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Correcting method and device of background phase

A technology of background phase and correction method, which is applied in the field of correction of the background phase of phase contrast MRA, can solve the problems of complex operation, influence of phase offset, and time-consuming, etc., achieve good robustness, realize correction, and facilitate operation Effect

Active Publication Date: 2013-07-31
SIEMENS SHENZHEN MAGNETIC RESONANCE
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Problems solved by technology

However, since the slice orientation affects the phase offset, this sampling must be repeated for different situations, which makes the sampling take a lot of time, and the amount of sampled data is large and the operation is more complicated
Therefore, this solution is not convenient to apply in clinical practice

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  • Correcting method and device of background phase
  • Correcting method and device of background phase
  • Correcting method and device of background phase

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Embodiment Construction

[0029] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] Facing the existing technical difficulties, the inventors of the present application did not stick to the original idea of ​​finding static tissue near the measured tissue or simulating static tissue, but proposed an innovative correction method of background phase. Methods Based on the assumption that the background offset appears as a stable spatial change, the kernel clustering algorithm (Kernel Clustering Algorithm) was used to select static pixels corresponding to static tissue in the image. In this way, there is no need to sample a separate static phantom, which facilitates clinical operation...

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Abstract

The present invention discloses a correcting method and device of background phase; the method comprises the steps of: after obtaining a phase image of a speed code, selecting a static pixel point corresponding to a static organization in the phase image; performing plane fitting according to the selected static pixel to obtain a plane reflecting a background phase offset error of the static pixel; subtracting the phase image with the plane obtained by the fitting, so as to obtain a phase image corrected by the background phase. By the method of the present invention, the static pixel corresponding to the static organization in the image is selected by kernel clustering algorithm; the robustness of the kernel clustering algorithm is quite good, so that the static pixel can be selected stably, and the correction to the background phase is realized; simultaneously, by the method of the present invention, sampling to a single static body model is not needed, and operations during clinical use are greatly convenient.

Description

technical field [0001] The present invention relates to magnetic resonance angiography (magnetic resonance angiography, MRA) technology, in particular to a method and device for correcting the background phase of phase contrast MRA. Background technique [0002] In the application of magnetic resonance cine (MR CINE) phase-contrast velocity quantification, the velocity-encoded phase image can be distorted by uncompensated eddy-current-induced fields, resulting in phase-shift errors, which in turn are identified as abnormalities in static tissue. zero speed. Since volume flow estimates in the great vessels are determined by temporal and spatial integration, small velocity excursions can also cause significant errors in the results of mean volume flow, stroke volume, and cardiac output. Most scanners are designed to compensate for eddy current induced fields, but with the recent advent of high power gradient systems, the problem of phase offset errors has reemerged. [0003]...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055
Inventor 贾迪野
Owner SIEMENS SHENZHEN MAGNETIC RESONANCE