Intravenous arteriography using scanned projection radiography.

Abstract

Visualization of arteries using i.v. injections of contrast material requires an imaging system capable of excellent sensitivity to dilute concentrations of contrast media and adequate temporal resolution to minimize the effects of motion during the exposure. A line-scanned radiography system based on a CT [computed tomography] fan-beam detector (high-pressure Xe ionization chamber) was used for phantom and animal studies of i.v. arteriography to demonstrate the potential advantages of this method. Even though line-scanned systems require long scan times compared to existing radiographic methods, they are capable of showing rapidly moving arteries without blurring. Concentrations of 3 mg/ml of I was seen in vessels 2 mm in diameter. Phantom studies using kVp switching showed that bone or soft tissue could be selectively canceled.