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首页> 外文期刊>Computer Methods and Programs in Biomedicine: An International Journal Devoted to the Development, Implementation and Exchange of Computing Methodology and Software Systems in Biomedical Research and Medical Practice >Evaluating iterative algebraic algorithms in terms of convergence and image quality for cone beam CT
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Evaluating iterative algebraic algorithms in terms of convergence and image quality for cone beam CT

机译：根据锥束CT的收敛性和图像质量评估迭代代数算法

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Cone beam computed tomography (CBCT) enables a volumetric image reconstruction from a set of 2D projection data. It plays an important role in image guided radiation therapy (IGRT). However, it is desirable to lower the patient radiation dose while maintaining good quality tomographic reconstructions. Hence, methods are needed even when the data is undersampled or there are limited projections. Iterative algorithms such as ART, SART and OS-SART are known to perform well under such circumstances. The performance of ART, SART and OS-SART is here studied based on a range of norm measurements (RMS reconstruction error, RMS projection error, and the L1 norm and L2 norm of the image error). Image quality measurements for uniformity and noise are also introduced. Since image quality often degrades as iterative algorithms converge, a simple function is used to trade off convergence with image quality. Investigations are performed using simulated and experimental data. ? 2012 Elsevier Ireland Ltd.
机译：锥形束计算机断层扫描（CBCT）可从一组2D投影数据中重建体积图像。它在影像引导放射治疗（IGRT）中起着重要作用。然而，期望在维持高质量的断层摄影重建的同时降低患者的辐射剂量。因此，即使在数据采样不足或预测有限的情况下，也需要使用方法。已知诸如ART，SART和OS-SART的迭代算法在这种情况下表现良好。在此，根据一系列规范测量值（RMS重构误差，RMS投影误差以及图像误差的L1规范和L2规范）研究ART，SART和OS-SART的性能。还介绍了用于均匀性和噪声的图像质量测量。由于图像质量通常会随着迭代算法的收敛而降低，因此使用一个简单的函数来权衡收敛与图像质量。使用模拟和实验数据进行调查。 ？ 2012爱思唯尔爱尔兰有限公司

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