PURPOSE: To arbitrarily and easily set an optimum dynamic range by storing image output characteristics for the incident light quantity of an X-ray TV camera for respective operation modes with a multiplication factor as a parameter and deciding the multiplication factor and an optical diaphragm value in a control means through the use of a storage content.
CONSTITUTION: The image output characteristics for the incident light quantity of the X-ray TV camera are stored for the respective operation modes which are set by the number of scanning lines and the number of scanning lines per second with the multiplication factor as the parameter in a characteristic storage medium 9. At the time of photographing, a photographing controller 1 reads the stored value from the storage medium 9 and sets the multiplication factor of an avalanche multiplication- type image pickup tube 4 and the optimum value of an optical diaphragm 5 in accordance with a scanning mode. X-rays projected from an X-ray generation device 2 pass through a subject and are made incident on the X-ray fluorescent multiplier tube 4 through an X-ray grid 3. Fluorescence projected from the multiplier tube 4 is made incident on the TV camera 6 through the diaphragm and a lens system 5. The output signal is image-processed by an image collection/processing device 7, and the image is displayed on an image display device 8.
UEDA TAKESHI
ONODERA YOICHI
UMETANI KEIJI
YOKOUCHI HISATAKE
