X-ray CT solid-state detector

摘要

An x-ray CT solid-state detector provided with detector blocks each having a substrate, a photodiode array secured to the substrate and a scintillator array secured to the photodiode array, and with a collimator device having a plurality of collimator plates secured to a support body, and arranged such that transmitted x-rays obtained by irradiating a fan-shape x-ray beam from an x-ray source onto a subject to be tested, are guided to the detector blocks through the collimator device. There is secured, to each substrate, a groove plate having at a predetermined position a groove into which a collimator plate is to be fitted. The scintillator and photodiode arrays are secured to each substrate with a predetermined positional relationship between the scintillator and photodiode arrays and the groove plate maintained. Each detector block and the collimator device are fixed to each other with a collimator plate fitted in the groove of the groove plate. The collimator plates are positioned directly with respect to the groove plates and the scintillator and photodiode arrays are fixed to the substrates with a predetermined positional relationship between the scintillator and photodiode arrays and the groove plates maintained. This enhances the precision with which the scintillator elements are positioned with respect to the collimator plates.