CN108652624A - A kind of perspective electrocardio triggering method and device - Google Patents
A kind of perspective electrocardio triggering method and device Download PDFInfo
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- CN108652624A CN108652624A CN201710209503.3A CN201710209503A CN108652624A CN 108652624 A CN108652624 A CN 108652624A CN 201710209503 A CN201710209503 A CN 201710209503A CN 108652624 A CN108652624 A CN 108652624A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
Abstract
Embodiment of the present invention discloses a kind of perspective electrocardio triggering method and device.Method includes：Apply prospective acquisition correction (PACE) sequence and detect heart blood flow curve in the learning period, trigger point parameter is calculated based on the heart blood flow curve；When, when the triggering phase searching out trigger point based on trigger point parameter, trigger signal being sent out to imaging sequence using the PACE sequences.The usual PACE technologies applied to respiration gate control by being applied in cardiac gating, can removing the tedious work caused by arrangement electrocardio (ECG) electrode from and eliminating patient's discomfort by embodiment of the present invention.In addition, embodiment of the present invention also carries out the optimization in sequence, parameter and positioning to PACE technologies, and breath holding time is reduced by sharing the learning period.
Description
Technical field
The present invention relates to medical device technical fields, more particularly to a kind of perspective electrocardio triggering method and device.
Background technology
Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is with computer technology, electronic circuit skill
Art, superconduction body technique development and a kind of biomagnetism nuclear spin imaging technique for developing rapidly.It using magnetic field with penetrate
Frequency pulse makes the proton (i.e. H+) of precession in tissue that vibration generation radiofrequency signal occur, and handles and is imaged through computer.When
Object is placed in magnetic field, with electromagnetic wave irradiation appropriate it, be allowed to resonate, then analyze it discharge electromagnetic wave, so that it may
To learn the nuclear position and the type that are constituted this object, it can be depicted as the accurate stereopsis of interior of articles accordingly.
For example, the animation for the serial section that can be obtained by MRI scan human brain, by the crown, until
Foot.
It in current cardiac MRI, is influenced caused by image to reduce or eliminate heart movement, generally uses electrocardio
Image amendment is made in gate or electrocardio triggering, and wherein ecg-gating is usually retrospective gated technology, and electrocardio triggering is usually to look forward to the prospect
Property gating technology.
It is acquired with MRI data currently, electrocardio (Electrocardiogram, ECG) signal is widely used and synchronizes heart.So
And this needs arranges that multiple ECG electrodes, patient may not feel well with patient, and increase additional electrode cloth
Set the time.
In addition, ECG signal is also easy to be interfered by factors such as blood flow, magnetic field and imaging sequences.
Invention content
A kind of perspective electrocardio triggering method of embodiment of the present invention proposition and device.
The technical solution of embodiment of the present invention is as follows：
A kind of perspective electrocardio triggering method, including：
Apply prospective acquisition correction sequence and detect heart blood flow curve in the learning period, is based on the cardiac blood liquid stream
Moving curve calculates trigger point parameter；
When using the prospective acquisition correction sequence when the triggering phase searching out trigger point based on trigger point parameter, Xiang Cheng
As sequence sends out trigger signal.
In one embodiment, the number of the imaging sequence is multiple, and the multiple imaging sequence is corresponding multiple
Heart scanning agreement shares the learning period.
In one embodiment, the application prospective acquisition correction sequence includes：
Apply quick scan protocols to obtain positioning picture；
The area-of-interest of the prospective acquisition correction sequence is arranged in the descending aorta region of the positioning picture, it is described
The layer direction of area-of-interest is arranged in Coronal, and the readout gradient direction of the area-of-interest is arranged as blood flow side
To.
In one embodiment, the trigger point parameter includes Wave crest and wave trough threshold value；It is described to be sought based on trigger point parameter
The trigger point is looked for include：
Reception window is determined based on the Wave crest and wave trough threshold value；
Point in the reception window is determined as the trigger point.
In one embodiment, it is being touched based on the searching of trigger point parameter in the triggering phase using prospective acquisition correction sequence
Before hair point, this method further includes：
Apply non-selective inversion recovery pulse, longitudinal magnetization vector is inverted to forward direction.
