断層撮影の開発秘話―特にX線回転撮影とX線廻転横断撮影（高橋信次）について

A little-known story regarding the development of tomography with special reference to rotation radiography and rotatory cross section radiography（S. Takahashi）

CTの登場によりかつての断層撮影が姿を消して久しい。先日まで開催されていた「空也上人と六波羅蜜寺展（東京国立博物館2022年3月1日～5月8日）」で，運慶作「地蔵菩薩坐像」が再び展示されていた。仏像を回転させて撮ったCTにより，その内部におびただしい納入品があることが明らかにされていた。約70年前，椅子に座って回転しながら撮影される不思議な体験をした故藤澤弘芳先生（元聖隷浜松病院副院長）のお話を思い出した。

History of the development of tomography was presented with special reference to rotation radiography and rotatory cross section radiography developed by Professor Shinji Takahashi. In 1946, he started to rese-arch the rotation radiography in Aomori city where was devastated by the defeat of the World War Ⅱ. He developed eight kinds of rotation radiography to take X-ray images of the transection of the subject. The principle of his work to take a cross section image was based on the reconstruction method from the sinograms on film, which was called rotatogram or rotation radiogram. P. Edholm termed a series of his researches Takahashi tomography as precursor of X-ray computed tomography in 1975. Later, a universal rotatography apparatus with the patient in decubitus position was also developed and used clinically both at home and internationally.