頚部3D-CT angiographyにおける造影効果と狭窄病変の描出能

概要

論文の詳細を見る
It is difficult to obtain three-dimensional (3D) images by carotid three-dimensional CT-angiography (3D-CTA) in every patient, and 3D-CTA tends to be affected by the contrast medium and method of injection. We, thererfore, investigated how contrast enhancement is affected by various protocols, observing the time-density curves in the case of our original phantom and of dynamic scanning. Experiments were conducted to determine the Hounsfield unit and threshold unit by changing the diameter of the vascular model as well as the contrast enhancement and contrast medium injection protocols. When the diameter of the vascular model decreased, Hounsfied units also decreased. The higher the Hounsfield unit, the more prominent this tendency became. When the Hounsfield units of two contrast media were the same, the diameter of the vascular model affected the 3D image;the smaller the size, the higher the appropriate threshold unit. We succceeded in eliminating individual differences in the 3D images by quickly injecting a large volume of lowdensity contrast medium.
公益社団法人日本放射線技術学会の論文
1998-07-20