[Correlation between videodensity and iodine concentration in DSA--a prospective research].

Abstract

This article is a prospective research on parametric imaging of DSA. With the help of phantoms, the authors finished the transformation of videodensity into iodine concentration. The value of iodine concentration will be used as the basis of parametric imaging instead of videodensity which is a non-dimensional value. In part "I" of this article, the authors obtained a group of attenuation curves of 24 iodine samples, which are energy dependent, and verified the possibility of transformation of videodensity into iodine concentration under the non-standard conditions. In part "II", the authors designed a group of phantoms and an exposure program in order to accomplish the density-concentration transformation under clinical conditions. The feasibility of the method was confirmed.