free precession magnetic resonance imaging |
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