DSA装置のファイナルMTFの測定

概要

論文の詳細を見る
Recently, a digital subtraction angiographic (DSA) system and a computed radiographic (CR) system are widely used for X-ray examination. The resolution property in analog system has been evaluation by modulation transfer function (MTF), however, in digital system, the MTF is not available because it includes an aliasing error which is caused by under sampling. The presampling MTF has been used for digital system, but it evaluates only presampling stage, and does not evaluate overall system. In previous paper, we proposed the final MTF which includes MTF of overall system without aliasing error, and evaluated resolition property of a computed radiographic system (CR) by final MTF. In this paper, we evaluate resolition property of the DSA system by final MTF. The final MTF is obtained from multiplying MTFs of analog components in digital system and it is equal to subtraction the aliasing error from the overall MTF. We concluded that the final MTF is useful for evaluation of imaging property in digital system.
公益社団法人日本放射線技術学会の論文
1995-01-01