Model asymmetrical detector response function with a skew normal distribution function in PET

Xiao Jin, J. Miao, S. Ross, C. Stearns
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引用次数: 1

Abstract

In PET image reconstruction, a point-spread-function (PSF) in the form of normal distribution is commonly used to model the detector response function. The PSF becomes asymmetrical off the center of the field-of-view. This effect has been modeled with dual-half normal distribution functions with different standard deviations on the left and right side. This method is subject to unequal noise in the estimated parameters between the two half normal distribution, due to the difference in the number of data points for asymmetrical PSF. In this work, we present a skew normal distribution that includes a standard deviation and a skewness parameter to model the asymmetrical detector response function using both sides of the data profile. The skew normal distribution model noticeably improves the goodness of fit to the raw data over the dual-half normal distribution model by an average of 44% in sum of squared differences, thus giving more reliable estimation of the PSF.
用斜正态分布函数对PET中不对称检测器响应函数进行建模
在PET图像重建中,通常采用正态分布形式的点扩展函数(PSF)来模拟检测器响应函数。PSF在视野中心变得不对称。这种效应已经用双半正态分布函数来建模,在左右两侧有不同的标准差。由于非对称PSF的数据点个数不同,该方法在两个半正态分布之间的估计参数中存在不均匀噪声。在这项工作中,我们提出了一个包含标准偏差和偏度参数的偏态正态分布,用于使用数据剖面的两侧来模拟不对称检测器响应函数。与双半正态分布模型相比,偏态正态分布模型对原始数据的拟合优度平均提高了44%,从而对PSF给出了更可靠的估计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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