CN104545918A - Non-contract enhanced magnetic resonance venography imaging method - Google Patents

Non-contract enhanced magnetic resonance venography imaging method Download PDF

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CN104545918A
CN104545918A CN201410841437.8A CN201410841437A CN104545918A CN 104545918 A CN104545918 A CN 104545918A CN 201410841437 A CN201410841437 A CN 201410841437A CN 104545918 A CN104545918 A CN 104545918A
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arteries
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CN104545918B (en
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苏适
谢国喜
张晓咏
史彩云
李德彪
樊昭阳
郑海荣
刘新
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Shenzhen Institute of Advanced Technology of CAS
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    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
    • A61B5/721—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured

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Abstract

The invention provides a non-contract enhanced magnetic resonance venography imaging method. The non-contract enhanced magnetic resonance venography imaging method includes combining balanced steady-state free precession with specific models with delay alternating with nutation for tailored excitation, and acquiring images to obtain images with suppressed artery blood vessels and suppressed vein blood vessels; combining motion-sensitized driven equilibrium models with the balanced steady-state free precession, and acquiring images to obtain images with suppressed artery blood vessels; subtracting the images with the suppressed artery blood vessels from the images with the suppressed artery blood vessels and the suppressed vein blood vessels to obtain images of vein blood vessels. The non-contract enhanced magnetic resonance venography imaging method has the advantage that the images with suppressed blood vessel surrounding tissues, suppressed artery blood vessels and highlighted vein blood vessels can be obtained by the aid of the non-contract enhanced magnetic resonance venography imaging method.

