A VELOCITY K-SPACE ANALYSIS OF FLOW EFFECTS IN ECHO-PLANAR AND SPIRAL IMAGING

被引:141
|
作者
NISHIMURA, DG [1 ]
IRARRAZABAL, P [1 ]
MEYER, CH [1 ]
机构
[1] STANFORD UNIV,DEPT ELECT ENGN,STANFORD,CA 94305
关键词
FLOW IMAGING; FAST IMAGING; ANGIOGRAPHY; MAGNETIC RESONANCE IMAGING;
D O I
10.1002/mrm.1910330414
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
A velocity k-space formalism facilitates the analysis of flow effects for imaging sequences involving time-varying gradients such as echo-planar and spiral. For each sequence, the velocity k-space trajectory can be represented by k(v)(k(r)); that is, its velocity-frequency (k(v)) position as a function of spatial-frequency (k(r)) position. In an echo-planar sequence, k(v) is discontinuous and asymmetric. However, in a spiral sequence, k(v) is smoothly varying, circularly symmetric, and small near the k(r) origin. To compare the effects of these trajectory differences, simulated images were generated by computing the k-space values for an in-plane vessel with parabolic flow. Whereas the resulting echo-planar images demonstrate distortions and ghosting that depend on the vessel orientation, the spiral images exhibit minimal artifacts.
引用
收藏
页码:549 / 556
页数:8
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