Endo M, Iinuma T A, Tanaka E, Tateno Y
Eur J Nucl Med. 1982;7(3):130-6. doi: 10.1007/BF00256401.
The effects of correction function on image characteristics were studied experimentally for a positron CT device Positologica. Correction functions were obtained by smoothing the Shepp and Logan function by convolution of Gaussian functions. Signal-to-noise ratio (SNR) and spatial resolution were measured for phantoms and related to the magnitude of smoothing. The relation between SNR and spatial resolution is also discussed. Some suggestions are made to indicate how to select correction functions for clinical images. A flow of data processing for Positologica is described together with an outline of its hardware.
针对正电子CT设备Positologica，通过实验研究了校正函数对图像特征的影响。校正函数是通过高斯函数卷积对Shepp-Logan函数进行平滑处理得到的。测量了体模的信噪比（SNR）和空间分辨率，并将其与平滑程度相关联。还讨论了SNR与空间分辨率之间的关系。提出了一些建议，以说明如何为临床图像选择校正函数。描述了Positologica的数据处理流程及其硬件概述。
