A Backprojection-Based Parameter Estimation Technique for Skew-Slit Collimation.
A Backprojection-Based Parameter Estimation Technique for Skew-Slit Collimation.
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DOI：
10.1109/tns.2009.2019110
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发表时间：
2009
影响因子：
1.8
通讯作者：
Zeng GL
中科院分区：
文献类型：
--
作者：
Piatt JA;Zeng GL
为了估计斜缝单光子发射计算机断层扫描（SPECT）中的几何参数，提出了一种简单的方法，该方法使用单点源和反投影过程。该方法采用一个点源放置在足够远离旋转轴，但在视场中。一个斜缝的几何形状被认为是估计的参数包括两个不透明的平面和多个transaxial狭缝和一个单一的轴向狭缝的位置的焦距。计算机模拟表明，视角无关参数可以唯一估计。进行了三次实验扫描，并准确地估计了视角无关参数。弯曲、下垂和机械移位导致参数根据实验扫描中的视角而变化。这些视角依赖参数估计使用单点源技术，但重建的幻影图像显示出一些误差的视角依赖参数的估计。
To estimate geometric parameters in a skew-slit single photon emission computed tomography (SPECT) scan, a simple method is presented that uses a single point source and a backprojection process. The method employs one point source placed sufficiently far from the axis of rotation but in the field of view. A skew-slit geometry is considered where the estimated parameters include the focal lengths of both opaque planes and the location of multiple transaxial slits and a single axial slit. Computer simulations show that view-angle independent parameters can be uniquely estimated. Three experimental scans were performed, and the view-angle independent parameters were accurately estimated. Tilt, sagging, and mechanical shifts result in parameters that change depending on the view angle in the experimental scans. These view-angle dependent parameters were estimated using the single point-source technique, but reconstructed phantom images showed some error in the estimation of the view-angle dependent parameters.