Optimization of geometrical calibration in pinhole SPECT
Optimization of geometrical calibration in pinhole SPECT
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DOI：
10.1109/tmi.2004.839367
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发表时间：
2005-02-01
影响因子：
10.6
通讯作者：
Bormans, G
中科院分区：
文献类型：
--
作者：
Bequé, D;Nuyts, J;Bormans, G
以前，我们开发了一种方法来确定针孔相机的采集几何形状。针孔单光子发射计算机断层扫描图像的正确重建需要这些信息。该方法使用由三个点源组成的校准体模，并且它们在视场（FOV）中的位置影响几何估计的准确性。本文提出了两种特定的配置点源的特定位置和方向的FOV的最佳图像重建精度。对于所提出的校准设置，由于校准数据中的噪声而导致的几何估计的不准确性仅导致重建图像中的亚分辨率不准确性。校准方法还使用点源配置的模型，其仅以有限的精度已知。然而，该研究表明，与建议的校准设置，重建图像中的错误是在幻影模型中的错误相媲美。
Previously, we developed a method to determine the acquisition geometry of a pinhole camera. This information is needed for the correct reconstruction of pinhole single photon emission computed tomography images. The method uses a calibration phantom consisting of three point sources and their positions in the field of view (FOV) influence the accuracy of the geometry estimate. This paper proposes two particular configurations of point sources with specific positions and orientations in the FOV for optimal image reconstruction accuracy. For the proposed calibration setups, inaccuracies of the geometry estimate due to noise in the calibration data, only cause subresolution inaccuracies in reconstructed images. The calibration method also uses a model of the point source configuration, which is only known with limited accuracy. The study demonstrates, however, that, with the proposed calibration setups, the error in reconstructed images is comparable to the error in the phantom model.