Webb S, Flower M A, Ott R J, Leach M O
Phys Med Biol. 1983 Sep;28(9):1045-56. doi: 10.1088/0031-9155/28/9/004.
Transverse section tomograms of experimental phantoms and patients have been obtained using a GE 400T camera and a filtered back-projection reconstruction technique. These tomograms have been compared with the corresponding sections reconstructed from the same tomographic projection data, but using iterative algorithms with correction for photon attenuation. The comparison assesses the importance of including a correction for attenuation as well as demonstrating how closely a simple geometric attenuation correction, applied to the filtered back-projection reconstruction method, approximates to a more accurate correction incorporated in the computation of line integrals during iterative reconstruction. A comparison is also made between the behaviour of reconstruction algorithms with simulated projection data and real data in terms of convergence properties, and some shortcomings arising from simulation are noted.
使用GE 400T相机和滤波反投影重建技术获取了实验模型和患者的横断面断层图像。已将这些断层图像与从相同断层投影数据重建的相应切片进行比较，但使用了对光子衰减进行校正的迭代算法。该比较评估了包含衰减校正的重要性，同时展示了应用于滤波反投影重建方法的简单几何衰减校正与迭代重建过程中线积分计算中纳入的更精确校正的接近程度。还就收敛特性对具有模拟投影数据和真实数据的重建算法的行为进行了比较，并指出了模拟产生的一些缺点。
