:COMPOSITION AND CT ATTENUATION VALUE

概要

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In 272 cases with gallstone disease, the relationship between the gross appearance of gallstones or the stone composition analyzed by infrared spectroscopy and the CT appearance or the CT attenuation value of stones was studied to evaluate a clinical usefulness of computed tomography on the diagnosis of gallstones. 23% of gallbladder stones, 6% of common bile duct stones, none of intrahepatic stones, and as a whole 15.5% of all gallstones were radiopaque on the abdominal plain X-ray films. When compared with the main composition of stones analyzed by infrared spectroscopy, the CT attenuation value was lower than 60 Hounsfiled Units (H. U.) in cholesterol, 60 to 140 H.U. in calcium bilirubinate and it was higher than 140 H.U. in calcium carbonate. Therefore, CT scan was very useful not only on the diagnosis of gallstone disease, but also to evaluate the main composition of stones, the mechanism of stone formation and the indication for medical treatment.
財団法人日本消化器病学会の論文