In one embodiment, this method further includes：
Based on the phase between heart blood flow curve calculating RR；
To the phase between the imaging sequence transmission RR；
Imaging sequence acquires cardiac shape image data, wherein the imaging sequence after receiving the trigger signal
The priming pulse of row had based on the phase determined trigger delay time between the RR.
In one embodiment, this method further includes at least one of lower column processing to improve prospective acquisition correction
The temporal resolution of sequence：
It improves and reads bandwidth；Reduce number of phase encoding；Reduce priming pulse number.
A kind of perspective cardiac trigger apparatus, including：
Learning period processing module, it is bent in learning period detection heart blood flowing for applying prospective acquisition correction sequence
Line calculates trigger point parameter based on the heart blood flow curve；
Triggering phase processing module is based on trigger point parameter using the prospective acquisition correction sequence for working as in the triggering phase
When searching out trigger point, trigger signal is sent out to imaging sequence.
In one embodiment, the number of the imaging sequence is multiple, and the multiple imaging sequence is corresponding multiple
Heart scanning agreement shares the learning period.
In one embodiment, learning period processing module, for applying quick scan protocols to obtain positioning picture；Institute
The area-of-interest of the prospective acquisition correction sequence is arranged in the descending aorta region for stating positioning picture, the area-of-interest
Layer direction is arranged in Coronal, and the readout gradient direction of the area-of-interest is arranged as direction of flow of blood.
In one embodiment, learning period processing module is additionally operable to calculate RR based on the heart blood flow curve
Between the phase, to the imaging sequence send the RR between the phase；
The device further includes：Sweep time processing module, for enabling imaging sequence after receiving the trigger signal,
Cardiac shape image data is acquired, wherein the priming pulse of the imaging sequence has based on phase determined triggering between the RR
Delay time.
It can be seen from the above technical proposal that embodiment of the present invention includes：Apply prospective acquisition correction sequence learning
The habit phase detects heart blood flow curve, and trigger point parameter is calculated based on heart blood flow curve；When utilizing prospective acquisition
Correction sequence sends out trigger signal when the triggering phase searching out trigger point based on trigger point parameter to imaging sequence.The present invention is real
Mode is applied by the way that the usual prospective acquisition correction sequence applied to respiration gate control to be applied in cardiac gating, cloth can be removed from
It sets the tedious work caused by ECG electrode and eliminates patient's discomfort.
In addition, high time resolution can also be arranged to optimize prospective acquisition correction technique in embodiment of the present invention, from
And sweep time is reduced, and reduce breath holding time by sharing the learning period.
Moreover, embodiment of the present invention also optimizes the area-of-interest arrangement of prospective acquisition correction sequence and reads ladder
Direction is spent, temporal resolution can be further increased, and improve image quality.
Description of the drawings
Fig. 1 is the flow chart according to the perspective electrocardio triggering method of embodiment of the present invention.
Fig. 2 is to arrange area-of-interest (Region Of in descending aorta region according to embodiment of the present invention
Interest, ROI) schematic diagram.
Fig. 3 is the cardiac blood detected according to embodiment of the present invention two dimension prospective acquisition correction sequence (2D-PACE)
Liquid stream moving curve schematic diagram.
Fig. 4 is the flow chart of the imaging process triggered according to embodiment of the present invention 2D-PACE sequences.
Fig. 5 is to be triggered and the contrast schematic diagram using the triggering of 2D-PACE sequence electrocardios using ECG signal electrocardio.
Fig. 6 is using the acquired cardiac shape image schematic diagram of ECG signal electrocardio triggering.
Fig. 7 is to be shown using the acquired cardiac shape image of 2D-PACE sequence electrocardios triggering according to embodiment of the present invention
It is intended to.
Fig. 8 is the structure chart according to the perspective cardiac trigger apparatus of embodiment of the present invention.
Specific implementation mode
In order to make technical scheme of the present invention and advantage be more clearly understood, below in conjunction with drawings and the embodiments, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are only used to illustrative illustrate originally
Invention, is not intended to limit the scope of protection of the present invention.
