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首页> 外文期刊>Medical Physics >Artifact analysis of approximate helical cone-beam CT reconstruction algorithms.
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Artifact analysis of approximate helical cone-beam CT reconstruction algorithms.

机译:近似螺旋锥束CT重建算法的伪影分析。

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摘要

In this paper, four approximate cone-beam CT reconstruction algorithms are compared: Advanced single slice rebinning (ASSR) as a representative of algorithms employing a two dimensional approximation, PI, PI-SLANT, and 3-PI which all use a proper three dimensional back-projection. A detailed analysis of the image artifacts produced by these techniques shows that aliasing in the z-direction is the predominant source of artifacts for a 16-row scanner with 1.25 mm nominal slice thickness. For a detector with isotropic resolution of 0.5 mm, we found that ASSR and PI produce different kinds of artifacts which are almost at the same level, while PI-SLANT produces none of these artifacts. It is shown that the use of redundant data in the 3-PI method suppresses aliasing artifacts efficiently for both scanners.
机译:在本文中,比较了四种近似的锥束CT重建算法:高级单层重组(ASSR)作为采用二维近似PI,PI-SLANT和3-PI的算法的代表,它们均使用适当的三维反投影。对通过这些技术产生的图像伪像的详细分析表明,对于标称厚度为1.25 mm的16行扫描仪,z方向上的混叠现象是伪像的主要来源。对于各向同性分辨率为0.5 mm的探测器,我们发现ASSR和PI会产生几乎处于同一水平的不同种类的伪像,而PI-SLANT不会产生这些伪像。结果表明,在3-PI方法中使用冗余数据可以有效地抑制两个扫描仪的混叠失真。

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