CN106952261B - A kind of image processing method and device inhibiting fat signal - Google Patents
A kind of image processing method and device inhibiting fat signal Download PDFInfo
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Abstract
The invention discloses a kind of image processing methods and device for inhibiting fat signal, which comprises the progress Fourier transform of collected free induction decay signal is obtained the frequency spectrum that Hydrogen Proton resonant frequency is distributed in water and fat by magnetic resonance system；Magnetic resonance system is analyzed to obtain the resonant frequency distribution situation of practical fat Hydrogen Proton and matches fat saturation pulse according to Hydrogen Proton resonant frequency spread spectrum in water and fat；The fat saturation pulse that magnetic resonance system is obtained using matching carries out fatty saturation and generates the fat suppression image of magnetic resonance to inhibit the generation of fat signal.The present invention applies the fat saturation pulse of different bandwidth and centre frequency according to the resonant frequency distribution situation of practical fatty Hydrogen Proton, the inhibition of fat signal is carried out by fat saturation pulse, the success rate of fat suppression is improved, to obtain the apparent magnetic resonance image of fat suppression effect.
Description
Technical field
The present invention relates to technical field of image processing, and in particular to a kind of image processing method and dress for inhibiting fat signal
It sets.
Background technique
In magnetic resonance, the Hydrogen Proton in fat and water is because of chemical shift (proton core due to caused by chemical environment
The variation of magnetic resonance signal position) the reason of with different resonant frequencies.For preferably lesions showed in some sequences,
The signal fat is needed to curb, then just needing first to apply a narrow-band impulse for Hydrogen Proton resonant frequency in fat
Hydrogen Proton saturation in fat is fallen.Then it reuses wideband pulse to go normally to excite tissue, at this time because of the hydrogen matter in fat
Son is saturated, then will not generate signal, and the image at this moment generated is exactly the fat suppression image of magnetic resonance.
The prior art is the Hydrogen Proton in the pulse desaturation fat using fixed bandwidth and centre frequency, which makes
Premise is exactly that the fatty Hydrogen Proton resonant frequency that the resonant frequency of Hydrogen Proton goes out with theoretical calculation in practical fat is consistent
's.But the resonant frequency of practical fatty Hydrogen Proton is not only influenced by chemical shift, but also by local susceptibility, people
The influence of many factors such as body geometry, so the resonant frequency of Hydrogen Proton and the counted hydrogen out of theoretical meter in practical fat
The resonant frequency of proton has different.If the pulse for being used to saturated fat Hydrogen Proton is come out according to theoretical calculation
Bandwidth and centre frequency will generate biggish difference, necessarily have some or all of fat that can not be saturated come what is applied.In
Some shimmings are relatively easy to human body, and fat suppression effect is relatively good；And the position more difficult in shimming, as partial center compared with
The remote or biggish tissue of susceptibility difference, fat suppression effect is with regard to poor, then can not just show that fat suppression effect is bright
Aobvious magnetic resonance image.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of inhibition fat letter
Number image processing method and device, it is intended to different bands is applied according to the resonant frequency distribution situation of practical fatty Hydrogen Proton
Wide and centre frequency fat saturation pulse, the inhibition of fat signal is carried out by fat saturation pulse, to obtain fatty suppression
The apparent magnetic resonance image of effect processed.
The technical proposal for solving the technical problem of the invention is as follows:
A kind of image processing method inhibiting fat signal, wherein the following steps are included:
Step A, the progress Fourier transform of collected free induction decay signal is obtained water and fat by magnetic resonance system
The frequency spectrum of middle Hydrogen Proton resonant frequency distribution；
Step B, magnetic resonance system is analyzed to obtain practical fat according to Hydrogen Proton resonant frequency spread spectrum in water and fat
The resonant frequency distribution situation of Hydrogen Proton simultaneously matches fat saturation pulse；
Step C, magnetic resonance system carries out fatty saturation using the fat saturation pulse that matching obtains, to inhibit fatty letter
Number generation, generate the fat suppression image of magnetic resonance.
