空気注腸造影法 : 実験的ならびに臨床的研究
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概要
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There are various limitations in screening methods for colorectal cancers by the fecal occult test and the sigmoidscopy. To help develop a simple, rapid and low-cost radiographic screening method for the entire colon, the author has newly devised the "Air Colography(ACG)" using only air as the contrast media. In experimental studies, two types of X-ray shootings were performed ; soft radiographs of unopened resected specimens extended by injecting air ; TV shots of same specimens immersed in 20 cm of water. In both shootings, morbidities were revealed as distinctly as in barium enema. Additionally, in the phantom experiment using imitative intestinal tract in which pseudotumors of various sizes were planted, protrusions as small as 3mm could be seen. The following cases were used in clinical studies of the ACG : 21 cases of advanced colorectal cancer, 19 caSes of polyps and polyposis for a total of 44 cases with 77 lesions that had already been diagnosed by the barium enema (based on the Brown's method) were taken for the ACG, but 800-1200 cc of only air were injected. For the X-ray shootings, 5 directions were principally used -AP, PA, RAO, LAO and LAT. 76 out of 77 lesions were detected by the barium enema for a detectability ratio of 98.7%, while 74 lesions were detected by the ACG for the ratio of 96.1%. In protrusions, 9 out of 10 lesions under 10mm and all 30 lesions over 10mm, including 4 early cancers, were well detected. In RAO direction, findings could be seen in 46 out of 50 films for a ratio of 92%, for a mean average of 84.5%. The RAO direction was also superior in identifing morbidities. Above mentioned, it can be concluded that the ACG is a method which can be applied to mass screening for the entire colon.
- 神戸大学の論文