Three-dimensional digital imaging method of large view field cone-beam X-ray tilting scanning of biased detector

Abstract

The invention relates to a three-dimensional digital imaging method of the large view field cone-beam X-ray tilting scanning of a biased detector, belonging to the technical field of X-ray computerized tomography (CT). In the three-dimensional digital imaging method, the area array detector is placed to be biased, and an X-ray source is used for generating cone-beam X-rays which irradiate a member imaging area with a certain angle in a penetrating and tilting way relative to the length and width surface of a member; in the scanning process, the X-ray source and the area array detector are static, the member rotates in an angle of 360 degrees in an equal angle and step length way surrounding a rotating shaft, and the area array detector acquires an X-ray signal modulated by the member under each rotation angle. A three-dimensional computerized tomography image of a scanning area can be reestablished and obtained by a data truncation smoothing preprocessing method and a filtering back projection reestablishing arithmetic according to data obtained by the area array detector under the scanning angle of 360 degrees. Compared with the traditional tilting scanning method, the three-dimensional digital imaging method can double the tilting scanning imaging view field without changing the system hardware and the scanning speed and has high reestablishment quality, simple process and high efficiency.

Description

technical field [0001] The invention relates to a large field of view cone beam X-ray oblique scanning three-dimensional digital imaging method with detector offset, belonging to the technical field of X-ray computer tomography (CT). Background technique [0002] In the X-ray CT system, the X-ray source emits X-rays, which pass through a certain area of ​​the detected object from different angles, and the detector placed opposite the ray source receives them at corresponding angles, and then attenuates the rays according to different degrees at each angle. Using a certain reconstruction algorithm and computer calculations, the ray attenuation coefficient distribution mapping image of the scanned area of ​​​​the object is reconstructed, so that the image can be reconstructed by projection, and the characteristics of the medium density, composition, and structural shape of the object in the area can be reproduced without loss. . [0003] The current CT technology, whether it ...

AI Technical Summary

Problems solved by technology

[0005] The technical solution of the present invention is to solve the problem of small imaging field of view and low detection efficiency faced by traditional CL imaging, and to provide a three-dimensional digital imaging method with a large field of view cone beam X-ray oblique scanning with detector offset, in which system hardware and scanning Under the condition of constant speed, the oblique scanning imaging field of view can be doubled, the reconstruction quality is high, and the process is simple and efficient

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