The image processing method of the inhibition fat signal, wherein the step A is specifically included:
Step A1, magnetic resonance system advances with shim coil and carries out 3D automatic shimming；
Step A2, magnetic resonance system collects free induction decay signal and carries out Fourier after 3D automatic shimming
Transformation obtains the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat.
The image processing method of the inhibition fat signal, wherein the step B is specifically included:
Step B1, magnetic resonance system obtains practical rouge according to the spectrum analysis that Hydrogen Proton resonant frequency in water and fat is distributed
The resonant frequency distribution situation of fat Hydrogen Proton；
Step B2, magnetic resonance system is analyzed according to the resonant frequency distribution situation of practical fatty Hydrogen Proton and is actually needed
Fat saturation pulse bandwidth and centre frequency；
Step B3, the bandwidth and centre frequency of the fat saturation pulse of magnetic resonance system according to actual needs, Auto-matching
Out closest to the fat saturation pulse of practical fatty Hydrogen Proton resonant frequency bandwidth.
The image processing method of the inhibition fat signal, wherein before the step B further include: total in magnetic in advance
In vibrating system be arranged 21 different bandwidths fat saturation pulse and storage, and the bandwidth range of the fat saturation pulse from
250 hertz to 450 hertz, 10 hertz are differed between each fat saturation pulse；The step B3 is specific further include: step B31,
Magnetic resonance system matches and fat saturation pulse actually required from the fat saturation pulse of 21 different bandwidths
Bandwidth and the immediate fat saturation pulse of centre frequency.
The image processing method of the inhibition fat signal, wherein the step C is specifically included:
Step C1, the Hydrogen Proton in fat is saturated by magnetic resonance system using the fat saturation pulse that matching obtains；
Step C2, after magnetic resonance system completes fat signal process of inhibition, the fat suppression image of magnetic resonance is generated.
The image processing method of the inhibition fat signal, wherein Hydrogen Proton resonant frequency point in the water and fat
The frequency spectrum of cloth includes: the fatty peak of the Hydrogen Proton formation of the water peak that the Hydrogen Proton of water is formed and fat；The water peak and fatty peak
Distributed image using resonant frequency as X-axis；The frequency spectrum of Hydrogen Proton resonant frequency distribution in the water and fat further include: in institute
The two sides baseline position for stating fatty peak places two mark lines respectively, and the distance between two mark lines are the fatty peak
Bandwidth, the frequency at center is the centre frequency at the fatty peak between two mark lines.
A kind of image processing apparatus inhibiting fat signal, wherein described device includes:
Collected free induction decay signal is carried out Fourier change for controlling magnetic resonance system by signal acquisition module
Get the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat in return；
Pulse matching module, for controlling magnetic resonance system according to Hydrogen Proton resonant frequency spread spectrum point in water and fat
Analysis obtains the resonant frequency distribution situation of practical fat Hydrogen Proton and matches fat saturation pulse；
Image generation module, it is full for controlling the fat saturation pulse progress fat that magnetic resonance system is obtained using matching
With to inhibit the generation of fat signal, generate the fat suppression image of magnetic resonance.
The image processing apparatus of the inhibition fat signal, wherein the signal acquisition module specifically includes:
Automatic shimming unit advances with shim coil progress 3D automatic shimming for controlling magnetic resonance system；
Signal acquisition and converter unit collect free induction for controlling magnetic resonance system after 3D automatic shimming
Deamplification and carry out Fourier transform obtain water and fat in Hydrogen Proton resonant frequency distribution frequency spectrum.
The image processing apparatus of the inhibition fat signal, wherein the pulse matching module specifically includes:
Spectral analysis unit, for controlling magnetic resonance system according to the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat
Analysis obtains the resonant frequency distribution situation of practical fat Hydrogen Proton；
Pulse processing unit, for controlling magnetic resonance system according to the resonant frequency distribution situation point of practical fatty Hydrogen Proton
Analysis obtains the bandwidth and centre frequency of fat saturation pulse actually required；
Automatic matching unit, for controlling bandwidth and the center of the fat saturation pulse of magnetic resonance system according to actual needs
Frequency, Auto-matching go out the fat saturation pulse closest to practical fatty Hydrogen Proton resonant frequency bandwidth.
