基于散点建模的迭代- fbp双谱CT重建算法。

IF 1.7 3区 医学 Q3 INSTRUMENTS & INSTRUMENTATION
Journal of X-Ray Science and Technology Pub Date : 2025-07-01 Epub Date: 2025-04-28 DOI:10.1177/08953996251332472
Jingna Zhang, Wenfeng Xu, Ran An, Huitao Zhang, Yunsong Zhao, Xing Zhao
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引用次数: 0

摘要

双光谱计算机断层扫描(DSCT)由于其卓越的区分不同材料的能力,在医学和工业成像中得到了广泛的应用。然而,DSCT的一个重大挑战在于x射线散射的存在,这降低了重建图像的质量。传统的DSCT重建方法往往忽略了散射的影响,导致基材分解不准确,特别是在严重散射条件下。针对这一局限性,本文提出了一种基于滤波反投影(FBP)方法的迭代DSCT重建算法。具体来说,我们首先改进了常用的多色衰减模型,以更准确地解释散射的影响。在此改进模型的基础上,我们提出了一种结合FBP方法的迭代重建方法,实现了高质量的DSCT重建,有效地减轻了散射伪影,提高了基材料分解的精度。在模拟幻影和真实数据上的实验证明了该方法在DSCT重建中的优越性能。值得注意的是,我们的方法在不需要额外的预处理或后处理步骤的情况下实现了出色的基物质分解结果,使其特别适合实际的DSCT应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An iterative-FBP dual-spectral CT reconstruction algorithm based on scatter modeling.

Dual-spectral computed tomography (DSCT) has found extensive application in medical and industrial imaging due to its superior capability to distinguish different materials. However, a significant challenge in DSCT lies in the presence of X-ray scatter, which degrades the quality of reconstructed images. Traditional DSCT reconstruction methods often neglect the impact of scatter, leading to inaccurate basis material decomposition, especially under severe scatter conditions. To address this limitation, this paper proposes an innovative iterative DSCT reconstruction algorithm based on the filtered back-projection (FBP) method. Specifically, we first refine the commonly used polychromatic attenuation model to more accurately account for the effects of scatter. Building on this improved model, we propose an iterative reconstruction approach combined with the FBP method, achieving high-quality DSCT reconstructions that effectively mitigate scatter artifacts and improve the accuracy of basis material decomposition. Experiments on both simulated phantoms and real data demonstrate the superior performance of the proposed method in DSCT reconstruction. Notably, our approach achieves outstanding basis material decomposition results without requiring additional pre or post-processing steps, making it particularly suitable for practical DSCT applications.

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来源期刊
CiteScore
4.90
自引率
23.30%
发文量
150
审稿时长
3 months
期刊介绍: Research areas within the scope of the journal include: Interaction of x-rays with matter: x-ray phenomena, biological effects of radiation, radiation safety and optical constants X-ray sources: x-rays from synchrotrons, x-ray lasers, plasmas, and other sources, conventional or unconventional Optical elements: grazing incidence optics, multilayer mirrors, zone plates, gratings, other diffraction optics Optical instruments: interferometers, spectrometers, microscopes, telescopes, microprobes
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