. American quarterly of roentgenology . / \. GAI PLATE BY DR. GEO. E. PfAHLER Pfaiiler: Gallstone Diagnosis 23 DETECTION OF GALLSTONES BY THE ROENTGEN RAY. BY GEORGE E. PFAHLER, M. D, PHILADELPHIA, detection of gall-stones by means of the Roentgen-Rayinvolves many difficulties :— 1. Their density differs little from the surrounding bile, andwith this shadow of the bile we must reckon the shadow castby the liver, which is also more or less saturated with bile. Ifthe biliary calculi are composed partially of calcium salts,they can be then more easily detected. Therefore, the greaterthe qu
. American quarterly of roentgenology . / \. GAI PLATE BY DR. GEO. E. PfAHLER Pfaiiler: Gallstone Diagnosis 23 DETECTION OF GALLSTONES BY THE ROENTGEN RAY. BY GEORGE E. PFAHLER, M. D, PHILADELPHIA, detection of gall-stones by means of the Roentgen-Rayinvolves many difficulties :— 1. Their density differs little from the surrounding bile, andwith this shadow of the bile we must reckon the shadow castby the liver, which is also more or less saturated with bile. Ifthe biliary calculi are composed partially of calcium salts,they can be then more easily detected. Therefore, the greaterthe quantity of bile surrounding the gall-stones in the gallbladder or the liver, the greater will be this difficulty. 2. Biliary calculi occur more frequently in stout , one meets the same difficulties that are involved inexamining stout people with renal calculi. The small shadowcast by the stone must be differentiated from the shadow castby a great mass of soft tissues. In such cases, we are con-fronted not only with the dens
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