Description

Non-contrasted magnetic resonance phlebography formation method
Technical field
The present invention relates to magnetic resonance imaging arts, espespecially a kind of non-contrasted magnetic resonance phlebography formation method.
Background technology
Magnetic resonance angiography imaging can be divided into two large classes, whether uses contrast medium according in imaging process, can be divided into CE-MRA Contrast Enhanced MRA's imaging and the imaging of non-contrasted magnetic resonance angiography.CE-MRA Contrast Enhanced MRA's imaging is by the use (as gadolinium) of contrast medium, have the display of angiostenosis degree truer, the advantage such as more reliable and arterial-venous that can be shown multiple location by a shot to the display of lumen of vessels, but, research in recent years shows, the gadolinium contrast medium used in CE-MRA Contrast Enhanced MRA's imaging may cause serious untoward reaction, as kidney source sexual system fibrosis, and the price of contrast medium costliness makes the high cost of CE-MRA Contrast Enhanced MRA's imaging, meanwhile, the progress of magnetic resonance hardware and software makes non-contrasted magnetic resonance angiography imaging technique develop rapidly, also non-contrasted magnetic resonance angiography imaging technique is made to become current study hotspot.
In blood vessel, the flowing of blood makes the spin be stimulated in blood fall apart picture sooner, and the signal intensity of blood in blood vessel is created a difference with the signal intensity of surrounding static tissue, and this characteristic makes the imaging of non-contrasted magnetic resonance angiography become possibility.
At present, the image that is all suppressed by Photographic Subtraction arteries that only arteries is suppressed and vein blood vessel of non-contrasted magnetic resonance intravenous angiography imaging and realizing.In numerous suppression blood vessel blood signal method in, existing researcher uses motion sensitive to cause balance (MSDE, motion-sensitized driven equilibrium) method or suppresses dynamic (quiet) arteries and veins blood flow to realize intravenous angiography imaging in the mode of blood flow inflow direction interpolation saturated zone.It is comparatively responsive to the flowing velocity of blood that motion sensitive causes balance (MSDE) method, when blood flow rate is slower, is difficult to the signal suppressing blood completely, and this makes the method well can not suppress the signal of venous blood flow; And the method for adding saturated zone is very high to the balance requirement between blood flow rate and thickness, it is caused to be difficult to obtain the black blood image of high-quality multilamellar in three-dimensional imaging; Therefore, utilize the method to carry out inhibition to the signal of blood in vein blood vessel not good, cause subtracting the feature that movie queen's gained image well can not give prominence to vein blood vessel.
Summary of the invention
The object of the invention is to provide a kind of non-contrasted Magnetic resonance venogram method, can be good at by the method the feature highlighting vein blood vessel, suppresses static tissue and arterial vascular feature simultaneously.
For reaching above-mentioned purpose, the present invention specifically provides a kind of non-contrasted magnetic resonance phlebography formation method, described formation method comprises: by the particular excitation (DANTE postponed alternately in conjunction with nutating, delay alternating withnutation for tailored excitation) module and balance steady-state free precession sequence (bSSFP, balancedsteady-state free precession), image is gathered, the image that acquisition arteries and vein blood vessel are all suppressed; By causing balance module and balance steady-state free precession (bSSFP) sequence in conjunction with motion sensitive, image is gathered, obtains the image that arteries is suppressed; The image that the Photographic Subtraction arteries be suppressed by the arteries of acquisition and vein blood vessel are all suppressed, obtains vein blood vessel image.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, also comprise between particular excitation (DANTE) module that described nutating postpones alternately and balance steady-state free precession (bSSFP) sequence: after particular excitation (DANTE) module that nutating postpones alternately, add damage gradient, carrying out faling apart to the Mxy in signal pattern processes mutually; Balance steady-state free precession (bSSFP) the sequence pair signal pattern after process mutually that falls apart is adopted to read.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, also comprise between described damage gradient and balance steady-state free precession (bSSFP) sequence: after damage gradient, add fat suppression method, suppress the signal of fat further; Signal pattern after adopting balance steady-state free precession (bSSFP) sequence pair to curb fat signal reads.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, described motion sensitive causes between balance (MSDE) module and balance steady-state free precession (bSSFP) sequence and also comprises: after motion sensitive causes balance (MSDE) module, add damage gradient, carrying out faling apart to the Mxy in signal pattern processes mutually; Balance steady-state free precession (bSSFP) the sequence pair signal pattern after process mutually that falls apart is adopted to read.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, also comprise between described damage gradient and balance steady-state free precession (bSSFP) sequence: after the process of damage gradient, add fat suppression module, suppress the signal of fat further; The image adopting balance steady-state free precession (bSSFP) sequence pair to curb fat signal and arteries signal reads.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, the image that the described Photographic Subtraction arteries that is suppressed by the arteries of acquisition and vein blood vessel are all suppressed comprises: the image that the image be suppressed the arteries of acquisition and described arteries and vein blood vessel are all suppressed directly carries out subtracting shadow, subtracting in shadow process, the static tissue characteristic sum arteries feature that two width images comprise jointly is eliminated, and only leaves vein blood vessel.