The image processing apparatus of the inhibition fat signal, wherein described image generation module specifically includes:
Hydrogen Proton saturation unit, for controlling magnetic resonance system using the obtained fat saturation pulse of matching for the hydrogen in fat
Proton is saturated；
Signal inhibits and image generation unit, raw for controlling after magnetic resonance system completes fat signal process of inhibition
At the fat suppression image of magnetic resonance.
Beneficial effects of the present invention: a kind of image processing method and device inhibiting fat signal provided by the invention, institute
The method of stating, which includes: magnetic resonance system, obtains hydrogen in water and fat for the progress Fourier transform of collected free induction decay signal
The frequency spectrum of Proton Resonance Frequency distribution；Magnetic resonance system is analyzed to obtain according to Hydrogen Proton resonant frequency spread spectrum in water and fat
The resonant frequency distribution situation of practical fat Hydrogen Proton simultaneously matches fat saturation pulse；Magnetic resonance system is obtained using matching
Fat saturation pulse carries out fatty saturation and generates the fat suppression image of magnetic resonance to inhibit the generation of fat signal.This hair
The bright fat saturation arteries and veins for applying different bandwidth and centre frequency according to the resonant frequency distribution situation of practical fatty Hydrogen Proton
Punching carries out the inhibition of fat signal by fat saturation pulse, to obtain the apparent magnetic resonance image of fat suppression effect.
Detailed description of the invention
Fig. 1 is the flow chart of the preferred embodiment for the image processing method that the present invention inhibits fat signal.
Fig. 2 is that Hydrogen Proton resonant frequency is distributed in the water and fat for the image processing method that the present invention inhibits fat signal
Spectrogram.
Fig. 3 is the magnetic resonance image effect that the present invention inhibits whether fat signal inhibits in the image processing method of fat signal
The comparison diagram of fruit.
Fig. 4 is the functional schematic block diagram of the preferred embodiment for the image processing apparatus that the present invention inhibits fat signal.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
Fig. 1 described in present pre-ferred embodiments is the preferable implementation for the image processing method that the present invention inhibits fat signal
Example flow chart, as shown in Figure 1, it is described inhibit fat signal image processing method the following steps are included:
Step S100, the progress Fourier transform of collected free induction decay signal is obtained water and rouge by magnetic resonance system
The frequency spectrum that Hydrogen Proton resonant frequency is distributed in fat.
Preferably, the step S100 the following steps are included:
Step S101, magnetic resonance system advances with shim coil and carries out 3D automatic shimming；
Step S102, magnetic resonance system collects free induction decay signal and carries out Fourier after 3D automatic shimming
Leaf transformation obtains the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat.
When it is implemented, due to requiring magnet system to be capable of providing the magnetostatic field of high uniformity in magnetic resonance imaging system,
This be also obtain high quality MRI(magnetic resonance imaging, magnetic resonance imaging) image basic guarantee.MRI
The principle of Fat-suppression technique and clinical application are in magnetic resonance imaging (MRI), due to Hydrogen Proton in adipose tissue and other
Molecule environment locating for Hydrogen Proton in tissue is different, so that their resonant frequency is not identical；When fat and other tissues
After Hydrogen Proton is motivated by radio-frequency pulse simultaneously, their relaxation time is also different.Signal is acquired in the different echo times,
Adipose tissue and non-fat tissue show different signal strengths.Using the above-mentioned characteristic of different tissues, then just needing
Inhibit the pulse of fat signal out.
To obtain a stable uniform field, the present invention uses active shimming coil, is produced by the electric current in control coil
The magnetic-field component of raw different directions is added in main field, realizes the real-time correction to magnetic field, and magnetic resonance system utilizes described even
Field coil realizes 3D automatic shimming.Magnetic resonance system collects FID(FREE INDUCTION after 3D automatic shimming
DECAY, free induction decay) signal and carry out Fourier transform obtain tissue Hydrogen Proton resonant frequency distribution frequency
Spectrum.
