通过相关测量确定像素化探测器的像素同时探测概率和空间分辨率
Pixels simultaneous detection probabilities and spatial resolution determination of pixelized detectors by means of correlation measurements
摘要：
提出了一种新的方法来估计像素化探测器的像素同时检测概率和空间分辨率，这是基于检测器相邻像素之间的统计相关性的确定。相关性是通过对孤立像素的噪声方差测量和相邻像素之间的差异来确定的。使用两种不同GE Senographe 2000 D乳腺X线摄影装置的图像对该方法进行了验证。像素化探测器已使用X射线沿其整个表面照射。结果表明，像素同时检测概率的估计精度在0.001 - 0.003之间，其中系统误差估计小于0.005。预采样的二维点扩散函数（PSF 0）使用单个高斯近似和两个高斯近似的和来确定。预采样PSF 0的结果表明，单高斯近似是不合适的，两个高斯近似的总和提供了最佳拟合预测存在一个大的（~50%）窄分量。这一事实的另一个证明是A. Badano等人，使用蒙特卡罗模拟确定不同填充因子值的L形均匀分布接受函数的采样二维PSF。探测器的空间分辨率估计使用采样点扩散函数和两个不同的单位有54和58毫公里的值。基于PSF 0估计的预采样调制传递函数的计算表明，现有数据只能使用单个高斯近似来再现，并且两个高斯的和的使用在两个单元的较高频率区域中显示出显著更大的值。
英文摘要：
A novel method to estimate the pixels simultaneous detection probability and the spatial resolution of pixelized detectors is proposed, which is based on the determination of the statistical correlations between detector neighbor pixels. The correlations are determined by means of noise variance measurement for a isolated pixels and the difference between neighbor pixels. The method is validated using images from the two different GE Senographe 2000D mammographic units. The pixelized detector has been irradiated using x-rays along its entire surface. It is shown that the pixel simultaneous detection probabilities can be estimated within accuracy 0.001 - 0.003, where the systematic error is estimated to be smaller than 0.005. The presampled two-dimensional point-spread function (PSF0) is determined using a single Gaussian and a sum of two Gaussian approximations. The obtained results for the presampled PSF0 show that the single Gaussian approximation is not appropriate, and the sum of two Gaussian approximations providing the best fit predicts the existence of a large (~50%) narrow component. Another proof of this fact is the latest simulation study of columnar indirect digital detectors by A. Badano et al. The sampled two-dimensional PSF is determined using Monte Carlo simulation for the L-shape uniform distributed acceptance function for different values of fill factors. The detector spatial resolution is estimated using sampled PSF and has values 54 and 58 mkm for two different units. The calculation of the presampled modulation transfer function based on the PSF0 estimation shows that the existing data can only be reproduced using a single Gaussian approximation and the usage of the sum of two Gaussian show significantly larger values in the higher frequency region for both units.
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