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使用有限投影的快速CT成像:在多材料幻影上对FBP和SIRT-FBP重建的性能分析

Rochan Rifai¹, Ni Luh Sri Maharani¹, Gede Bayu Suparta¹

¹Department of Physics, Universitas Gadjah Mada, Sekip Utara, Yogyakarta, 55281, Indonesia.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

|February 13, 2026

概括

这项研究比较了过后投影 (FBP) 和同时代重建技术-过后投影 (SIRT-FBP) 用于快速计算机断层扫描 (CT) 成像. SIRT-FBP提供了更好的图像质量,更少的投影,尽管它需要更多的计算时间.

科学领域:

医疗成像医学成像
图像重建图像的重建
计算物理计算物理

背景情况:

计算机断层扫描 (CT) 成像是耗时和数据密集的,特别是用于3D重建.
需要具有有限投影的快速扫描技术来提高效率.

研究的目的:

评估过后投影 (FBP) 和同时代重建技术-过后投影 (SIRT-FBP) 的性能,用于快速CT成像.
为了确定可接受的图像质量所需的最低投影数量.

主要方法:

一个工业X射线CT系统被用来扫描一个幻影,投影数量不同 (360到36).
使用平均平方误差 (MSE),结构相似度指数 (SSIM) 和信号对噪声比 (SNR) 来评估图像质量.
对比的重建方法是FBP和SIRT-FBP.

主要成果:

与FBP (SNR ≤17.20 dB,SSIM ≈0.6) 相比,SIRT-FBP产生了更光滑的图像,SNR (≥20.33 dB) 和SSIM (≈0.9) 较高.
基于MSE,SIRT-FBP显示了更高的准确性,但需要更长的计算时间 (FBP的100s与45s相比).
至少108个投影实现了可接受的图像质量;在72个投影以下发生了显著的退化.

结论:

SIRT-FBP是快速CT成像的可行方法,在减少投影数量时提供优质图像质量.
建议使用这些方法至少进行108个投影,以获得可接受的图像重建.
在不同的重建算法中,图像质量,降噪和计算时间之间存在权衡.

关键词:

和同步代重建技术 (SIRT).计算机断层扫描 (CT) 扫描快速扫描,可以快速扫描.过的背向投影 (FBP) 是一种有限的预测有限的预测.

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