Fourier transform, indicating can be by some function representation met certain condition at trigonometric function (sinusoidal and/or cosine
Function) or they integral linear combination, in different research fields, Fourier transform has a variety of different variant shapes
Formula, such as continuous Fourier transform and Discrete Fourier Transform.Initial Fourier analysis is the work of the analytical analysis as thermal process
What tool was suggested.In physics, electrical type subject, number theory, Combinational Mathematics, signal processing, probability theory, statistics, cryptography, sound
The fields such as, optics, oceanography, Structural Dynamics, which suffer from, to be widely applied.
Fourier transform is a kind of method for analyzing signal, it can analyze the ingredient of signal, it is also possible to the synthesis of these ingredients
Signal.Many waveforms can be used as ingredient of signal, such as sine wave, square wave, sawtooth wave etc., Fourier transformation use sine wave as
The ingredient of signal.
Fourier transform formula are as follows:
Formula description: F (ω) is the transform of f (t) in formula, and f (t) is the picture original function of F (ω).
Preferably, the frequency spectrum that the Hydrogen Proton resonant frequency of the tissue is distributed includes that water is formed with Hydrogen Proton in fat
Water peak and fat Hydrogen Proton formed fatty peak.As shown in Fig. 2, Fig. 2 is the image procossing that the present invention inhibits fat signal
The spectrogram of Hydrogen Proton resonant frequency distribution in the water and fat of method.Left-side images are that the Hydrogen Proton of fat is formed in Fig. 2
Fatty peak, image right are the water peak that the Hydrogen Proton of water is formed.
Step S200, magnetic resonance system is analyzed to obtain practical rouge according to Hydrogen Proton resonant frequency spread spectrum in water and fat
The resonant frequency distribution situation of fat Hydrogen Proton simultaneously matches fat saturation pulse.
Preferably, the step S200 the following steps are included:
Step S201, magnetic resonance system obtains reality according to the spectrum analysis that Hydrogen Proton resonant frequency in water and fat is distributed
The resonant frequency distribution situation of fatty Hydrogen Proton；
Step S202, magnetic resonance system is analyzed to obtain practical need according to the resonant frequency distribution situation of practical fatty Hydrogen Proton
The bandwidth and centre frequency for the fat saturation pulse wanted；
Step S203, the bandwidth and centre frequency of the fat saturation pulse of magnetic resonance system according to actual needs, automatic
Allot the fat saturation pulse closest to practical fatty Hydrogen Proton resonant frequency bandwidth.
When it is implemented, the frequency spectrum that Hydrogen Proton resonant frequency is distributed in the water of magnetic resonance system according to Fig.2, and fat
Analysis obtain the resonant frequency distribution situation of practical fat Hydrogen Proton and obtain the bandwidth of fat saturation pulse actually required with
Centre frequency.For the ease of intuitively from Fig. 2 fatty Hydrogen Proton resonant frequency distribution, preferably, the water peak with
The distributed image at fatty peak is using resonant frequency as X-axis, therefore the frequency range of fatty Hydrogen Proton gem-pure can be shown
Out.Two sides baseline position in the present embodiment at the fatty peak places two mark lines respectively, and between two mark lines
Distance be the fatty peak bandwidth, the frequency at center is the centre frequency at the fatty peak between two mark lines.Therefore,
Magnetic resonance system can be easily obtained the bandwidth and centre frequency of fat saturation pulse actually required.
Preferably, before the step B further include: the fat that 21 different bandwidths are arranged in magnetic resonance system in advance is full
With pulse and store, and the bandwidth range of the fat saturation pulse is from 250 hertz to 450 hertz, each fat saturation pulse
Between differ 10 hertz.The bandwidth of i.e. pre-set fat saturation pulse be 250 ~ 260 hertz, 260 ~ 270 hertz, 270 ~
280 hertz, 280 ~ 290 hertz ... 440 ~ 450 hertz.