It is succinct and intuitive in order to what is described, hereafter by describing several representative embodiments come the side to the present invention
Case is illustrated.A large amount of details is only used for helping to understand the solution of the present invention in embodiment.However, it will be apparent that the present invention
Technical solution can be not limited to these details when realizing.In order to avoid unnecessarily having obscured the solution of the present invention, some realities
It applies mode not described meticulously, but only gives frame.Hereinafter, " comprising " refers to " including but not limited to ", " root
According to ... " refer to " according at least to ..., but be not limited to according only to ... ".Due to the speech habits of Chinese, hereinafter without spy
When not pointing out the quantity of an ingredient, it is meant that the ingredient is either one or more, or can be regarded as at least one.
Those skilled in the art will appreciate prospective acquisition correction (Prospective Acquisition
CorrEction, PACE) technology as a kind of respiratory gating technology, can effectively remove respiration artefacts.When PACE technology applications
When respiration gate control, low-angle excitation gradin-echo is continually scanned for, the two dimensional image of low resolution is acquired, obtains trigger point
To trigger the scanning of imaging sequence.
Applicant has found by a large number of experiments：The usual PACE technologies applied to respiration gate control are applied to cardiac gating
When, trigger point can be equally obtained to trigger the scanning of imaging sequence, and is removed from and being arranged caused by ECG electrode in cardiac gating
Tedious work and to eliminate patient uncomfortable.
Fig. 1 is the flow chart according to the perspective electrocardio triggering method of embodiment of the present invention.
As shown in Figure 1, this method includes：
Step 101：Apply PACE sequences to detect heart blood flow curve in the learning period, based on heart blood flowing song
Line computation trigger point parameter.
The whole cycle of electrocardio triggering includes learning period and triggering phase.Incipient stage is the learning period, in the learning period, is applied
PACE sequences are to detect heart blood flow curve.Wherein, the run time of learning period can with manual setting (such as 3 seconds, 5 seconds or
10 seconds, etc.).After the learning period, trigger point parameter can be calculated based on heart blood flow curve, consequently facilitating after
The continuous triggering phase finds trigger point using trigger point parameter.
In view of the natural wide gap between cardiac gating and respiration gate control, in order to usually be applied to the PACE technologies of respiration gate control
It is applied in cardiac gating, embodiment of the present invention preferably optimizes PACE sequences.Specific Optimized Measures include at least：It is logical
It crosses raising to read bandwidth, reduce number of phase encoding or reduce priming pulse number, improves the temporal resolution of PACE sequences.By excellent
After change, the time of the one frame image of PACE sequence acquisitions of embodiment of the present invention shortens to 10ms from original 120ms, can be with
Significantly reduce sweep time.
In addition, applicant is anisotropic in view of electrocardio triggering and the significance difference of respiration gate control, the ROI cloth of PACE sequences is optimized
It sets.
In one embodiment, apply PACE sequences in step 101 to specifically include：Apply quick scan protocols to obtain
Positioning is as (localizer)；The ROI of PACE sequences is arranged in the descending aorta region of positioning picture, and the layer direction of ROI is arranged in hat
The readout gradient direction of shape position, ROI is arranged as direction of flow of blood.It is performed simultaneously specifically, fast imaging sequences may be used
Hat, the positioning of three direction of resultant axis are to obtain positioning picture.
When by ROI region be arranged in positioning picture descending aorta region when, ROI by other positions influence of noise compared with
It is small, it can obtain preferably acquiring signal.
Fig. 2 is to arrange the schematic diagram of ROI in descending aorta region according to embodiment of the present invention.
In fig. 2, ROI is arranged in the descending aorta region of positioning picture, and the layer direction of ROI is arranged in Coronal, and ROI
Readout gradient direction be arranged as direction of flow of blood.After arranging ROI according to Fig. 2 illustrated embodiments, ROI is by other positions
Influence of noise it is smaller.Moreover, because the direction of readout gradient be along blood flow direction (such as：From top to bottom), double
To readout gradient the phase information of the ROI on descending aorta can be made to be amplified, substitute the two-way gradient of Flow sensitive, make
Temporal resolution is further improved.
In the foregoing description, it elaborates on how to arrange ROI in descending aorta region.Those skilled in the art can anticipate
Know, this arrangement is only exemplary.In fact, embodiment of the present invention can be in any position of arteriosomes
Arrange ROI.
