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首页> 外文期刊>IEEE Transactions on Nuclear Science >Evaluation of projection pixel-dependent and pixel-independent scatter correction in SPECT
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Evaluation of projection pixel-dependent and pixel-independent scatter correction in SPECT

机译：SPECT中投影像素相关和像素独立散射校正的评估

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摘要

Dual energy window scatter subtraction methods in single photon emission computed tomography (SPECT) to compensate for the detection of Compton-scattered photons are based on the assumption that the number of scattered photons detected by each projection pixel in the primary energy window is proportional to the number of photons detected in a secondary energy window. The reliability of this assumption was tested using Monte Carlo modeling of photon detection kernels for photon emission by Tc-99m within a water-filled cylinder. By fitting the scatter kernels of a primary energy window to the kernels of a secondary energy window, scatter correction factors were obtained which were dependent on the location of the projection pixel in the detector array. A simultaneous fit of kernels at all detector locations was performed to obtain pixel-independent scatter correction factors. A numerical experiment with noise-free projection data to test the quantitative accuracy of SPECT images reconstructed with pixel-independent and pixel-dependent scatter correction factors is described.
机译：单光子发射计算机断层扫描（SPECT）中的双能量窗口散射减法用于补偿对康普顿散射光子的检测，该假设基于以下假设：在一次能量窗口中每个投影像素检测到的散射光子数量与该能量成正比。在次级能量窗口中检测到的光子数。使用蒙特卡洛（Monte Carlo）建模的光子检测内核对Tc-99m在充满水的圆柱体内进行光子发射的测试，验证了该假设的可靠性。通过将一次能量窗口的散射核与二次能量窗口的核拟合，获得了散射校正因子，其取决于探测器像素在探测器阵列中的位置。在所有检测器位置同时进行内核拟合，以获得独立于像素的散射校正因子。描述了一个无噪声投影数据的数值实验，以测试用独立于像素和独立于像素的散射校正因子重建的SPECT图像的定量精度。

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