Further, the bandwidth and centre frequency Auto-matching of the fat saturation pulse of magnetic resonance system according to actual needs
Out closest to the fat saturation pulse of practical fatty Hydrogen Proton resonant frequency bandwidth.When it is implemented, magnetic resonance system is from described
It is matched in the fat saturation pulse of 21 different bandwidths with the bandwidth of fat saturation pulse actually required and centre frequency most
Close fat saturation pulse.For example, the bandwidth of fat saturation pulse actually required is 263 ~ 271 hertz, then magnetic resonance system
System Auto-matching and 263 ~ 271 hertz of immediate fat saturation pulses, i.e., 260 ~ 270 hertz of fat saturation pulse.
Step S300, magnetic resonance system carries out fatty saturation using the fat saturation pulse that matching obtains, to inhibit rouge
The generation of fat signal generates the fat suppression image of magnetic resonance.
Preferably, the step S300 is specifically included:
Step S301, the Hydrogen Proton in fat is saturated by magnetic resonance system using the fat saturation pulse that matching obtains；
Step S302, after magnetic resonance system completes fat signal process of inhibition, the fat suppression image of magnetic resonance is generated.
Specifically, the fat closest to practical fatty Hydrogen Proton resonant frequency bandwidth that magnetic resonance system is obtained using matching
Saturation pulse falls the Hydrogen Proton saturation in fat, such as described in above-mentioned example, magnetic resonance system is immediate using matching
260 ~ 270 hertz of fat saturation pulse inhibits fat signal, and fat proton is made not generate signal, to obtain only
Image containing water proton signals.
Based on the above embodiment, the present invention also provides inhibit fat signal image processing method in fat signal whether
The comparison diagram of the magnetic resonance image effect of inhibition.
As shown in Figure 3.A and B in Fig. 3 are the bandwidth gone out in the prior art according to theoretical calculation and centre frequency to apply
The fat signal suppression technology effect picture of fat saturation pulse, C and D are the resonance frequency of the invention according to practical fatty Hydrogen Proton
Rate distribution situation applies the fat signal suppression technology effect picture of the fat saturation pulse of different bandwidth and centre frequency.By
Fig. 3 can be seen that have large stretch of adipose tissue not fallen (white area in figure) by suppression in A and B, the present invention utilizes magnetic resonance system
The progress Fourier transform of collected free induction decay signal is obtained into the frequency of Hydrogen Proton resonant frequency distribution in water and fat
Spectrum；Magnetic resonance system is analyzed to obtain the resonance of practical fat Hydrogen Proton according to Hydrogen Proton resonant frequency spread spectrum in water and fat
Frequency distribution situation simultaneously matches fat saturation pulse；Magnetic resonance system carries out fat using the fat saturation pulse that matching obtains
Saturation, to inhibit the generation of fat signal, generates the fat suppression image of magnetic resonance, as fat suppression is imitated in C and D in Fig. 3
Fruit is obvious.
The present invention also provides a kind of image processing apparatus for inhibiting fat signal, as shown in figure 4, described device includes:
Collected free induction decay signal is carried out Fourier for controlling magnetic resonance system by signal acquisition module 410
Leaf transformation obtains the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat；As detailed above.
Pulse matching module 420, for controlling magnetic resonance system according to Hydrogen Proton resonant frequency distribution frequency in water and fat
Spectrum analysis obtains the resonant frequency distribution situation of practical fat Hydrogen Proton and matches fat saturation pulse；As detailed above.
Image generation module 430 carries out fat using the fat saturation pulse that matching obtains for controlling magnetic resonance system
Saturation, to inhibit the generation of fat signal, generates the fat suppression image of magnetic resonance；As detailed above.
The image processing apparatus of the inhibition fat signal, wherein the signal acquisition module specifically includes:
Automatic shimming unit advances with shim coil progress 3D automatic shimming for controlling magnetic resonance system；Specifically such as
It is upper described.
Signal acquisition and converter unit collect free induction for controlling magnetic resonance system after 3D automatic shimming
Deamplification and carry out Fourier transform obtain water and fat in Hydrogen Proton resonant frequency distribution frequency spectrum；As detailed above.
