Hosoba M, Wani H, Toyama H, Murata H, Tanaka E
J Nucl Med. 1986 Jul;27(7):1184-91.
To perform accurate in vivo quantitation by single photon emission computed tomography, we have developed a new method for detecting body contours for the correction of tissue attenuation. Our method can rapidly derive the best fit contours throughout the body by using the measured axial length of the patient body and Fourier filtering the detected contours which are defined by a unique bit-plane algorithm. We have also evaluated the effects of the body contours on the reconstructed images by using various attenuation correction techniques including a precorrection method (Sorenson, 1974), a postcorrection method (Chang, 1978), a weighted backprojection method, and a radial post correction method (Tanaka, 1983 and 1984). Counts in the specified region-of-interest in phantom images reconstructed by the radial postcorrection, weighted backprojection, and postcorrection methods were more strongly affected by inaccurately detected contours than were counts derived from images reconstructed by the precorrection method.
为了通过单光子发射计算机断层扫描进行准确的体内定量分析，我们开发了一种检测身体轮廓以校正组织衰减的新方法。我们的方法可以通过使用测量的患者身体轴向长度，并对由独特的位平面算法定义的检测到的轮廓进行傅里叶滤波，快速得出全身的最佳拟合轮廓。我们还通过使用各种衰减校正技术，包括预校正方法（索伦森，1974年）、后校正方法（张，1978年）、加权反投影方法和径向后校正方法（田中，1983年和1984年），评估了身体轮廓对重建图像的影响。与通过预校正方法重建的图像得出的计数相比，通过径向后校正、加权反投影和后校正方法重建的体模图像中指定感兴趣区域的计数受轮廓检测不准确的影响更大。
