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New Carotid Artery Stenosis Measurement Method Using MRA Images  

김도연 (한국전력기술㈜ 원자로설계개발단)
박종원 (충남대학교 정보통신공학과)
Publication Information
Journal of KIISE:Software and Applications / v.30, no.12, 2003 , pp. 1247-1254 More about this Journal
Abstract
Currently. the north american symptomatic carotid endarterectomy trial, european carotid surgery trial, and common carotid method are used to measure the carotid stenosis for determining candidate for carotid endarterectomy using the projection angiography from different modalities such as digital subtraction angiography. rotational angiography, computed tomography angiography and magnetic resonance angiography. A new computerized carotid stenosis measuring system was developed using MR angiography axial image to overcome the drawbacks of conventional carotid stenosis measuring methods, to reduce the variability of inter-observer and intra-observer. The gray-level thresholding is one of the most popular and efficient method for image segmentation. We segmented the carotid artery and lumen from three-dimensional time-of-flight MRA axial image using gray-level thresholding technique. Using the measured intima-media thickness value of common carotid artery for each cases, we separated carotid artery wall from the segmented carotid artery region. After that, the regions of segmented carotid without artery wall were divided into region of blood flow and plaque. The calculation of carotid stenosis degree was performed as the following; carotid stenosis grading is(area measure of plaque/area measure of blood flow region and plaque) * 100%.
Keywords
carotid artery stenosis; magnetic resonance angiography; gray-level thresholding; medical image processing;
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