会聚狭缝-板准直器的几何响应函数。
The geometric response function for convergent slit-slat collimators.
作者信息
Li Yusheng, Oldendick James, Ordonez Caesar E, Chang Wei
机构信息
Department of Diagnostic Radiology, Rush University Medical Center, Chicago, IL 60612, USA.
出版信息
Phys Med Biol. 2009 Mar 21;54(6):1469-82. doi: 10.1088/0031-9155/54/6/006. Epub 2009 Feb 13.
Abstract
We have derived an analytic geometric transfer function (GTF) for a convergent slit-slat collimator that treats the parallel slit-slat collimator as a special case. The effective point spread function (EPSF) is then derived from the GTF through the Fourier transform. The results of these derivations give an accurate description of the complete geometric response for a slit-slat collimator that includes the effects of the shape and orientation of the slit and slats. We have also derived exact and approximate sensitivity formulae and spatial resolution formulae using the EPSF.
摘要
我们推导了一种用于会聚狭缝-板准直器的解析几何传递函数（GTF），并将平行狭缝-板准直器视为其特殊情况。然后通过傅里叶变换从GTF导出有效点扩散函数（EPSF）。这些推导结果精确描述了狭缝-板准直器的完整几何响应，其中包括狭缝和板的形状及方向的影响。我们还使用EPSF推导了精确和近似的灵敏度公式以及空间分辨率公式。
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