Preferably, PACE sequences specifically may be embodied as 2D-PACE sequences.Fig. 3 is according to embodiment of the present invention 2D-
The heart blood flow curve schematic diagram that PACE is detected.
Step 102：When using PACE sequences when the triggering phase searching out trigger point based on trigger point parameter, to imaging sequence
Send out trigger signal.
It is the triggering phase after learning period.It is interim triggering, it is based on the calculated trigger point parameter of heart blood flow curve
PACE sequences are delivered to, PACE sequences continue to run with, and the trigger point to conform to a predetermined condition is found according to trigger point parameter.When
After detecting trigger point, PACE sequences are out of service, and trigger signal is sent out to trigger imaging sequence to imaging sequence (such as db_tse)
Column scan.After imaging sequence receives trigger signal, start to execute imaging sequence scanning process.In imaging sequence scanning process,
Imaging sequence continuous collecting image data.After image data acquiring is complete, PACE sequences are reruned to join further according to trigger point
Number continues to detect next trigger point.After detecting next trigger point, PACE sequences send out triggering to imaging sequence again
Signal is to continue to trigger imaging sequence scanning.Entire triggering collection process recycles always, until Image Acquisition finishes.
In one embodiment, trigger point parameter includes Wave crest and wave trough threshold value.In step 102 based on trigger point parameter
Finding trigger point includes：Reception window is determined based on Wave crest and wave trough threshold value；Point in reception window is determined as trigger point.Specifically
Ground：First, PACE sequences are based on preset reception window setting information (for example, window height and window width) and Wave crest and wave trough threshold value is true
Make the range of reception window.Then, the point within the scope of reception window is determined as trigger point by PACE sequences again.
In one embodiment, this method further includes：
After the learning period, based on heart blood flow curve calculate RR between the phase, and to imaging sequence send RR between the phase.Imaging
Phase between sequential reception RR, and it is based on phase execution imaging sequence scanning between RR after receiving the trigger signal.It is scanned in imaging sequence
In, imaging sequence continuous collecting cardiac shape image data, the wherein priming pulse of imaging sequence have true based on the phase between RR
The fixed trigger delay time.
Usually there are multiple heart scanning agreements in heart scanning workflow.If each heart scanning agreement is carried out
The electrocardio trigger flow stated, then each heart scanning agreement can run a learning period.Since heart scanning is mostly to hold one's breath
Scanning, multiple learning period extend the breath holding time of patient, increase the cooperation difficulty of patient.
For example, 4 heart scanning agreements are suppose there is, respectively heart scanning agreement A, heart scanning agreement B, heart scanning
Agreement C and heart scanning agreement D.The learning period of each heart scanning agreement is 3 seconds.Correspondingly, one 4 study are co-existed in
Phase, total time learning period be 43 seconds, i.e., 12 seconds, this not only increased total sweep time, and also adds patient's
Total breath holding time.
Preferably, it the learning period can will be separately separated out, respectively during the triggering collection of heart scanning workflow
Heart scanning agreement share the learning period.Wherein, the long period can be had by the learning period that respective heart scanning agreement shares.
In this way, in entire heart scanning workflow, a learning period is only run, not only saves total sweep time, while also subtracting
The short breath holding time of each heart scanning agreement.
In one embodiment, the number of imaging sequence is multiple, the corresponding multiple heart scannings of multiple imaging sequences
Agreement shares the learning period.
Example in undertaking, for example, 4 heart scanning agreements are suppose there is, respectively heart scanning agreement A, heart scanning agreement
B, heart scanning agreement C and heart scanning agreement D.Setting shared time learning period is 10 seconds.It is determined based on the shared learning period
Heart blood flow curve, phase and Wave crest and wave trough threshold value between RR can be calculated.Moreover, by phase and wave crest between calculated RR
Trough threshold value is separately sent to heart scanning agreement A, heart scanning agreement B, heart scanning agreement C and heart scanning agreement D.The heart
Dirty scan protocols A, heart scanning agreement B, heart scanning agreement C and heart scanning agreement D are interim in respective triggering, respectively base
Trigger point is respectively determined in Wave crest and wave trough threshold value, and imaging sequence scanning is respectively executed based on the phase between RR.As it can be seen that in entire heart
In scanning work stream, learning period of operation has also shortened the breath holding time of patient to save total sweep time.
