Method for inspecting pipes, and radiographic non-destructive inspection apparatus

An X-ray radiation non-destructive inspection system, comprising:

• an X-ray radiation source and a two-dimensional X-ray radiation detector for moving on a guide rail which is arranged along a longer direction of a pipe which is installed in a plant which is a subject of inspection, and arranged opposedly to each other across the pipe;
• a C-shaped arm fixing said X-ray radiation source and said two-dimensional X-ray radiation detector for scanning said X-ray radiation source and said two-dimensional X-ray radiation detector along the pipe side by side;
• and
• a control and arithmetic apparatus for acquiring transmission image data from said two-dimensional X-ray radiation detector for every fixed distance which moves on said C-shaped arm, in which the transmission image data include data at a projection part of a first subject of inspection and a projection part of a second subject of inspection which is located at a different depth from the first subject of inspection;
• wherein said control and arithmetic apparatus comprises:
• an image acquisition device for acquiring the transmission image data output from said two-dimensional X-ray radiation detector;
• a control device for controlling a position of said C-shaped arm;
• a transmission image storage device for saving a transmission image acquired in said image acquisition device;
• a judging device which, in accordance with the transmission image from said transmission image storage device, discriminates a region of the pipe that requires image reconstruction for a tomogram or a stereoscopic image;
• and
• an image reconstruction arithmetic device that reconstructs a three-dimensional stereoscopic image by reconstructing a part of the first subject of inspection from a plurality of the transmission image data based on information of the projection part of the first subject of inspection which is a part of the pipe discriminated by said judging device, and by reconstructing a part of the second subject of inspection from a plurality of the transmission image data based on information of the projection part of the second subject of inspection.