Skretting Arne
The Interventional Centre, Oslo University Hospital, Oslo, Norway.
Radiat Prot Dosimetry. 2010 Apr-May;139(1-3):195-8. doi: 10.1093/rpd/ncq019. Epub 2010 Feb 17.
When PET image volumes are reconstructed with ordered subset expectation-maximization (OSEM) and subjected to filtration with a 3D Gaussian filter the effective spatial resolution is a function of both the intrinsic scanner resolution and the user-selectable spatial width of the filter. A method was developed to derive the effective spatial resolution from such volumes obtained after acquisitions with a line source on a Siemens Biograph 64 PET/CT scanner. Assuming Gaussian distributions, the full widths at half maximum (FWHM) were derived from probit plots of cumulative spatial distributions across the line source. The effective FWHM values were also used to estimate the FWHM of the intrinsic resolution by extrapolation to a zero filter width.
当正电子发射断层扫描（PET）图像体积通过有序子集期望最大化（OSEM）重建并用三维高斯滤波器进行滤波时，有效空间分辨率是扫描仪固有分辨率和用户可选择的滤波器空间宽度的函数。开发了一种方法，用于从西门子Biograph 64 PET/CT扫描仪上使用线源采集后获得的此类体积中推导有效空间分辨率。假设为高斯分布，半高宽（FWHM）从线源上累积空间分布的概率图中得出。有效FWHM值还用于通过外推到零滤波器宽度来估计固有分辨率的FWHM。