Below by taking 2D-PACE sequences as an example, the exemplary flow of the imaging process of perspective electrocardio triggering is described in detail.
Fig. 4 is the flow chart of the imaging process triggered according to embodiment of the present invention 2D-PACE sequences.
As described in Figure 4, this method includes：
Step 401：Start the learning period, operation 2D-PACE sequences are to detect heart blood flow curve.Wherein, by 2D-
The ROI of PACE sequences is arranged in the descending aorta region of positioning picture, and the layer direction of ROI is arranged in Coronal, the readout gradient of ROI
Direction is arranged as direction of flow of blood.Moreover, bandwidth is read by raising, reduce number of phase encoding and reduces priming pulse number,
Improve the temporal resolution of PACE sequences.
Step 402：Judge whether the duration of learning period is more than the predetermined time (such as 10 seconds), if so, executing step
Rapid 403 and its subsequent step, otherwise return to step 401.
Step 403~step 404：The heart blood flow curve obtained based on the learning period calculates separately Wave crest and wave trough threshold value
The phase between RR.
Step 405：Start the triggering phase, 2D-PACE sequences are based on preset reception window setting information and Wave crest and wave trough
Threshold value determines reception window.
Step 406：Judge whether find trigger point in reception window, if so, executing step 407 and its subsequent step；
Otherwise, 405 are returned to step.
Step 407：Start sweep time, the phase between 404 calculated RR of imaging sequence (such as T1 weighting protocols) obtaining step,
And start to acquire image data based on the phase between RR.
Step 408：Judge whether to get all image datas, if so, executing step 409；Otherwise, it returns and executes
Step 405.
Step 409：Terminate this flow.
When imaging sequence is T1 weighting protocols, due to 2D-PACE sequences with the blood stream peaks in the aorta that detects
For trigger point, and ECG is using the QRS wave detected as trigger point, the delay in existence time between the two, T1 weighting protocols when
Sequence needs, which synchronize, to be adjusted.
In one embodiment, this method further includes：After receiving the trigger signal, acquisition is heart-shaped for imaging sequence
State image data, the wherein priming pulse of imaging sequence had based on the phase determined trigger delay time between RR.
Moreover, when being imaged the sequence ends and 2D-PACE sequences rerun, the longitudinal magnetization vector of blood is still in instead
Turn direction, this can influence the blood phase signal that PACE sequence detections arrive, therefore need to be added before PACE sequences rerun
The longitudinal magnetization vector reversion of blood is returned to forward direction by one non-selective inversion recovery pulse.
In one embodiment, using 2D-PACE correction sequences the searching triggering of trigger point parameter is being based in the triggering phase
Before point, this method further includes：Apply non-selective inversion recovery pulse, longitudinal magnetization vector is inverted to forward direction.
Comparison is triggered and the process using the triggering of 2D-PACE sequence electrocardios using ECG signal electrocardio to graphically below.
Fig. 5 is to be triggered and the contrast schematic diagram using the triggering of 2D-PACE sequence electrocardios using ECG signal electrocardio.Wherein, it adopts
When being triggered with ECG signal electrocardio, need that ECG trigger devices additionally are arranged.In Figure 5, sequence 1 (Seq.1) is using ECG signal
Pulse train when electrocardio triggers；Sequence 2 (Seq.2) is pulse train when being triggered using 2D-PACE sequence electrocardios.
As shown in the sequence 1 of Fig. 5, after ECG finds trigger point and sends out trigger signal (Trigger), run immediately black
Blood priming pulse (DB) then executes data in end diastole and acquires (TSE).