Advantageous Effects of the present invention is: obvious by the feature subtracting the image medium-sized vein blood vessel that shadow obtains, and can obtain high-quality magnetic resonance vein image; Not high to the balance requirement between blood flow rate and thickness, high-quality vein image can be obtained more easily in three-dimensional imaging.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is non-contrasted magnetic resonance phlebography formation method flow chart provided by the present invention;
Fig. 2 is particular excitation (DANTE) the sequence of modules figure that nutating postpones alternately;
Fig. 3 is particular excitation (DANTE) module that postpones alternately of nutating and balance steady-state free precession (bSSFP) scanning sequence figure;
Fig. 4 is that motion sensitive causes balance (MSDE) sequence of modules figure;
Fig. 5 is that motion sensitive causes balance (MSDE) module and balance steady-state free precession (bSSFP) scanning sequence figure;
Fig. 6 is that motion sensitive causes balance (MSDE) scanogram and subtracts particular excitation (DANTE) the scanogram schematic diagram that shadow nutating postpones alternately;
Fig. 7 A is the leg longitudinal surface vein blood vessel image that method provided by the present invention obtains;
Fig. 7 B is the leg longitudinal surface vein blood vessel image that motion sensitive causes the acquisition of balance (MSDE) method;
The transverse direction suppression arteries image that Fig. 7 C obtains for utilizing motion sensitive to cause balance (MSDE) method;
Fig. 7 D is that the transverse direction that particular excitation (DANTE) method utilizing nutating to postpone alternately obtains suppresses arteries and vein blood vessel image;
Transverse direction suppression arteries and the vein blood vessel image of Fig. 7 E for utilizing motion sensitive to cause the acquisition of balance (MSDE) method.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, schematic description and description of the present invention is for explaining the present invention, but not as a limitation of the invention.
Please refer to shown in Fig. 1, the present invention specifically provides a kind of non-contrasted magnetic resonance phlebography formation method, described formation method comprises: S101 is by particular excitation (DANTE) module that postpones alternately in conjunction with nutating and balance steady-state free precession (bSSFP) sequence, image is gathered, the image that acquisition arteries and vein blood vessel are all suppressed; S102, by causing balance (MSDE) module and balance steady-state free precession (bSSFP) sequence in conjunction with motion sensitive, gathers image, obtains the image that arteries is suppressed; The Photographic Subtraction arteries that the arteries of acquisition is suppressed by S103 and the image that vein blood vessel is all suppressed, obtain vein blood vessel image.This vein blood vessel image is the image that static tissue and arteries are all suppressed, therefore comparatively prior art, more accurately clear.
The position scanned in the application is static, and therefore, under normal conditions, the feature position in two images comprised in the two width images obtained by distinct methods is identical, just there will not be space after subtracting shadow.There is the situation of deviation if there is the feature in two width images in position, can be processed by the method for image registration, at this, no longer describe in detail.
In conjunction with the particular excitation module (DANTE that nutating postpones alternately in above-mentioned steps S101, delay alternatingwith nutation for tailored excitation) be a kind of method suppressing fluid flow blood signal in blood vessel, its have effective to blood signal suppression in blood vessel, to the advantage such as blood flow rate is insensitive, but it optionally can not suppress the signal of arteries or vein blood vessel.Particular excitation (DANTE) method that nutating postpones alternately is by applying a series of nonselective small-angle radio frequency pulse, between each radio-frequency pulse, intert that direction is identical, the gradient pulse of area equation simultaneously, the spin in static tissue and blood can be made to have phase place recruitment along gradient direction, and the sequential structure of the method is illustrated in fig. 2 shown below.
Please refer to shown in Fig. 2, for the spin in static tissue, the intensity in magnetic field residing for Arbitrary Spin is constant in the gradient fields of constant amplitude, and therefore, the phase place spinned in static tissue is linear along the change of gradient direction, has linear dependence; For arteries and vein blood vessel, because the blood in blood vessel has mobility, therefore, not in the same time, the intensity in magnetic field residing for same spin in blood is change, thus cause the phase place that spins in blood to be nonlinear along the change of gradient direction, not there is linear dependence, and it is relevant with the flowing velocity of blood along the phase place recruitment of gradient direction to spin in blood.If assuming that velocity of blood flow is a constant v, when time t, the position residing for spin meets X (t)=X 0+ vt, then the phase place recruitment spinned between (n-1) and the n-th radio-frequency pulse meets following formula:
Δθ ( n ) = γ ∫ ( n - 1 ) t D nt D G ( t ′ ) X ( t ′ ) d t ′ = γ ( X 0 + 1 2 v ) Gt D + nγvG t D 2 ;
Wherein, △ θ (n) be the phase place of spin in the recruitment between (n-1) and the n-th radio-frequency pulse, G is the amplitude of gradient pulse, and γ is gyromagnetic ratio, t dfor the interval time of continuous two radio-frequency pulses.According to this principle, the signal suppressing of blood in arteries and vein blood vessel can be fallen by particular excitation (DANTE) method that nutating postpones alternately, retains the signal of surrounding static tissue simultaneously.
