| 摘要 |
PURPOSE:To prevent the lowering of the sensitivity of a detector due to the deterioration of the radiation of a scintillator and to also prevent the deterioration of a display image by irradiating the scintillator with light having a predetermined wavelength by a fading light source. CONSTITUTION:The colored part of a scintillator 2 has a property generating fading by the irradiation with light having a predetermined wavelength and a detector for X-ray CT lowered in its sensitivity by coloration can be returned to the original sensitivity by the irradiation with the light having the predetermined wavelength. In this case, after the photographing of an object is completed, the scintillator 2 is irradiated with the light emitted from a fading light source 4 to prevent the lowering of the sensitivity of the detector 1. The power supply of the fading light source 4 is turned OFF at the time of the photographing of the object. That is, even when a colored part is generated in the scintillator 2 at the time of the photographing of the object, by irradiating the scintillator 2 with the light having the predetermined wavelength by the fading light source 4 after the photographing of the object is completed, the lowering of the sensitivity of the detector 1 is prevented and the fluctuation of a CT value or the generation of an artifact is reduced and the lowering of the quality of a display image can be prevented. |