As shown in the sequence 2 of Fig. 5,2D-PACE sequences are repeatedly run, until detecting trigger point and sending out triggering letter
Number.According to the phase between the calculated RR of heart blood flow curve, trigger delay time TD can be obtained.Wherein：Phase-between TD=RR
TT-TR.Herein, TT is the time (such as 100ms) for keeping for operation 2D-PACE sequences；TR=300ms.As it can be seen that utilizing 2D-
After PACE finds trigger point and sends out trigger signal, black blood priming pulse is just run after trigger delay time TD.Black blood is accurate
Standby pulse includes the inversion recovery pulse of a non-selective inversion recovery pulse and a selectivity.Black blood priming pulse it is non-
Selective inversion restores pulse and inverts the signal of intrathoracic (including blood) in a organized way.Then, in end diastole,
Data acquisition is executed by imaging sequence.By 300ms, terminate imaging sequence.At this point, the longitudinal magnetization vector of blood is still in instead
Turn direction, this can influence the phase signal for the blood that PACE sequence detections arrive.Therefore, terminating imaging sequence and PACE sequence weights
Before new operation, apply additional non-selective inversion recovery pulse (non-sel.IR), by the longitudinal magnetization vector of blood
The phase fluctuation situation of blood can correctly be detected by inverting the PACE sequences for returning to forward direction, therefore reruning, under monitoring
One trigger point.
Fig. 6 is using the acquired cardiac shape image schematic diagram of ECG signal electrocardio triggering；Fig. 7 is according to of the invention real
Mode is applied using the acquired cardiac shape image schematic diagram of 2D-PACE sequence electrocardios triggering.It is touched as it can be seen that being scanned with 2D-PACE
Obtained image is sent out at least to be equal or better than the image triggered with ECG.
Based on foregoing description, the application also proposed a kind of perspective cardiac trigger apparatus.
According to the structure chart of the perspective cardiac trigger apparatus of embodiment of the present invention.
As shown in figure 8, the device includes：
Learning period processing module 801 detects heart blood flow curve in the learning period for applying PACE sequences, is based on the heart
Dirty blood flow curve calculates trigger point parameter；
Triggering phase processing module 802 searches out triggering in the triggering phase using PACE sequences for working as based on trigger point parameter
When point, trigger signal is sent out to imaging sequence.
In one embodiment, the number of imaging sequence is multiple, the corresponding multiple heart scannings of multiple imaging sequences
Agreement shares the learning period.
In one embodiment, learning period processing module 801, for applying quick scan protocols to obtain positioning picture；
The ROI of PACE sequences is arranged in the descending aorta region of positioning picture, and the layer direction of ROI is arranged in Coronal, the readout gradient of ROI
Direction is arranged as direction of flow of blood.
In one embodiment, learning period processing module 801 is additionally operable to based between heart blood flow curve calculating RR
Phase, to the phase between the imaging sequence transmission RR；
The device further includes：Sweep time processing module 803, for enabling imaging sequence after receiving the trigger signal,
Cardiac shape image data is acquired, when wherein the priming pulse of imaging sequence has trigger delay determined based on the phase between RR
Between.
The application programming interfaces that certain specification can be followed, the perspective electrocardio that embodiment of the present invention is proposed trigger
Method is written as the plug-in card program being installed in magnetic resonance imaging control host, PC, mobile terminal etc., can also be by it
Application program is encapsulated as so that user voluntarily downloads use.
The perspective electrocardio that can be proposed embodiment of the present invention by the storing mode of instruction or instruction set storage
Triggering method is stored on various storage mediums.These storage mediums include but is not limited to：Floppy disk, CD, DVD, hard disk,
Flash memory etc..
Furthermore it is also possible to be applied to the perspective electrocardio triggering method that embodiment of the present invention is proposed based on flash memory
In the storage medium of (Nand flash), such as USB flash disk, CF cards, SD card, SDHC cards, mmc card, SM cards, memory stick, xD cards etc..
In conclusion embodiment of the present invention includes：Apply PACE sequences and detect heart blood flow curve in the learning period,
Trigger point parameter is calculated based on heart blood flow curve；When being searched out based on trigger point parameter in the triggering phase using PACE sequences
When trigger point, trigger signal is sent out to imaging sequence.Embodiment of the present invention is by will usually be applied to the PACE of respiration gate control
Sequence is applied in cardiac gating, can be removed the tedious work caused by arrangement ECG electrode from and be eliminated patient's discomfort.
In addition, high time resolution can also be arranged to optimize PACE technologies, to reduce scanning in embodiment of the present invention
Time, and reduce breath holding time by sharing the learning period.