The image processing apparatus of the inhibition fat signal, wherein the pulse matching module specifically includes:
Spectral analysis unit, for controlling magnetic resonance system according to the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat
Analysis obtains the resonant frequency distribution situation of practical fat Hydrogen Proton；As detailed above.
Pulse processing unit, for controlling magnetic resonance system according to the resonant frequency distribution situation point of practical fatty Hydrogen Proton
Analysis obtains the bandwidth and centre frequency of fat saturation pulse actually required；As detailed above.
Automatic matching unit, for controlling bandwidth and the center of the fat saturation pulse of magnetic resonance system according to actual needs
Frequency, Auto-matching go out the fat saturation pulse closest to practical fatty Hydrogen Proton resonant frequency bandwidth；As detailed above.
The image processing apparatus of the inhibition fat signal, wherein described image generation module specifically includes:
Hydrogen Proton saturation unit, for controlling magnetic resonance system using the obtained fat saturation pulse of matching for the hydrogen in fat
Proton is saturated；
Signal inhibits and image generation unit, raw for controlling after magnetic resonance system completes fat signal process of inhibition
At the fat suppression image of magnetic resonance.
In conclusion the present invention provides a kind of image processing method and device for inhibiting fat signal, the method packet
Include: the progress Fourier transform of collected free induction decay signal is obtained Hydrogen Proton in water and fat and resonated by magnetic resonance system
The frequency spectrum of frequency distribution；Magnetic resonance system is analyzed to obtain practical fat according to Hydrogen Proton resonant frequency spread spectrum in water and fat
The resonant frequency distribution situation of Hydrogen Proton simultaneously matches fat saturation pulse；Magnetic resonance system is saturated using the fat that matching obtains
Pulse carries out fatty saturation and generates the fat suppression image of magnetic resonance to inhibit the generation of fat signal.The present invention is according to reality
The resonant frequency distribution situation of border fat Hydrogen Proton applies the fat saturation pulse of different bandwidth and centre frequency, passes through rouge
Fat saturation pulse carries out the inhibition of fat signal, to obtain the apparent magnetic resonance image of fat suppression effect.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (8)
1. a kind of image processing method for inhibiting fat signal, which comprises the following steps:
Step A, the progress Fourier transform of collected free induction decay signal is obtained hydrogen in water and fat by magnetic resonance system
The frequency spectrum of Proton Resonance Frequency distribution；
Step B, magnetic resonance system is analyzed to obtain practical fat hydrogen matter according to Hydrogen Proton resonant frequency spread spectrum in water and fat
The resonant frequency distribution situation of son simultaneously matches fat saturation pulse；
Step C, magnetic resonance system carries out fatty saturation using the fat saturation pulse that matching obtains, to inhibit fat signal
It generates, generates the fat suppression image of magnetic resonance；
The step B is specifically included:
Step B1, magnetic resonance system obtains practical fat hydrogen according to the spectrum analysis that Hydrogen Proton resonant frequency in water and fat is distributed
The resonant frequency distribution situation of proton；
Step B2, magnetic resonance system is analyzed to obtain rouge actually required according to the resonant frequency distribution situation of practical fatty Hydrogen Proton
The bandwidth and centre frequency of fat saturation pulse；
Step B3, the bandwidth and centre frequency of the fat saturation pulse of magnetic resonance system according to actual needs, Auto-matching go out most
Close to the fat saturation pulse of practical fatty Hydrogen Proton resonant frequency bandwidth.
2. the image processing method according to claim 1 for inhibiting fat signal, which is characterized in that the step A is specific
Include:
Step A1, magnetic resonance system advances with shim coil and carries out 3D automatic shimming；
Step A2, magnetic resonance system collects free induction decay signal and carries out Fourier transform after 3D automatic shimming
Obtain the frequency spectrum of Hydrogen Proton resonant frequency distribution in water and fat.
3. the image processing method according to claim 1 for inhibiting fat signal, which is characterized in that before the step B
Further include: the fat saturation pulse of 21 different bandwidths and storage, and the fat saturation are set in magnetic resonance system in advance
The bandwidth range of pulse differs 10 hertz from 250 hertz to 450 hertz between each fat saturation pulse；The step B3 tool
Body further include: step B31, magnetic resonance system is matched and is actually needed from the fat saturation pulse of 21 different bandwidths
Fat saturation pulse bandwidth and the immediate fat saturation pulse of centre frequency.
