Shimadzu Corporation

Keiichi Fujii

Toshinori Yoshimuta

Koichi Tanabe

Susumu Adachi

Shoichi Okamura

Shinya Hirasawa

Akihiro Nishimura

Shigeya Asai

Masatomo Kaino

Hiroshi Koyama

A radiographic apparatus obtains lag-free radiation detection signals with lag-behind parts removed from radiation detection signals taken from a flat panel X-ray detector as X rays are emitted from an X-ray tube. The lag-behind parts are removed by a recursive computation on an assumption that the lag-behind part included in each X-ray detection signal is due to an impulse response formed of exponential functions, N in number, with different attenuation time constants. X-ray images are created from the lag-free radiation detection signals.

Radiographic apparatus that removes time lag by recursive computation

A radiographic apparatus removes lag-behind parts from radiation detection signals taken from an FPD as X rays are emitted from an X-ray tube, on an assumption that the lag-behind part included in each X-ray detection signal is due to an impulse response formed of a plurality of exponential functions with different attenuation time constants. When a single attenuation time constant and intensity are provisionally set, checking is made whether an attenuation to a noise level of X-ray detection signals occurs in an X-ray non-emission state following an X-ray emission state. When the set attenuation time constant and intensity are found appropriate (OK), the impulse response having the single exponential function is determined valid. Corrected radiation detection signals are obtained by removing the lag-behind parts using the impulse response determined.

Radiographic apparatus and radiation detection signal processing method

In the radiographic apparatus according to this invention, when a radiographic mode designatordesignates a non-standard radiographic mode, a signal correctoruses defect information stored in one of non-standard image defect information memoriesB&#x2013;E for correcting X-ray detection signals outputted from an FPDSince the pixel defect information for non-standard X-ray images is acquired by a pixel defect information converterthrough a conversion from defect information for standard X-ray images stored in a standard image defect information memoryA, it is unnecessary to collect output signals for pixel defect information acquisition from the FPDall over again. As a result, abnormal X-ray detection signals due to defects of radiation detecting elements may be corrected promptly, regardless of how the radiation detecting elements are assigned to the pixels in the X-ray images.

Radiographic apparatus, and radiation detection signal processing method

Growing community of inventors

Kyoto-fu, Japan

Keiichi Fujii