Fast 3D T2-weighted MRI with Hadamard encoding in the slice select direction

被引:8
作者
Goelman, G [1 ]
机构
[1] Hadassah Hebrew Univ Hosp, Dept Med Biophys & Nucl Med, Human Biol Res Ctr, IL-91120 Jerusalem, Israel
关键词
Hadamard encoding; 3D MRI; multiple slab;
D O I
10.1016/S0730-725X(00)00205-8
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 fast method to obtain 3-dimensional (3D) magnetic resonance imaging with long repetition times is presented. It can be used to obtain fast 3D MRI with for example T-2 or diffusion weighted imaging. The method uses a 3D multiple thin slab sequence with radio frequency encoding, preferably Hadamard encoding, in the slice select direction. The point-spread function of the Hadamard-encoded slices is close to ideal even at low encoding numbers. This allows the acquisition of 3D data volumes with tolerable image quality up to four times faster than is possible using Fourier phase encoding. The scope of the method includes both longitudinal and transverse encoding. Longitudinal encoding provides a better point spread function than transverse encoding, at the expense of having to discard one slice per slab. The method is demonstrated experimentally for 4th order longitudinal Hadamard encoding to obtain 3D T-2-weighted images. (C) 2000 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:939 / 945
页数:7
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