King M A, Miller T R, Doherty P W, Schwinger R B
Department of Nuclear Medicine, University of Massachusetts Medical School, Worcester 01605.
Nucl Med Commun. 1988 Jan;9(1):3-13.
Stationary and nonstationary finite-impulse-response (FIR) implementations of the count-dependent Metz filter were investigated in this study. Filter size was observed to be an important variable controlling image quality. For Metz filtering of 128 X 128 pixel images at least a 15 X 15 term FIR filter was deemed necessary. By using an algorithm which selected between a set of preformed FIR filters based on pixel count, a nonstationary FIR implementation of the Metz filter was developed which required very little increase in execution time to stationary filtering. In a limited comparison of 'tumor' detection with stationary and nonstationary FIR filtering all of the Metz filtering techniques showed a significant improvement in detection when compared to the unprocessed images. However, no significant difference was observed between the stationary and nonstationary Metz filtering techniques. Thus, for Metz filters optimized solely on the basis of count, nonstationary FIR filtering does not seem to offer an advantage when compared to stationary filtering.
本研究对与计数相关的梅茨滤波器的固定和非固定有限脉冲响应（FIR）实现方式进行了研究。研究发现滤波器大小是控制图像质量的一个重要变量。对于128×128像素图像的梅茨滤波，至少一个15×15项的FIR滤波器被认为是必要的。通过使用一种基于像素计数在一组预制FIR滤波器之间进行选择的算法，开发出了一种梅茨滤波器的非固定FIR实现方式，与固定滤波相比，其执行时间增加很少。在对“肿瘤”检测进行的固定和非固定FIR滤波的有限比较中，与未处理图像相比，所有梅茨滤波技术在检测方面都有显著改善。然而，在固定和非固定梅茨滤波技术之间未观察到显著差异。因此，对于仅基于计数进行优化的梅茨滤波器，与固定滤波相比，非固定FIR滤波似乎没有优势。
