A channelized-hotelling-trace collimator design method based on reconstruction rather than projections
A channelized-hotelling-trace collimator design method based on reconstruction rather than projections
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DOI：
10.1109/tns.2002.803775
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发表时间：
2002-10-01
影响因子：
1.8
通讯作者：
Gullberg, GT
中科院分区：
文献类型：
--
作者：
Zeng, GSL;Gullberg, GT
本文研究了一种新的单光子发射型计算机断层扫描（SPECT）准直器设计技术。在本可行性研究中，准直器孔径是唯一变更的设计变量。其他准直器参数固定为低能量高分辨率（LEHR）设计。该设计是基于一个任务，成像一个小的热病变与均匀的背景。通道化霍特林迹线用于量化特定准直器参数的重建图像中的病变可检测性。这种发展的独特之处在于，图像质量不评估平面投影数据，而是评估重建的断层图像与有序子集期望最大化重建算法。我们的研究结果表明，准直器孔尺寸大于LEHR准直器孔尺寸是病变检测的首选。在SPECT中，最佳准直器设计应取决于重建算法。
In this paper, a new single-photon emission-computed tomography (SPECT) collimator design technique is investigated. In this feasibility study, the collimator hole diameter is the only design variable changed. Other collimator parameters are fixed to a low-energy-high-resolution (LEHR) design. The design is based on a task of imaging a small hot lesion with a uniform background. A channelized hotelling trace is used to quantify the lesion detectability in a reconstructed image for a particular collimator parameter. The unique feature of this development is that the image quality is not evaluated for planar projection data, but rather is evaluated for the reconstructed tomographic image with an ordered-subset expectation-maximization reconstruction algorithm. Our results suggest that a collimator hole size that is larger than the LEHR collimator hole size is preferable for lesion detection. In SPECT, the optimal collimator design should be reconstruction algorithm dependent.