造影MRAにおけるparadoxical suppressionの影響

概要

論文の詳細を見る
Magnetic resonance angiography(MRA)with contrast medium is increasingly being used in examination of the abdomen, pelvis, and lower limbs. However, angiography at opposed phase causes paradoxical suppression(PS)due to the higher fat content of these areas. We evaluated the effect of PS on the ability to visualize blood vessels. The items evaluated included the effect of contrast medium concentration and TE(echo time)on PS as well as a comparison of fat suppression with the subtraction technique by referring to a mock blood vessel and pictures obtained by subjecting volunteers to MRA with contrast medium. Shorter TE and higher concentrations of contrast medium both reduced PS. The ability to visualize blood vessels was reduced by the subtraction technique, as compared with fat suppression. In clinical studies, fat suppression is essential. Hence, when MRA with contrast medium is performed with an apparatus or at a site where fat suppression is not feasible, PS must be taken into account to establish parameters.
社団法人日本放射線技術学会の論文
2001-11-20