腎の原體撮影 : X線廻轉撮影報の研究 第38報

This paper deals with the technique of Solidography applied to urological examination. The focus on X-ray tube and the rotation axes of two rotation tables were arranged so as to be placed in a vertical plane. On table A,nearer to the tube, a patient was stood while on table B which is farther to the tube was placed a box cassette. The X-ray tube was situated so high from the surface of the table that the central X-ray was inclined with approximately 300 to the horizontal film (Eastman Medical No-Screen-Film) piled in the box cassette (Fig. 1, 2a. 4). At the operation of roentgenography a person (33 year old healthy wife) stood on the rotation table with her kidney to the central X-ray and was rotated. At the same time as the rotation,exposure was started under the condition of 87 KV, 70 mA and 21 seconds. When the rotation table rotated from 0° to 360°, the exposure came to the end. On 15 roentgenograms thus taken there were imaged the cross section of the kidney every 7.4mm different in position respectively(Fig. 7) . From these roentgenograms we constructed the plastic figure of the kindney as follows. First, we drew two straight lines joining rectangular through the midcenter of the films, the logitudinal standard line and the horizontal one. Then we reduced photographically the X-ray images with the ratio of the focus-rotation table A distance to the focus-rotation table B distance, and obtained life size figures of cross section of the kidney. Then the contour of the kidney on this roentgenogram was hemmed accurately with the thin lead band of 7.4 mm in breadth and 0.1 mm in thickness. The gypus kneaded in mortar was poured into this closed band and thus a gypus plate of 7.4 mm in thickness was obtained. The gypus plate was marked with the longitudinal and horizontal standard lines of the roentgenogram on its surface. The plastic plates obtained thus were piled up one by one along the standard line. The plastic figure with rugged surface (Fig. 8. left) was removed its excessive projection, then the real smooth contour of the kidney was obtained (Fig. 8. right).