A PRACTICAL METHOD FOR POSITION-DEPENDENT COMPTON-SCATTER CORRECTION IN SINGLE PHOTON-EMISSION CT
A PRACTICAL METHOD FOR POSITION-DEPENDENT COMPTON-SCATTER CORRECTION IN SINGLE PHOTON-EMISSION CT
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DOI：
10.1109/42.97591
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发表时间：
1991-09-01
影响因子：
10.6
通讯作者：
HASHIMOTO, S
中科院分区：
文献类型：
--
作者：
OGAWA, K;HARATA, Y;HASHIMOTO, S
提出了一种新的实用方法，从 SPECT 平面图像中每个像素处的光峰值窗口获取的光子计数中减去散射光子的计数。 使用两组数据进行减法：一组通过以光峰能量为中心的主窗口获取，另一组通过主窗口两侧的两个子窗口获取。 主窗口中包含的散射光子是根据子窗口获取的计数来估计的，然后从主窗口获取的计数中减去它们。 由于减法是在每个平面图像中的每个像素上执行的，因此所提出的方法有可能比传统方法更精确。 对于圆柱体模型中的三种不同的活动分布，模拟测试给出了从未散射光子重建的活动分布与从校正数据重建的活动分布之间良好的一致性。
A new practical method was proposed to subtract the count of scattered photons from that acquired with a photopeak window at each pixel in each planar image of SPECT. The subtraction is carried out using two sets of data: one set is acquired with a main window centered at photopeak energy and the other is acquired with two subwindows on both sides of the main window. The scattered photons included in the main window are estimated from the counts acquired with the sub-windows and then they are subtracted from the count acquired with the main window. Since the subtraction is performed at each pixel in each planar image, the proposed method has the potential to be more precise than conventional methods. For three different activity distributions in cylinder phantoms, simulation tests gave good agreement between the activity distributions reconstructed from unscattered photons and those from the corrected data.