Dept. of Stat., Univ. Coll., Dublin.
IEEE Trans Med Imaging. 1993;12(2):167-72. doi: 10.1109/42.232245.
At present, the choice of bandwidth in emission computed tomography (ECT) reconstruction is done by subjective means. The authors develop an automated objective selection technique for linear reconstruction algorithms such as filtered backprojection. The approach is based on the method of unbiased risk estimation. A set of 2-D validation studies using computer simulated and physical phantom data from the Hoffman et al. (1990) brain phantom are carried out. These 2-D studies incorporate measured corrections for object attenuation and lack of uniformity in detector sensitivity. It is found that the unbiased risk approach works very well. Over a range of count rates and brain slice source distributions, the root mean square (RMS) error of the fully automated reconstruction, with the data-dependent choice of bandwidth, is around 5% greater than the RMS error for the reconstruction with an ideal choice of the bandwidth.
目前，发射型计算机断层成像（ECT）重建中带宽的选择是通过主观手段完成的。作者为诸如滤波反投影等线性重建算法开发了一种自动客观选择技术。该方法基于无偏风险估计方法。使用霍夫曼等人（1990 年）脑部模型的计算机模拟和物理模型数据进行了一组二维验证研究。这些二维研究纳入了对物体衰减和探测器灵敏度不均匀性的测量校正。结果发现，无偏风险方法效果很好。在一系列计数率和脑切片源分布范围内，具有数据相关带宽选择的全自动重建的均方根（RMS）误差比具有理想带宽选择的重建的 RMS 误差大约大 5%。
