SIGNAL-TO-NOISE, RESOLUTION, AND BIAS FUNCTION-ANALYSIS OF ASYMMETRIC SAMPLING WITH ZERO-PADDED MAGNITUDE FT RECONSTRUCTION

被引:19
作者
HURST, GC
HUA, JM
SIMONETTI, OP
DUERK, JL
机构
[1] CASE WESTERN RESERVE UNIV,DEPT CHEM,CLEVELAND,OH 44106
[2] CASE WESTERN RESERVE UNIV,DEPT BIOMED ENGN,CLEVELAND,OH 44106
关键词
D O I
10.1002/mrm.1910270206
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
This report describes NMR image effects due to sampling asymmetry when using zero‐padded magnitude FT reconstruction. With this method, the MTF is not flat over the spatial frequency passband, so resolution cannot be accurately described by a single variable such as voxel size. At small to moderate asymmetry, shortened (reduced window duration) asymmetry provides increased S/N and decreased resolution, whereas shifted (constant window duration) asymmetry yields essentially constant S/N with simultaneously increased and decreased resolution. A bias function expression describes image distortion due to sampling in terms separable from the imaged object. The analyses are consistent with previous descriptions of perceived image differences related to data asymmetry. Copyright © 1992 Wiley‐Liss, Inc., A Wiley Company
引用
收藏
页码:247 / 269
页数:23
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