In above-mentioned steps S102, motion sensitive causes balance (MSDE, motion-sensitized driven equilibrium) module can be used for suppressing blood flow signal in blood vessel equally, the method is by nonselective 90 °, 180 ° and 90 ° of radio-frequency pulses successively applying respectively in X-axis positive direction, Y-axis positive direction and X-axis negative direction, and the motion sensitive gradient (MSGs applied between each radio-frequency pulse, motion sensitization gradients) composition, the structure of this sequence is illustrated in fig. 4 shown below.
Due to the mobility of blood in arteries and vein blood vessel, the different moment that is certainly spun in blood is among different magnetic field intensity, thus cause the phase place that spins in blood to create a difference with the phase place of blood vessel surrounding static tissue, at non-selective 90 °, under the continuous action of 180 ° and 90 ° radio-frequency pulses, being certainly spun in static tissue is returned poly-completely after motion sensitive causes balance (MSDE) method, and the spin in blood is still in dephasing state, therefore, when reading signal, the signal of static tissue is better than the signal of blood in arteries and vein blood vessel, thus reach the effect suppressing blood flow signal in blood vessel.But, it is comparatively responsive to the flowing velocity of blood that motion sensitive causes balance (MSDE), in practical situations both, in vein blood vessel, the speed of blood flow is much slower than the flowing velocity of blood in arteries, make the loose picture effect that spins in vein blood vessel obvious not, thus it is obvious not to the inhibition of the signal of blood in vein blood vessel to cause motion sensitive to cause balance (MSDE) method, shows as the high signal of vein blood vessel in the picture.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, also comprise between particular excitation (DANTE) method that described nutating postpones alternately and balance steady-state free precession (bSSFP) sequence: after particular excitation (DANTE) method that nutating postpones alternately, add damage gradient, carry out faling apart to the Mxy in signal pattern and process mutually, namely loose phase is carried out to unwanted Mxy, leave the Mz of needs; Balance steady-state free precession (bSSFP) the sequence pair signal pattern after process mutually that falls apart is adopted to read.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, also comprise between the process of described damage gradient and balance steady-state free precession (bSSFP) sequence: after damage gradient, add fat suppression module, suppress the signal of fat further; Signal pattern after adopting balance steady-state free precession (bSSFP) sequence pair to curb fat signal reads.
After particular excitation (DANTE) method that nutating postpones alternately, add damage gradient and fat suppression method, the signal of arteries, vein blood vessel and fat can be curbed completely.Subsequently, adopt balance steady-state free precession (bSSFP) sequence pair signal to read, the sequential structure of this process is illustrated in fig. 3 shown below.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, described motion sensitive causes between balance (MSDE) module and balance steady-state free precession (bSSFP) sequence and also comprises: after motion sensitive causes balance (MSDE) method, add damage gradient, carry out faling apart to the Mxy in signal pattern and process mutually, namely loose phase is carried out to unwanted Mxy, leave the Mz of needs; Balance steady-state free precession (bSSFP) the sequence pair signal pattern after process mutually that falls apart is adopted to read.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, also comprise between described damage gradient and balance steady-state free precession (bSSFP) sequence: after the process of damage gradient, add fat suppression module, suppress the signal of fat further; Signal pattern after adopting balance steady-state free precession (bSSFP) sequence pair to curb fat signal reads.Equally, after motion sensitive causes balance (MSDE) method, add damage gradient and fat suppression suppression module, the signal of arteries and fat can be suppressed completely, remain the signal of surrounding static tissue and vein blood vessel simultaneously.The sequential structure of this process is illustrated in fig. 5 shown below.
In above-mentioned non-contrasted magnetic resonance phlebography formation method, the image that the described Photographic Subtraction arteries that is suppressed by the arteries of acquisition and vein blood vessel are all suppressed comprises: the image that the image be suppressed the arteries of acquisition and described arteries and vein blood vessel are all suppressed directly carries out subtracting shadow, subtracting in shadow process, the static tissue characteristic sum arteries feature that two width images comprise jointly is eliminated, and only leaves vein blood vessel.
In the above-described embodiments, it is that arteries and vein blood vessel are all suppressed that the particular excitation (DANTE) that nutating postpones alternately and balance steady-state free precession (bSSFP) scan gained image, and retain the image of static tissue, motion sensitive causes balance (MSDE) and balance steady-state free precession (bSSFP), and to scan gained image be that arteries is suppressed, but retain the image of vein blood vessel and static tissue, motion sensitive is caused balance (MSDE) to scan the particular excitation (DANTE) that the nutating of gained Photographic Subtraction postpones alternately and scan gained image, just arteries can be obtained and static tissue is suppressed, and vein blood vessel obtains the image of reservation, the schematic diagram of this process is illustrated in fig. 6 shown below.
The present invention to having carried out preliminary identification, confirms feasibility of the present invention (shown in following Fig. 7 A to Fig. 7 E) on 3T magnetic resonance system (MAGNETOM Trio, Siemens, Germany).Only cause by motion sensitive the method that balance (MSDE) suppresses artery and vein vascular signal compared to original, the method that the present invention proposes can obtain better picture quality.
