Walters T E, Simon W, Chesler D A, Correia J A
J Comput Assist Tomogr. 1981 Feb;5(1):89-94. doi: 10.1097/00004728-198102000-00016.
A method of computing tomographic images from single photon radionuclide emission data is presented. The method takes into account attenuation of gamma rays inside the source and makes use of an iterative technique, based on the difference between the projection data obtained from the source and computed projections, called reprojections, from successive reconstructions of the sources. The method has been tested both by computer simulations and reconstruction of plastic phantoms imaged with 99mTc radionuclides. Substantial improvement in reconstruction accuracy over algorithms uncorrected for internal attenuation is demonstrated. Since the technique is iterative, it can be used with a variety of reconstruction algorithms or combined with other first approximation techniques of attenuation correction.
本文提出了一种从单光子放射性核素发射数据计算断层图像的方法。该方法考虑了源内部伽马射线的衰减，并利用一种迭代技术，该技术基于从源获得的投影数据与从源的连续重建中计算得到的投影（称为重投影）之间的差异。该方法已通过计算机模拟和用99mTc放射性核素成像的塑料模型的重建进行了测试。结果表明，与未校正内部衰减的算法相比，重建精度有了显著提高。由于该技术是迭代的，它可以与各种重建算法一起使用，也可以与其他衰减校正的一阶近似技术相结合。
