X線テレビジョン装置を応用した頭部X線写真撮影条件の制御方法について

抄録

A measuring system of the exit dose from a patient to control physical conditions of exposure in the skull roentgenography was described in this report. The system is composed of a combination of a X-ray T. V., a cinefluorographic apparatus and a photo-multiplier tube. The fluorescent emission from the output screen of the X-ray T. V. was measured as photocurrent instead of measuring the exit X-ray dose. The photocurrent values thus obtained under various exposure dose rates were linearly proportional to their dose rates. However, the photocurrent values among various patients were not correlated to their sizes of the skulls. The author therefore stressed that it is impossible to obtain an informative skull roentgenogram unless the transmitted dose from each individual to X-ray film and intensifying screen system is measured by such a measuring devise.