Three-dimensional cone-beam computed tomography imaging method and device

Abstract

The embodiment of the invention provides a multi-mounted three-dimensional cone beam computer tomography method and device.The method comprises the steps that a two-dimensional projection image sequence collected by a detector is acquired; logarithmic demodulation is performed on the two-dimensional projection image sequence to obtain a two-dimensional line integral image sequence; the two-dimensional line integral image sequence is segmented to obtain two-dimensional line integral image subsequences corresponding to all objects of multiple objects; image reconstruction is performed on the two-dimensional line integral image subsequences corresponding to all the objects through an algebra iterative algorithm to obtain three-dimensional CT slice images corresponding to all the objects.Compared with an existing cone beam CT scanning technique, the method has the advantages that the scanning imaging efficiency is improved; the transmission thickness does not need to be increased, no signal crosstalk is generated, and the CT image quality is improved; voltage of an X-ray source does not need to be increased, and the hardware cost of CT scanning equipment is saved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of X-ray computerized tomography, and in particular to a method and device for multi-package three-dimensional cone-beam computerized tomography. Background technique [0002] In the X-ray computer tomography (Computed Tomography, referred to as CT) system, the X-ray source emits X-rays, which pass through a certain area of ​​the object to be detected from different angles, and the detectors placed opposite the ray source receive them at corresponding angles. Then, according to the different degrees of attenuation of rays at various angles, a certain reconstruction algorithm and computer operations are used to reconstruct the distribution mapping image of the ray line attenuation coefficient in the scanned area of ​​the object, so as to realize the image reconstruction by projection and reproduce the object in this area without loss. The characteristics of the medium density, compositio...

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Problems solved by technology

[0003] Imaging efficiency has always been one of the main factors restricting the wide application of CT. In order to improve imaging efficiency, cone beam CT scanning technology has been proposed in the prior art. This technology realizes simultaneous scanning and imaging of multiple objects by bundling. However, this technology requires high The voltage X-ray source increases the thickness of the transillumination, which leads to an increase in the hardware cost of the CT scanning equipment. At the same time, the crosstalk of signals between multiple objects affects the quality of the CT image.

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