Experimental and theoretical studies of vessel contrast-to-noise ratio in intracranial time-of-flight MR angiography

被引:11
作者
Du, YPP [1 ]
Parker, DL [1 ]
Davis, WL [1 ]
Cao, G [1 ]
Buswell, HR [1 ]
Goodrich, KC [1 ]
机构
[1] UNIV UTAH,HLTH SCI CTR,DEPT RADIOL,MED IMAGING RES LAB,SALT LAKE CITY,UT 84132
来源
JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING | 1996年 / 6卷 / 01期
关键词
MR angiography; contrast-to-noise ratio; flow imaging; time-of-flight MRA; multiple overlapping thin slab acquisition (MOTSA); Bloch equations;
D O I
10.1002/jmri.1880060120
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
CNR studies were performed for human intracranial vessels in 3D MRA data sets. The CNR dependency of different imaging parameters, such as flip angle, field of view, echo time, repetition time, and echo readout symmetry, was studied for vessels in the region of the circle of Willis, A theoretical model was developed for MR vascular imaging based on the Bloch equations and Fourier imaging theory, This model predicts the MR image intensity of vessels from basic subject parameters, such as the relaxation times of blood and stationary tissue, vessel dimension, and now velocity, and the parameters of the imaging technique, such as flip angle, voxel volume, repetition time, and echo time, For most experiments, the model was found to fit the experimental results well, The validity of this model allows the optimization of imaging parameters to maximize vessel CNR in MR angiography.
引用
收藏
页码:99 / 108
页数:10
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