Moreover, embodiment of the present invention also optimizes ROI arrangements and the readout gradient direction of PACE sequences, it can be further
Temporal resolution is improved, and improves image quality.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in the protection of the present invention
Within the scope of.
Claims (11)
1. a kind of perspective electrocardio triggering method, which is characterized in that including：
Apply prospective acquisition correction sequence and detects heart blood flow curve in the learning period, it is bent based on heart blood flowing
Line computation trigger point parameter；
When using the prospective acquisition correction sequence when the triggering phase searching out trigger point based on trigger point parameter, to imaging sequence
Row send out trigger signal.
2. perspective electrocardio triggering method according to claim 1, which is characterized in that the number of the imaging sequence is more
A, the corresponding multiple heart scanning agreements of the multiple imaging sequence share the learning period.
3. perspective electrocardio triggering method according to claim 1, which is characterized in that the application prospective acquisition correction
Sequence includes：
Apply quick scan protocols to obtain positioning picture；
Arrange that the area-of-interest of the prospective acquisition correction sequence, the sense are emerging in the descending aorta region of the positioning picture
The layer direction in interesting region is arranged in Coronal, and the readout gradient direction of the area-of-interest is arranged as direction of flow of blood.
4. perspective electrocardio triggering method according to claim 1, which is characterized in that the trigger point parameter includes wave crest
Trough threshold value；It is described to include based on trigger point parameter searching trigger point：
Reception window is determined based on the Wave crest and wave trough threshold value；
Point in the reception window is determined as the trigger point.
5. perspective electrocardio triggering method according to claim 1, which is characterized in that utilizing prospective acquisition correction sequence
Before the triggering phase is listed in based on trigger point parameter searching trigger point, this method further includes：
Apply non-selective inversion recovery pulse, longitudinal magnetization vector is inverted to forward direction.
6. perspective electrocardio triggering method according to claim 1, which is characterized in that this method further includes：
Based on the phase between heart blood flow curve calculating RR；
To the phase between the imaging sequence transmission RR；
Imaging sequence acquires cardiac shape image data after receiving the trigger signal, wherein the imaging sequence
Priming pulse had based on the phase determined trigger delay time between the RR.
7. the perspective electrocardio triggering method according to any one of claim 1-6, which is characterized in that this method further includes
At least one of lower column processing is to improve the temporal resolution of prospective acquisition correction sequence：
It improves and reads bandwidth；Reduce number of phase encoding；Reduce priming pulse number.
8. a kind of perspective cardiac trigger apparatus, which is characterized in that including：
Learning period processing module detects heart blood flow curve, base for applying prospective acquisition correction sequence in the learning period
Trigger point parameter is calculated in the heart blood flow curve；
Triggering phase processing module is found in the triggering phase based on trigger point parameter for working as using the prospective acquisition correction sequence
When to trigger point, trigger signal is sent out to imaging sequence.
9. perspective cardiac trigger apparatus according to claim 8, which is characterized in that
The number of the imaging sequence is multiple, and the corresponding multiple heart scanning agreements of the multiple imaging sequence share
The habit phase.
10. perspective cardiac trigger apparatus according to claim 8, which is characterized in that
Learning period processing module, for applying quick scan protocols to obtain positioning picture；In the descending aorta area of the positioning picture
Domain arranges that the area-of-interest of the prospective acquisition correction sequence, the layer direction of the area-of-interest are arranged in Coronal,
The readout gradient direction of the area-of-interest is arranged as direction of flow of blood.
11. perspective cardiac trigger apparatus according to claim 8, which is characterized in that
Learning period processing module is additionally operable to, based on the phase between heart blood flow curve calculating RR, send out to the imaging sequence
Send the phase between the RR；
The device further includes：
Sweep time processing module acquires cardiac shape image for enabling imaging sequence after receiving the trigger signal
Data, wherein the priming pulse of the imaging sequence had based on the phase determined trigger delay time between the RR.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114076913A (en) * | 2020-08-19 | 2022-02-22 | 西门子(深圳)磁共振有限公司 | Magnetic resonance imaging method and device triggered by prospective acquisition correction sequence |
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