Fast reconstruction of digital tomosynthesis using on-board images
Fast reconstruction of digital tomosynthesis using on-board images
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DOI：
10.1118/1.2896077
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发表时间：
2008-05-01
期刊：
影响因子：
3.8
通讯作者：
Yin, Fang-Fang
中科院分区：
文献类型：
--
作者：
Yan, Hui;Godfrey, Devon J.;Yin, Fang-Fang
数字断层合成（Digital Tomosynthesis，简称TOM）是一种从有限扫描角度采集的二维X射线投影重建伪三维（3D）体积图像的方法。与常用于3D图像引导放射治疗的锥形束计算机断层扫描相比，MRI需要更少的成像时间和剂量。成功实施快速目标定位的重建过程需要在严格的临床时间限制内（通常在2分钟内）完成。为了实现这一目标，需要大幅度提高重建效率。在这项研究中，Feldkamp，Davis和Kress提出的算法的基础上的重建过程中实现的图形硬件加速的目的。针对体模和真实的患者病例测试了新型重建实现的性能。在不影响图像质量的情况下，重建的效率平均提高了13倍。通过对重建算法的加速，在1.5 min内完成了数据预处理、重建和DICOM转换的整个图像生成过程，最终满足了临床上的在线靶点定位要求。(c)2008年美国医学物理学家协会。
Digital tomosynthesis (DTS) is a method to reconstruct pseudo three-dimensional (3D) volume images from two-dimensional x-ray projections acquired over limited scan angles. Compared with cone-beam computed tomography, which is frequently used for 3D image guided radiation therapy, DTS requires less imaging time and dose. Successful implementation of DTS for fast target localization requires the reconstruction process to be accomplished within tight clinical time constraints (usually within 2 min). To achieve this goal, substantial improvement of reconstruction efficiency is necessary. In this study, a reconstruction process based upon the algorithm proposed by Feldkamp, Davis, and Kress was implemented on graphics hardware for the purpose of acceleration. The performance of the novel reconstruction implementation was tested for phantom and real patient cases. The efficiency of DTS reconstruction was improved by a factor of 13 on average, without compromising image quality. With acceleration of the reconstruction algorithm, the whole DTS generation process including data preprocessing, reconstruction, and DICOM conversion is accomplished within 1.5 min, which ultimately meets clinical requirement for on-line target localization. (c) 2008 American Association of Physicists in Medicine.