可搬型デジタル・ポータル・イメージング装置の全身照射への応用

概要

論文の詳細を見る
At the Saitama Children's Medical Center, the portable type digital portal imaging device (DPID), in which the detector and the tratment facility are not constructed as one body, was introduced. When it was applied to total body irradiation, the image quality under low dose conditions was examined, and its usefulness was investigated. In the investigation, when the source-detector distance (SDD) was changed from 1m to 5m, the inputoutput characteristics, noise and contrast resolution in respective modes of standard (256×256) and fast (256×128)were measured. The pixel value of 5m in relation to 1m decreased to 14%, and noise (variation coefficient) increased by 4.5 times. The pixel value of the fast mode in relation to the standard mode became 80%. Respective limits of detection according to the contrast-detail curves became 0.3% in an intensifying screen-film (S/F) system, 0.6% in the DPID at distance of 1m, and 1.2% at 5m. No difference in the evaluation between the modes was not observed. In the clinical cases, by using the fast mode for a S/F system, the images of head neck parts and a lung correction filter were clearly seen, at 1〜1.5 times of dose were obteined.
公益社団法人日本放射線技術学会の論文
1996-03-01