Noise properties of attenuation correction methods for SPECT

E. Soares, H. Barrett, Elizabeth A. Krupinski
{"title":"Noise properties of attenuation correction methods for SPECT","authors":"E. Soares, H. Barrett, Elizabeth A. Krupinski","doi":"10.1109/NSSMIC.1993.373520","DOIUrl":null,"url":null,"abstract":"The authors investigate the noise properties of SPECT images reconstructed with the attenuation correction methods of Bellini, Chang, and Tretiak and Metz. The general model for the image covariance matrix can be described by two terms, the first representing object variability, the second representing the object-dependent quantum noise. The model assumes the reconstruction operation is non-iterative and linear, and the noise in the projection data is nonstationary. All aspects of digital reconstruction are included in the model. The three attenuation correction methods are tested to demonstrate the noise character of SPECT images for a uniformly emitting and attenuating disk. In addition, image quality assessment is performed for the task of detecting a cold signal on a uniformly emitting and attenuating circular background. Comparing the local noise power spectrums for various pixel locations, it is shown that image noise is both globally and locally nonstationary for all three methods, except for a small, uniform region near the center of the disk. It is also seen that the noise properties of all three methods are similar in this region. The method of Tretiak-Metz increases the noise variance at the edge of the disk, whereas it is reduced with the Bellini and Chang methods. Finally, the ideal, nonprewhitening, and region-of-interest observers are shown to be invariant across reconstruction method, however the human observer performs better with the Bellini attenuation correction method.<<ETX>>","PeriodicalId":287813,"journal":{"name":"1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1993-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"12","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NSSMIC.1993.373520","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12

Abstract

The authors investigate the noise properties of SPECT images reconstructed with the attenuation correction methods of Bellini, Chang, and Tretiak and Metz. The general model for the image covariance matrix can be described by two terms, the first representing object variability, the second representing the object-dependent quantum noise. The model assumes the reconstruction operation is non-iterative and linear, and the noise in the projection data is nonstationary. All aspects of digital reconstruction are included in the model. The three attenuation correction methods are tested to demonstrate the noise character of SPECT images for a uniformly emitting and attenuating disk. In addition, image quality assessment is performed for the task of detecting a cold signal on a uniformly emitting and attenuating circular background. Comparing the local noise power spectrums for various pixel locations, it is shown that image noise is both globally and locally nonstationary for all three methods, except for a small, uniform region near the center of the disk. It is also seen that the noise properties of all three methods are similar in this region. The method of Tretiak-Metz increases the noise variance at the edge of the disk, whereas it is reduced with the Bellini and Chang methods. Finally, the ideal, nonprewhitening, and region-of-interest observers are shown to be invariant across reconstruction method, however the human observer performs better with the Bellini attenuation correction method.<>
SPECT衰减校正方法的噪声特性
研究了Bellini、Chang、Tretiak和Metz等衰减校正方法重建的SPECT图像的噪声特性。图像协方差矩阵的一般模型可以用两项来描述,第一项表示对象的可变性,第二项表示对象相关的量子噪声。该模型假设重建操作是非迭代线性的,投影数据中的噪声是非平稳的。数字化重建的各个方面都包含在模型中。对三种衰减校正方法进行了测试,验证了均匀发射衰减磁盘上SPECT图像的噪声特性。此外,对于在均匀发射和衰减的圆形背景上检测冷信号的任务,进行了图像质量评估。比较不同像素位置的局部噪声功率谱,结果表明,除了磁盘中心附近的一个小而均匀的区域外,三种方法的图像噪声都是全局和局部非平稳的。还可以看出,三种方法在该区域的噪声特性是相似的。Tretiak-Metz方法增大了圆盘边缘的噪声方差,而Bellini和Chang方法减小了圆盘边缘的噪声方差。最后,理想的、非预白化的和感兴趣区域的观测器在重建方法中是不变的,而人类观测器在Bellini衰减校正方法中表现更好
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信