PULSATILE FLOW ARTIFACTS IN 2-DIMENSIONAL TIME-OF-FLIGHT MR-ANGIOGRAPHY - INITIAL STUDIES IN ELASTIC MODELS OF HUMAN CAROTID ARTERIES

被引：11

作者：

BUXTON, RB

KERBER, CW

FRANK, LR

机构：

[1] Department of Radiology, University of California at San Diego Medical Center, San Diego, California, 92103

来源：

JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING | 1993年 / 3卷 / 04期

关键词：

ARTIFACT; BLOOD; FLOW DYNAMICS; CAROTID ARTERIES; MATHEMATICAL MODEL; PHANTOMS; VASCULAR STUDIES;

D O I：

10.1002/jmri.1880030412

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Initial experimental and numerical analysis of artifacts due to pulsatile flow in two-dimensional time-of-flight (2D-TOF) magnetic resonance (MR) angiography are presented. The experimental studies used elastic models of the carotid artery bifurcation cast from fresh cadavers and accurately reproducing the twisting and tapering of the human blood vessels, allowing direct comparison of images with and without flow. Prominent image artifacts, including periodic ghosts and signal loss, were produced by pulsatile flow even though flow-compensated gradient waveforms were used. The dependence of artifacts due to partial saturation on pulse sequence parameters (TR and flip angle) was investigated theoretically for a simple pulsatile velocity profile and compared with experimental results from a model of a normal carotid artery. Signal reduction was observed proximal and distal to the stenosis in a model with a 70% internal carotid artery (ICA) stenosis and a model with 90% stenoses in both the ICA and the external carotid artery. Although this study deals exclusively with 2D-TOF imaging, the methods can also be applied to evaluate other MR angiography techniques.

引用

页码：625 / 636

页数：12

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