SPECT仿真系统的噪声特性

1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference Pub Date : 1993-10-31 DOI:10.1109/NSSMIC.1993.373548

M. Bélanger, A. B. Dobrzeniecki, J. Yanch

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引用次数: 4

摘要

研究了蒙特卡罗SPECT仿真包生成的合成图像的噪声特性。Sim-SPECT通过模拟蒙特卡罗方法生成单平面投影，但使用定向光子克隆技术来模拟层析成像采集。研究了单平面投影和层析成像的统计噪声特征，以评估定向克隆算法的潜在噪声失真。均方根(EMS)和噪声功率谱是用来表征噪声的两种数学方法。利用光谱平均技术估计NPS。合成的Sim-SPECT和实验数据(包括单平面和层析成像)是使用相同尺寸和均匀活性的幻影获得的。

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Noise characteristics of a SPECT simulation system

The noise characteristics of synthetic images generated by a Monte Carlo SPECT simulation package (Sim-SPECT) were examined. Sim-SPECT generates single planer projections via analog Monte Carlo methods but uses a directional photon cloning technique to simulate tomographic acquisition. Statistical noise characteristics were investigated in both single planar projection and tomographic acquisitions, the latter to assess the potential noise distortion of the directional cloning algorithm. The root-mean-square (EMS) and the noise power spectrum were two mathematical measures used to characterise the noise. NPS was estimated using spectral averaging techniques. Synthetic Sim-SPECT and experimental data (both single planar and tomographic acquisitions) were obtained using phantoms of identical dimensions and uniform activity.<>

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1993 IEEE Conference Record Nuclear Science Symposium and Medical Imaging Conference

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