A COMPUTER-SIMULATION PROGRAM FOR MR-IMAGING - APPLICATION TO RF AND STATIC MAGNETIC-FIELD IMPERFECTIONS

被引:26
作者
OLSSON, MBE
WIRESTAM, R
PERSSON, BRR
机构
[1] Department of Radiation Physics, Lund University Hospital, Lund
关键词
MAGNETIC RESONANCE IMAGING; COMPUTER SIMULATION; METALLIC IMPLANTS; ARTIFACTS;
D O I
10.1002/mrm.1910340418
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 computer simulation program capable of demonstrating various artifacts, such as image distortion caused by metallic implants in MR imaging, is presented, The structure of the program allows for the implementation of various imaging situations as long as spins only experience weak interaction, i,e,, the Bloch equations are obeyed, The raw data are obtained by repeatedly applying the Bloch equations to the magnetization vector of each point of the simulated object, throughout the pulse sequence, With only a limited number of spins in each voxel, the effects of intravoxel dephasing and rephasing require special attention, and algorithms for this have been implemented.
引用
收藏
页码:612 / 617
页数:6
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