Laser alignment system for helical pinhole SPECT
Laser alignment system for helical pinhole SPECT
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DOI：
10.1109/tns.2004.829749
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发表时间：
2004-06-01
影响因子：
1.8
通讯作者：
Jaszczak, RJ
中科院分区：
文献类型：
--
作者：
Metzler, SD;Greer, KL;Jaszczak, RJ
针孔单光子发射计算机层析成像(SPECT)是一种放大几何结构，对机械对准非常敏感。由于放大率的原因，孔径的微小机械位移导致投影数据的较大变化。螺旋轨道可用于针孔SPECT，以提高投影数据的完整性。这是通过使用研究扫描仪在直线工作台产生轴向运动时提供旋转来实现的。综合效应是一个螺旋轨道。然而，重建质量可能受到线性工作台与扫描仪旋转轴的对准的限制。我们已经开发了一种用于对准直线工作台的激光系统。给出了系统的设计方案，并对其对准精度进行了评估。给出了螺旋针孔SPECT的实验数据。
Pinhole single photon emission computed tomography (SPECT) is very sensitive to mechanical alignment because it is a magnifying geometry. Because of magnification, small mechanical shifts of the aperture result in a large change in the projection data. Helical orbits may be used for pinhole SPECT to improve the completeness of the projection data. This has been done by using a research scanner to provide rotation while a linear stage produces axial movement. The combined effect is a helical orbit. However, reconstruction quality may be limited by the alignment of the linear stage with the axis of rotation of the scanner. We have developed a laser system for aligning the linear stage. We present the system design and estimate the accuracy of its alignment. Experimental helical pinhole SPECT data are presented.