FAST HADAMARD SPECTROSCOPIC IMAGING TECHNIQUES

被引:14
作者
GOELMAN, G
机构
[1] Department of Radiology, University of Pennsylvania, Philadelphia
来源
JOURNAL OF MAGNETIC RESONANCE SERIES B | 1994年 / 104卷 / 03期
关键词
D O I
10.1006/jmrb.1994.1078
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Fast Hadamard spectroscopic imaging (HSI) techniques are presented. These techniques combine transverse and longitudinal encoding to obtain multiple-volume localization. The fast techniques are optimized for nuclei with short T-2 and long T-1 relaxation times and are therefore suitable for in vivo P-31 spectroscopy. When volume coils are used in fast HSI techniques, the signal-to-noise ratio per unit time (SNRT) is equal to the SNRT in regular HSI techniques. When surface coils are used, fast HSI techniques give significant improvement of SNRT over conventional HSI. Several fast techniques which are different in total experimental time and pulse demands are presented. When the number of acquisitions in a single repetition time is not higher than two, fast HSI techniques can be used with surface coils and the B-1 inhomogeneity does not affect the localization. Surface-coil experiments on phantoms and on human calf muscles in vivo are presented. In addition, it is shown that the localization obtained by the HSI techniques are independent of the repetition times. (C) 1994 Academic Press, Inc.
引用
收藏
页码:212 / 218
页数:7
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