Crosstalk Reduction Using a Dual Energy Window Scatter Correction in Compton Imaging
Crosstalk Reduction Using a Dual Energy Window Scatter Correction in Compton Imaging
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DOI：
10.3390/s20092453
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发表时间：
2020-05-01
期刊：
影响因子：
3.9
通讯作者：
Tashiro, Mutsumi
中科院分区：
文献类型：
--
作者：
Sakai, Makoto;Parajuli, Raj Kumar;Tashiro, Mutsumi
康普顿相机可以同时检测多个同位素;然而，当执行同时成像时，串扰伪影出现在使用低能量窗口获得的图像上。在传统的单光子发射计算机断层扫描中，使用双能量窗（DEW）减法来减少串扰。本研究旨在评估采用DEW技术来减少使用低能窗口获得的康普顿图像中的串扰伪影的有效性。为此，在这项研究中，我们比较了重建图像使用的光峰窗口或散射窗口通过执行图像相减的基础上的两个图像之间的差异。进行模拟计算，以获得列表数据的康普顿相机使用171和511 keV的点源。在使用这些数据重建的图像中，在使用171 keV光峰能量窗口获得的图像中清楚地观察到串扰伪影。在使用散射窗口（176-186 keV）获得的图像中，仅串扰伪影可见。DEW方法可以消除高能量源对光峰窗口图像的影响，从而提高定量能力。当DEW方法用于实验获得的图像时也观察到这一点。
Compton cameras can simultaneously detect multi-isotopes; however, when simultaneous imaging is performed, crosstalk artifacts appear on the images obtained using a low-energy window. In conventional single-photon emission computed tomography, a dual energy window (DEW) subtraction method is used to reduce crosstalk. This study aimed to evaluate the effectiveness of employing the DEW technique to reduce crosstalk artifacts in Compton images obtained using low-energy windows. To this end, in this study, we compared reconstructed images obtained using either a photo-peak window or a scatter window by performing image subtraction based on the differences between the two images. Simulation calculations were performed to obtain the list data for the Compton camera using a 171 and a 511 keV point source. In the images reconstructed using these data, crosstalk artifacts were clearly observed in the images obtained using a 171 keV photo-peak energy window. In the images obtained using a scatter window (176-186 keV), only crosstalk artifacts were visible. The DEW method could eliminate the influence of high-energy sources on the images obtained with a photo-peak window, thereby improving quantitative capability. This was also observed when the DEW method was used on experimentally obtained images.