Wherein, Fig. 7 A is that the present invention is to leg scanning result longitudinally, Fig. 7 B only causes by motion sensitive the contrast images that balance (MSDE) scanning subtracts shadow gained, can see from Fig. 7 A and Fig. 7 B, gained image medium-sized vein feature of the present invention is obviously better than only causing balance (MSDE) scanning by motion sensitive and subtracts shadow gained image (as shown by arrows).Fig. 7 C, Fig. 7 D and Fig. 7 E is respectively and utilizes motion sensitive to cause balance (MSDE) method suppression arteries, particular excitation (DANTE) method that nutating postpones alternately suppresses arteries and vein blood vessel and motion sensitive to cause the leg cross section image of balance (MSDE) method suppression arteries and vein blood vessel gained, as we can see from the figure, balance (MSDE) method is caused relative to motion sensitive, the vein blood vessel signal (as shown by arrows) that particular excitation (DANTE) method that nutating postpones alternately better inhibits blood flow rate slower, therefore, this experimental result also demonstrates the present invention and utilizes motion sensitive to cause balance (MSDE) scanning to subtract particular excitation (DANTE) scanning that shadow and nutating postpone alternately and subtract shadow gained vein blood vessel image and be better than only causing balance (MSDE) by motion sensitive and scan the image subtracting shadow gained.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a non-contrasted magnetic resonance phlebography formation method, is characterized in that, described formation method comprises:
By the particular excitation module that postpones alternately in conjunction with nutating and balance steady-state free precession sequence, image is gathered, obtain the image that arteries and vein blood vessel are all suppressed;
By causing balance module and balance steady-state free precession sequence in conjunction with motion sensitive, image is gathered, obtains the image that arteries is suppressed;
The image that the Photographic Subtraction arteries be suppressed by the arteries of acquisition and vein blood vessel are all suppressed, obtains vein blood vessel image.
2. non-contrasted magnetic resonance phlebography formation method according to claim 1, is characterized in that, also comprises between the particular excitation method that described nutating postpones alternately and balance steady-state free precession sequence:
After the particular excitation module that nutating postpones alternately, add damage gradient, carrying out faling apart to the Mxy in signal pattern processes mutually;
The balance steady-state free precession sequence pair signal pattern after process mutually that falls apart is adopted to read.
3. non-contrasted magnetic resonance phlebography formation method according to claim 2, it is characterized in that, also comprise between described damage gradient and balance steady-state free precession sequence: after damage gradient, add fat suppression module, suppress the signal from fat further;
Signal pattern after adopting balance steady-state free precession sequence pair to curb fat signal reads.
4. non-contrasted magnetic resonance phlebography formation method according to claim 1, is characterized in that, described motion sensitive causes between balance module and balance steady-state free precession sequence and also comprises:
After motion sensitive causes balance module, add damage gradient, carrying out faling apart to the Mxy in signal pattern processes mutually;
The balance steady-state free precession sequence pair signal pattern after process mutually that falls apart is adopted to read.
5. non-contrasted magnetic resonance phlebography formation method according to claim 4, it is characterized in that, also comprise between described damage gradient and balance steady-state free precession sequence: after damage gradient, add fat suppression module, suppress the signal from fat further;
Signal pattern after adopting balance steady-state free precession sequence pair to curb fat signal reads.
6. non-contrasted magnetic resonance phlebography formation method according to claim 1, it is characterized in that, the image that the described Photographic Subtraction arteries that is suppressed by the arteries of acquisition and vein blood vessel are all suppressed comprises: the image that the image be suppressed the arteries of acquisition and described arteries and vein blood vessel are all suppressed directly carries out subtracting shadow, subtracting in shadow process, the static tissue characteristic sum arteries feature that two width images comprise jointly is eliminated, and retains vein blood vessel image.
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CN109934888A (en) * 2019-04-24 2019-06-25 清华大学 The magnetic resonance dynamic vascular imaging method and system of non-contrast medium enhancing

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CN103110420A (en) * 2013-01-31 2013-05-22 深圳先进技术研究院 Magnetic resonance angiography method and magnetic resonance angiography system
US20130314086A1 (en) * 2012-03-20 2013-11-28 Isis Innovation Ltd. Motion sensitized and motion suppressed imaging using dante prepared pulse trains

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US20130314086A1 (en) * 2012-03-20 2013-11-28 Isis Innovation Ltd. Motion sensitized and motion suppressed imaging using dante prepared pulse trains
CN103110420A (en) * 2013-01-31 2013-05-22 深圳先进技术研究院 Magnetic resonance angiography method and magnetic resonance angiography system

Cited By (2)

* Cited by examiner, † Cited by third party
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CN108567422A (en) * 2018-03-02 2018-09-25 上海东软医疗科技有限公司 A kind of blood vessel imaging method and apparatus
CN109934888A (en) * 2019-04-24 2019-06-25 清华大学 The magnetic resonance dynamic vascular imaging method and system of non-contrast medium enhancing

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