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The formation principle of X-ray computed tomography (CT) beam hardening and the effect law of noise on the correction result were studied. The suppression methods of noise impact in the process of beam hardening correction were presented from the following three aspects: First of all, aiming at the adverse factors of original beam hardening data, such as noise and measurement error, a method of simplifying...
Aiming at the difficulty of choosing filtering parameters of Non-Local Means (NLM) denoising algorithm for Cone-Beam Computed Tomography (CBCT) projection images, an adaptive NLM denoising algorithm is proposed. First, a simplified noise estimation method based on sub-block division is proposed to replace the approach of designating the background region, which can adaptively identify the background...
Reconstruction speed and image quality are the keys of 3D image reconstruction in cone beam CT (CBCT), this article have researched on the 3D image reconstruction in CBCT, and a self-adapting fast reconstruction method for high resolution images is presented. The method is based on the FDK algorithm and Z-line data first algorithm, which introduces the reconstruction task division algorithm based...
Aiming at the scatter problem in Flat Panel Detector (FPD)-based Digital Radiography (DR) and Computed Tomography (CT) imaging systems, a scatter detection and correction method based on Beam Attenuation Array (BAA) was proposed. In this method, the BAA is placed between the X-ray source and the detected object, and it is composed of the small ball array and its fixed substrate. The scatter values...
The main manifestations of artifacts and their causes in cone-beam computed tomography (CBCT) system were studied, and then the general CBCT digital radiography (DR) imaging model was described with a mathematical expression. On this basis, a new expression of DR imaging model was proposed according to the actual imaging noise and enforceability of corrective action, and so the projection image was...
According to the noise properties and the serial slice image characteristics in cone-beam computed tomography (CBCT) system, an adaptive filter for serial slice images of CBCT was proposed. The judging criterion for the noise is established firstly. All pixels are classified into two classes, one is the pixels which are corrupted by Gauss noise and the other is the pixels corrupted by impulse noise...
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