ON THE RELATION BETWEEN THE ISRA AND THE EM ALGORITHM FOR POSITRON EMISSION TOMOGRAPHY

被引：104

作者：

DEPIERRO, AR

机构：

[1] Instituto de Matematica Estatisticae, Ciência da Computaçãc, Universidade Estadual de Campinas, Campinas 13081

来源：

IEEE TRANSACTIONS ON MEDICAL IMAGING | 1993年 / 12卷 / 02期

基金：

美国国家卫生研究院;

关键词：

D O I：

10.1109/42.232263

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

The image space reconstruction algorithm (ISRA) was proposed as a modification of the expectation maximization (EM) algorithm based on physical considerations for application in volume emission computed tomography. As a consequence of this modification, ISRA searches for least squares solutions instead of maximizing Poisson likelihoods as the EM algorithm. In this paper, we show that both algorithms may be obtained from a common mathematical framework. We use this fact to extend ISRA for penalized likelihood estimates.

引用

页码：328 / 333

页数：6

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