4. the image processing method according to claim 1 for inhibiting fat signal, which is characterized in that the step C is specific
Include:
Step C1, the Hydrogen Proton in fat is saturated by magnetic resonance system using the fat saturation pulse that matching obtains；
Step C2, after magnetic resonance system completes fat signal process of inhibition, the fat suppression image of magnetic resonance is generated.
5. the image processing method according to claim 1 for inhibiting fat signal, which is characterized in that in the water and fat
The frequency spectrum of Hydrogen Proton resonant frequency distribution includes: the fatty peak of the Hydrogen Proton formation of the water peak that the Hydrogen Proton of water is formed and fat；
The distributed image at the water peak and fatty peak is using resonant frequency as X-axis；Hydrogen Proton resonant frequency distribution in the water and fat
Frequency spectrum further include: the two sides baseline position at the fatty peak places two mark lines respectively, and between two mark lines
Distance is the bandwidth at the fatty peak, and the frequency at center is the centre frequency at the fatty peak between two mark lines.
6. a kind of image processing apparatus for inhibiting fat signal, which is characterized in that described device includes:
Signal acquisition module obtains the progress Fourier transform of collected free induction decay signal for controlling magnetic resonance system
The frequency spectrum of Hydrogen Proton resonant frequency distribution into water and fat；
Pulse matching module is analyzed for controlling magnetic resonance system according to Hydrogen Proton resonant frequency spread spectrum in water and fat
To the actually resonant frequency distribution situation of fatty Hydrogen Proton and match fat saturation pulse；
Image generation module carries out fatty saturation using the fat saturation pulse that matching obtains for controlling magnetic resonance system, from
And inhibit the generation of fat signal, generate the fat suppression image of magnetic resonance；
The pulse matching module specifically includes:
Spectral analysis unit, for controlling magnetic resonance system according to the spectrum analysis of Hydrogen Proton resonant frequency distribution in water and fat
Obtain the resonant frequency distribution situation of practical fat Hydrogen Proton；
Pulse processing unit is analyzed for controlling magnetic resonance system according to the resonant frequency distribution situation of practical fatty Hydrogen Proton
To the bandwidth and centre frequency of fat saturation pulse actually required；
Automatic matching unit, for controlling the bandwidth and center frequency of the fat saturation pulse of magnetic resonance system according to actual needs
Rate, Auto-matching go out the fat saturation pulse closest to practical fatty Hydrogen Proton resonant frequency bandwidth.
7. the image processing apparatus according to claim 6 for inhibiting fat signal, which is characterized in that the signal acquisition mould
Block specifically includes:
Automatic shimming unit advances with shim coil progress 3D automatic shimming for controlling magnetic resonance system；
Signal acquisition and converter unit collect free induction decay for controlling magnetic resonance system after 3D automatic shimming
Signal and carry out Fourier transform obtain water and fat in Hydrogen Proton resonant frequency distribution frequency spectrum.
8. the image processing apparatus according to claim 6 for inhibiting fat signal, which is characterized in that described image generates mould
Block specifically includes:
Hydrogen Proton saturation unit, for controlling magnetic resonance system using the obtained fat saturation pulse of matching for the Hydrogen Proton in fat
It is saturated；
Signal inhibits and image generation unit, for controlling after magnetic resonance system completes fat signal process of inhibition, generates magnetic
The fat suppression image of resonance.
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| EP3432020A1 (en) * | 2017-07-18 | 2019-01-23 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for fat suppression in magnetic resonance imaging |
| US10955506B2 (en) * | 2018-03-09 | 2021-03-23 | Koninklijke Philips N.V. | Parallel MR imaging with spectral fat suppression |
| CN111460934B (en) * | 2020-03-18 | 2023-09-29 | 深圳市贝斯达医疗股份有限公司 | Center frequency calculation method and system for superconducting high-field magnetic resonance |
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