HIGH SIGNAL INTENSITY IN MR IMAGES OF CALCIFIED BRAIN-TISSUE

被引：196
作者：
HENKELMAN, RM
WATTS, JF
KUCHARCZYK, W
机构：
[1] UNIV TORONTO,DEPT RADIOL,TORONTO M5S 1A1,ONTARIO,CANADA
[2] UNIV TORONTO,DEPT MED BIOPHYS,TORONTO M5S 1A1,ONTARIO,CANADA
来源：
RADIOLOGY | 1991年 / 179卷 / 01期
关键词：
BRAIN; CALCIFICATION; MR STUDIES; MAGNETIC RESONANCE (MR); TISSUE CHARACTERIZATION;
D O I：
10.1148/radiology.179.1.1848714
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：
Calcified lesions of the brain occasionally appear bright on T1-weighted MR images. This report shows that particulate calcium can reduce T1 relaxation times by a surface relaxation mechanism. Calcium particles with greater surface area show greater T1 relaxivity. Reduced proton density and reduced T2 tend to diminish signal intensity, but reduced T1 increases signal intensity. Thus, for concentrations of calcium particulate of up to 30% by weight, the signal intensity on standard T1-weighted images increases but subsequently decreases.
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页码：199 / 206
页数：8
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