胸部CRの経時的差分処理画像に及ぼす吸気量の影響

概要

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A difference in the inspiration lung volume between previous and current chest radiographs may cause an artifact similar to ground-glass opacity on temporal subtraction images. We examined this artifact using the chest computed radiography(CR)images with different inspiration volumes of normal volunteers. This artifact caused by a difference in the inspiration volume between previous and current chest radiographs did not appear in upper and middle lung fields, but was recognized only in the lower lung field overlying the diaphragm. When the difference in inspiration volume for a temporal subtraction image was about 20% of vital capacity, the fractional area with the artifact was about 4% of the total area of the lung field, and the remaining 96% of the lung field showed good subtraction images without artifacts. We conclude that the artifact of a temporal subtraction image caused by the difference in the inspiration volume was small and would not be an obstacle to diagnosing diffuse ground-glass opacity encountered in various diffuse interstitial lung diseases.
社団法人日本放射線技術学会の論文
2001-07-20