[An evaluation of computed radiography in contrast-enhanced imaging of the gastric area].
The usefulness of computed radiography (CR) in contrast-enhanced imaging of the stomach was evaluated. First, the spatial resolution and density resolution of CR under the conditions of contrast-enhanced imaging of the digestive tract were examined. Spatial resolution was lower, but density resolution was similar, in comparison with those of conventional film screen (FS). Both were better in CR at a low dose. Evaluation of processing conditions for CR using a gastric phantom indicated that the use of N for gamma type (GT) and T for response type (RT) in the left image and the use of A for GT and F for RT in the right image is recommended. Evaluation of the relationship between the stomach segment and response enhancement (RE) showed that RE should not be very strong in cases where segments to be visualized are limited to the lower part of the stomach. With an optimal RE, the image quality of the gastric segment was better in CR than in FS. When dynamic-range control processing was performed in an area overlapped by colon gas, obscure parts became visually recognizable. CR is considered to be useful also for contrast-enhanced imaging of the digestive tract.
Tatsu
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Department of Radiology, Osaka Medical College.
D000328:Adult; D002908:Chronic Disease; D005260:Female; D005756:Gastritis / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement; D013270:Stomach / Q000000981:diagnostic imaging*