Radiographic apparatus

摘要

One object of this invention is to provide radiography apparatus with suppressed exposure to a subject in tomography mode. An FPD provided in X-ray apparatus according to this invention converts X-rays into electric signals, and thereafter amplifies the signals to output them to an image generation section. According to this invention, an amplification factor is higher in a tomography mode than in a spot radiography mode. A tomographic image is obtained through superimposing two or more fluoroscopic image. In comparison of the fluoroscopic images, they differ from one another in appearance of the false image. Accordingly, superimposing the images may achieve cancel of the false images. In this way, the tomographic image finally obtained has no false image.

主权项

1. Radiographic apparatus comprising:
a radiation source for emitting radiation; a radiation source controlling device for controlling output of radiation; a radiation detecting device for detecting radiation; a moving device for moving the radiation source and the radiation detecting device synchronously; an image generation device for generating a fluoroscopic image based on a detection signal from the radiation detecting device; and a superimposing device for superimposing a series of fluoroscopic images continuously taken while the radiation source and the radiation detecting device moves or superimposes an identical site of the subject in the series of fluoroscopic images one another, thereby generating a tomographic image, the radiation detecting device comprising: (A) a radiation conversion device for converting radiation entering the radiation detecting device into an electric signal; and (B) an amplifying device for amplifying the electric signal by a given amplification factor, wherein letting an imaging mode where the radiation detecting device is irradiated with single shot radiation to obtain a single fluoroscopic imaging be a spot radiography mode, and an imaging mode where a tomographic image is obtained be a tomography mode, an amplification factor is higher in the tomography mode than in the spot radiography mode, and output of single-shot radiation from the radiation source is less in the tomography mode than in the spot radiography mode.