Adaptive SPECT
Adaptive SPECT
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DOI：
10.1109/tmi.2007.913241
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发表时间：
2008-06-01
影响因子：
10.6
通讯作者：
Whitaker, Meredith K.
中科院分区：
文献类型：
--
作者：
Barrett, Harrison H.;Furenlid, Lars R.;Whitaker, Meredith K.
自适应成像系统响应于接收到的图像信息而改变其数据采集配置或协议。自适应针孔单光子发射计算机断层摄影（SPECT）系统可以采集初始侦察图像以获得关于放射性示踪剂分布的初步信息，然后调整针孔的配置或尺寸、放大率或投影角度以提高性能。本文简要介绍了两个小动物SPECT系统，允许这种灵活性，然后提出了一个框架，用于评估自适应系统一般，自适应SPECT系统。评价是在线性观测器的检测或估计任务的性能。表达式推导出理想的线性（霍特林）观测器和理想的线性（维纳）估计与自适应成像。给出了性能优值的详细表达式，并讨论了可能的自适应规则。
Adaptive imaging systems alter their data-acquisition configuration or protocol in response to the image information received. An adaptive pinhole single-photon emission computed tomography (SPECT) system might acquire an initial scout image to obtain preliminary information about the radiotracer distribution and then adjust the configuration or sizes of the pinholes, the magnifications, or the projection angles in order to improve performance. This paper briefly describes two small-animal SPECT systems that allow this flexibility and then presents a framework for evaluating adaptive systems in general, and adaptive SPECT systems in particular. The evaluation is in terms of the performance of linear observers on detection or estimation tasks. Expressions are derived for the ideal linear (Hotelling) observer and the ideal linear (Wiener) estimator with adaptive imaging. Detailed expressions for the performance figures of merit are given, and possible adaptation rules are discussed.