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USE OF AMI-227 AS AN ORAL MR CONTRAST AGENT
被引:10
|作者:
ROGERS, J
LEWIS, J
JOSEPHSON, L
机构:
[1] Advanced Magnetics Inc., Cambridge, MA 02138
关键词:
CONTRAST MEDIA;
ULTRASMALL SUPERPARAMAGNETIC IRON OXIDE;
ORAL;
BRIGHTENING;
DARKENING;
D O I:
10.1016/0730-725X(94)92458-9
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:
We report the use of an ultrasmall superparamagnetic iron oxide colloid AMI-227 as an oral contrast agent. Due to the small size, AMI-227 has a larger effect on T(1) than larger superparamagnetic iron oxides colloids like ferumoxsil, At 2 T, AMI-227 had an R(2)/R(1) of 11.4 compared with an R(2)/R(1) for the superparamagnetic iron oxide ferumoxsil of 179. The R(1)s of the two agents were 7.1 and 1.6 mM(-1) s(-1), for AMI-227 and ferumoxsil, respectively. Due to its smaller R(2)/R(1), orally administered AMI-227 can produce brightening or darkening of the lumen of the GI tract, depending on instrument parameters. At 1 mM Fe, image brightening (2 T, TR = 300, TE = 25) or image darkening of the GI tract (2 T, TR = 1500, TE = 80) was obtained. The ability of AMI-227 to produce either image brightening or darkening suggests it may be useful as an MR contrast agent for the GI tract.
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页码:631 / 639
页数:9
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