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 candidates 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 methods for image segmentation. We segmented the carotid artery and lumen from three-dimensional time-of-flight MRA axial images using gray-level thresholding technique. Using the measured intima-media thickness value of common carotid artery for each case, 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 follows: carotid stenosis grading = (area measure of plaque/area measure of blood flow region and plaque) * 100%. No previous study has developed the carotid stenosis measuring method using MRA axial image. The new computerized stenosis measuring system has advantage over conventional caliper measuring methods; it will not only greatly increase the speed of stenosis measuring but also reduce the variability between readers. It should also reduce the variability between different institutions.
journal_name
Magn Reson Imagingjournal_title
Magnetic resonance imagingauthors
Kim DY,Park JWdoi
10.1016/j.mri.2004.01.007subject
Has Abstractpub_date
2004-04-01 00:00:00pages
353-9issue
3eissn
0730-725Xissn
1873-5894pii
S0730725X04000256journal_volume
22pub_type
杂志文章abstract：:Magnetic resonance imaging (MRI) and spectroscopy (MRS) have contributed considerably to clinical radiology, and a variety of MR techniques have been developed to evaluate pathological processes as well as normal tissue biology at the cellular and molecular level. However, in comparison to nuclear imaging, MRI has rel...
journal_title：Magnetic resonance imaging
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doi：10.1016/j.mri.2016.12.008
更新日期：2017-05-01 00:00:00
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更新日期：1994-01-01 00:00:00
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更新日期：1990-01-01 00:00:00
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journal_title：Magnetic resonance imaging
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abstract：INTRODUCTION:Compared to standard arterial-only first-pass MR-angiography (FPMRA), imaging during the equilibrium phase of a blood pool contrast agent (steady state) has been shown to provide higher image quality and better stenosis grading. Homogenous Dixon fat-suppression promises to increase contrast by suppression ...
journal_title：Magnetic resonance imaging
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doi：10.1016/j.mri.2015.07.005
更新日期：2015-11-01 00:00:00
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journal_title：Magnetic resonance imaging
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更新日期：2015-05-01 00:00:00
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journal_title：Magnetic resonance imaging
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更新日期：2002-06-01 00:00:00
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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doi：10.1016/j.mri.2014.02.007
更新日期：2014-07-01 00:00:00
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journal_title：Magnetic resonance imaging
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更新日期：2010-10-01 00:00:00
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更新日期：2001-06-01 00:00:00
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journal_title：Magnetic resonance imaging
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更新日期：2004-12-01 00:00:00
abstract：:The purpose of this study was to evaluate the diagnostic potential of a high-resolution magnetic resonance (MR) venography technique in patients with cerebral arteriovenous malformations (AVMs). A high-resolution 3D gradient echo sequence was used with a long echo time TE to obtain venous information down to sub-pixel...
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doi：10.1016/s0730-725x(99)00084-3
更新日期：1999-12-01 00:00:00
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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更新日期：1996-01-01 00:00:00
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
pub_type： 杂志文章
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更新日期：1998-05-01 00:00:00
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journal_title：Magnetic resonance imaging
pub_type： 杂志文章
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更新日期：2013-11-01 00:00:00
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journal_title：Magnetic resonance imaging
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更新日期：2006-10-01 00:00:00
