Physical measures of image quality in photostimulable phosphor radiographic systems
Physical measures of image quality in photostimulable phosphor radiographic systems
复制标题
光激励磷光放射线照相系统中图像质量的物理测量
DOI：
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
M. Flynn
中科院分区：
文献类型：
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作者：
E. Samei;M. Flynn
本研究的目的是严格评估和比较两种现代数字光激励磷光体 (PSP) 射线照相系统的固有分辨率、噪声和信噪比传输特性。两个商业 PSP 系统通过相同的方法进行了评估。使用标准分辨率和高分辨率屏幕在三种光束质量下进行测量。使用边缘方法测量系统的预采样调制传递函数（MTF）。噪声功率谱（NPS）通过均匀曝光的射线照片的二维傅立叶分析来确定。频率相关的探测量子效率 (DQE) 是通过 MTF 和 NPS 测量以及输入信噪比获得的，由 X 射线光谱计算模型确定，该模型根据曝光和半值层测量进行了验证。系统的物理性能非常相似；使用像素大小为 0.1 毫米和标准分辨率屏幕，在 115 kVp 下估计两个系统的 DQE 为 0.24，空间频率为 2.5 周期/毫米，MTF 为 0.2。与使用相同像素尺寸和光束质量的 GP-25 屏幕相比，HD 屏幕提供了改进的 MTF，但对噪声产生了不利影响。
The purpose of this study was to critically assess and compare the intrinsic resolution, noise, and signal-to-noise transfer characteristics of two modern digital photostimulable phosphor (PSP) radiographic systems. Two commercial PSP systems were evaluated by identical methodologies. Measurements were made at three beam qualities using standard-resolution and high-resolution screens. The presampled modulation transfer functions (MTF) of the systems were measured using an edge method. The noise power spectra (NPS) were determined by 2D Fourier analysis of uniformly exposed radiographs. The frequency-dependent detective quantum efficiencies (DQE) were obtained from the MTF and NPS measures and the input signal-to-noise ratio, determined by a computational model for x-ray spectrum which was verified against exposure and half-value-layer measurements. The physical performance of the systems were very similar; a DQE of 0.24 and a spatial frequency of 2.5 cycles/mm at 0.2 MTF were estimated for both systems at 115 kVp using a pixel size of 0.1 mm and standard-resolution screens. The HD screen provided improved MTF with an adverse effect on noise as compared to the GP-25 screen using the same pixel size and beam quality.
影响因子：
3.8
作者：
DOBBINS, JT;ERGUN, DL;CLARK, DC
通讯作者：
CLARK, DC