Kimiaei S, Larsson S A, Jacobsson H
Department of Hospital Physics, Karolinska Hospital, Stockholm, Sweden.
J Nucl Med. 1996 Aug;37(8):1417-21.
This paper evaluates the design of a new planar-concave collimator with nonuniform response that better matches the body shape than conventional collimators.
The collimator properties are evaluated and assessed by means of both a stimulation program and an experimental test using a prototype planar-concave collimator.
The results, for points located 150 mm from the axis of rotation, demonstrate that the ratio of radial and tangential spatial resolution in SPECT with the new collimator decreased by 40%, as compared to SPECT with a standard collimator. In planar scintigraphy, the spatial resolution improved correspondingly from 10.9 mm (FWHM) to 7.8 mm in lateral areas of the body.
The new collimator reduces nonisotropic blurring in SPECT in addition to improving spatial resolution in both planar scintigraphy and in SPECT.
本文评估了一种新型平面凹面准直器的设计，该准直器具有不均匀响应，比传统准直器更能匹配身体形状。
通过模拟程序和使用原型平面凹面准直器的实验测试来评估和评定准直器的性能。
对于距离旋转轴150毫米处的点，结果表明，与使用标准准直器的单光子发射计算机断层扫描（SPECT）相比，使用新型准直器的SPECT中径向和切向空间分辨率的比率降低了40%。在平面闪烁显像中，身体侧面区域的空间分辨率相应地从10.9毫米（半高宽）提高到7.8毫米。
新型准直器除了提高平面闪烁显像和SPECT中的空间分辨率外，还减少了SPECT中的非各向同性模糊。
