Physical evaluation of prototype high-performance anti-scatter grids: potential for improved digital radiographic image quality
Physical evaluation of prototype high-performance anti-scatter grids: potential for improved digital radiographic image quality
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DOI：
10.1088/0031-9155/54/2/n02
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发表时间：
2009-01-21
影响因子：
3.5
通讯作者：
Schueler, Beth A.
中科院分区：
文献类型：
--
作者：
Fetterly, Kenneth A.;Schueler, Beth A.
屏幕胶片 X 射线系统的网格评估通常包括对相反对比度改进因子和巴基因子的独立测量。然而，在评估数字成像环境中的网格性能时，这些指标都不合适。对于数字射线照相系统，抗散射网格的好处可以通过网格提供的量子信噪比改进因子 (K(SNR)) 来充分表征。这项工作的目的是测量设计用于数字射线照相系统的原型网格的 KSNR。原型网格具有 5 毫米高的铅隔片、纤维间隙材料、线速 N = 25 和 36 cm(-1) 以及比率 r 分别 = 15 和 21。测量了网格的主透射率和散射透射率，并在 10-50 cm 的体模厚度范围内评估了 KSNR。为了进行比较，还报告了类似构造的 N44r15 和 N80r15 网格的 KSNR。原型网格的 KSNR 范围为 10 厘米体模的 1.4 到 50 厘米体模的 2.4。对于最厚的体模，原型网格的信噪比改善系数分别比 N44r15 和 N80r15 网格高 18-83%。
Grid evaluation for a screen-film x-ray system has typically included independent measurement of the opposing contrast improvement factor and Bucky factor. Neither of these metrics, however, is appropriate when assessing grid performance in a digital imaging environment. For digital radiographic systems, the benefit of an anti-scatter grid is well characterized by the quantum signal-to-noise ratio improvement factor (K(SNR)) provided by the grid. The purpose of this work was to measure KSNR of prototype grids designed for use with digital radiographic systems. The prototype grids had 5mm tall lead septa, fiber interspace material, line rate N = 25 and 36 cm(-1) and ratio r = 15 and 21, respectively. The primary and scatter transmission properties of the grids were measured, and KSNR was evaluated over a phantom thickness range of 10-50 cm. To provide a comparison, the KSNR of similarly constructed N44r15 and N80r15 grids is also reported. KSNR of the prototype grids ranged from 1.4 for the 10 cm phantom to 2.4 for the 50 cm phantom. For the thickest phantom, the SNR improvement factor of the prototype grids was 18-83% higher than that of the N44r15 and N80r15 grids, respectively.