Investigation of imaging properties for submillimeter rectangular pinholes.
Investigation of imaging properties for submillimeter rectangular pinholes.
复制标题
亚毫米矩形针孔成像特性的研究。
DOI：
10.1118/1.4935200
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发表时间：
2015
期刊：
影响因子：
3.8
通讯作者：
Metzler,ScottD
中科院分区：
文献类型：
--
作者：
Xia,Dan;Moore,StephenC;Park,Mi-Ae;Cervo,Morgan;Metzler,ScottD
最近，一种具有矩形孔径和矩形视场（FOV）的多针孔准直器被提出用于SPECT成像，因为它可以有效地将投影平铺到探测器上，并且横向和轴向方向的FOV变得可分离。本研究的目的是调查的图像特性的矩形孔径针孔与亚毫米孔径sizes.MethodsIn这项工作中，作者进行了灵敏度和FOV实验的18个重复的原型插入制造的铂/铱（Pt/Ir）合金与亚毫米方形孔径。已对这些插入物进行sinqθ拟合以获得实验灵敏度。对于视场测量，作者提出了一个新的公式来计算投影强度的洪水图像上的探测器，考虑半影效应。通过拟合此公式的测量投影数据，作者得到的接受angle.ResultsThe平均值（标准差）的拟合灵敏度指数平方和有效的边缘长度分别为10.8（1.8）和0.38毫米（0.02毫米），这是接近的值，7.84和0.396毫米，从蒙特卡罗计算获得的参数设计的插入。在视场测量中，横向和轴向接受度的平均值（标准差）分别为35.0°（1.2°）和30.5°（1.6°），与设计值（34.3°和29.9°）基本一致。
PurposeRecently, a multipinhole collimator with inserts that have both rectangular apertures and rectangular fields of view (FOVs) has been proposed for SPECT imaging since it can tile the projection onto the detector efficiently and the FOVs in transverse and axial directions become separable. The purpose of this study is to investigate the image properties of rectangular‐aperture pinholes with submillimeter apertures sizes.MethodsIn this work, the authors have conducted sensitivity and FOV experiments for 18 replicates of a prototype insert fabricated in platinum/iridium (Pt/Ir) alloy with submillimeter square‐apertures. A sinqθfit to the experimental sensitivity has been performed for these inserts. For the FOV measurement, the authors have proposed a new formula to calculate the projection intensity of a flood image on the detector, taking into account the penumbra effect. By fitting this formula to the measured projection data, the authors obtained the acceptance angles.ResultsThe mean (standard deviation) of fitted sensitivity exponentsqand effective edge lengthswewere, respectively, 10.8 (1.8) and 0.38 mm (0.02 mm), which were close to the values, 7.84 and 0.396 mm, obtained from Monte Carlo calculations using the parameters of the designed inserts. For the FOV measurement, the mean (standard deviation) of the transverse and axial acceptances were 35.0° (1.2°) and 30.5° (1.6°), which are in good agreement with the designed values (34.3° and 29.9°).ConclusionsThese results showed that the physical properties of the fabricated inserts with submillimeter aperture size matched our design well.