Blood flow artifact removing method for carotid magnetic resonance blood vessel wall imaging

Abstract

The invention discloses a blood flow artifact removing method for carotid magnetic resonance blood vessel wall imaging. The method comprises steps of firstly, black blood and gray blood images are obtained by using the black-gray blood double contrast imaging technique, and then the images are pretreated based on the two-dimensional discrete wavelet transform to suppress the high frequency subband; different pre-emphases are adopted to process the black blood and gray blood images, and the black blood image after the pre-emphasis is subtracted from the black blood image after the pre-emphasis, so as to obtain a subtracted image; and the brightness of the subtracted image is adjusted so that the average brightness of the subtracted image is equal to the average brightness of the initial black blood image, and the blood vessel wall magnetic resonance image of which the blood flow artifact is removed is obtained. The method can reduce the signal-to-noise ratio of the lumen, improve the wall-to-cavity differential noise ratio, and more completely remove the blood flow artifacts in the original black blood imaging.

Description

technical field [0001] The invention relates to magnetic resonance vessel wall imaging technology, in particular to a blood flow artifact removal method for carotid artery magnetic resonance vessel wall imaging, and belongs to the field of medical imaging. Background technique [0002] Cardiovascular and cerebrovascular diseases have become the primary diseases that threaten human health. Black-blood magnetic resonance imaging, also known as magnetic resonance vessel wall imaging, is a commonly used technique for diagnosing vascular diseases. It can image the stenosis and occlusion of blood vessels. It suppresses the blood signal through a black blood pre-pulse, so the blood appears dark in the resulting image. Black blood imaging technology can clearly display plaque tissue in the vascular lumen, and high-resolution black blood imaging can distinguish plaque components, so it plays a positive role in assessing plaque stability and risk prediction. An efficient technique f...

AI Technical Summary

Problems solved by technology

[0004] However, due to the unique structure of the carotid artery, the flow pattern of the blood flow is complicated, and sometimes there will be blood flow that is too slow, stopped, and reversed at the bifurcation of the carotid artery, resulting in blood flow artifacts, which are difficult to isolate Relying on blood flow inhibitory prepulse to remove

Residual blood flow artifacts will interfere with the imaging results of vessel lumen, vessel wall and plaque, making the boundary between vessel wall and plaque blurred and difficult to distinguish

This will cause the thickness of the blood vessel wall measured from the image to be thicker, and it will also affect the identification of plaques, thereby affecting the clinical diagnosis

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