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首页> 外文会议>Physics of Medical Imaging pt.3; Progress in Biomedical Optics and Imaging; vol.8 no.29; Proceedings of SPIE-The International Society for Optical Engineering; vol.6510 pt.3 >Validation of software for QC assessment of MTF and NPS
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Validation of software for QC assessment of MTF and NPS

机译：对MTF和NPS进行质量控制评估的软件验证

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摘要

Modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) are widely accepted measures of digital radiographic system performance. However the implementation of these measurement methodologies has been limited to a handful of researchers using an assortment of techniques. A prototype edge tool and easy-to-use software program, which can generate MTF, NPS, and DQE results quickly and easily in the field, have been developed. The edge tool consists of 1mm or 250 μ thick tungsten with two polished edges. Edge and NPS data were obtained and analyzed by 3 investigators using three analysis methods: Method A, the software under development for this report; Method B, code available on the web site of one of the investigators [Saunders and Samei, Med. Phys. 33, 308-319 (2006)]; and Method C, code developed by two other of the investigators [Samei and Flynn, Med Phy. 30, 608-622, (2003)]. In all cases the differences between the results using Method B and Method A were less than 1%. The differences between Method A and Method C were larger, up to 5.26%. NPS were calculated using Method A and B. The results were very close, with average errors less than 2.5% for exposures of 27.3, 9.3, and 2.7 μGy. Analysis of data for a 10 cm misalignment shows no significant error for either the 250n or lmm edge. The method developed gives results that correlate closely with results obtained from established methods. The software is easy-to-use and flexible in its application. The Edge Tool developed has the necessary precision to accurately determine the MTF values of the system. Further validation of NPS and DQE is ongoing.
机译：调制传递函数（MTF），噪声功率谱（NPS）和探测量子效率（DQE）是数字射线照相系统性能的公认度量。但是，这些测量方法的实施仅限于使用多种技术的少数研究人员。已经开发出原型边缘工具和易于使用的软件程序，可以在现场快速，轻松地生成MTF，NPS和DQE结果。边缘工具由1mm或250μ厚的钨和两个抛光的边缘组成。边缘和NPS数据由3名调查人员使用三种分析方法获得并进行了分析：方法A，本报告中正在开发的软件；方法B，其中一位研究人员的网站上提供的代码[Saunders and Samei，Med。物理33，308-319（2006）]；和方法C，由另外两个研究人员开发的代码[Samei和Flynn，Med Phy。 30，608-622，（2003）]。在所有情况下，使用方法B和方法A的结果之间的差异均小于1％。方法A和方法C之间的差异较大，最高为5.26％。使用方法A和B计算NPS。结果非常接近，对于27.3、9.3和2.7μGy的暴露，平均误差小于2.5％。对10厘米未对准的数据分析显示，对于250n或1mm边缘，均无明显误差。开发的方法得出的结果与从既定方法获得的结果紧密相关。该软件易于使用且应用灵活。开发的Edge Tool具有必要的精度，可以准确确定系统的MTF值。 NPS和DQE的进一步验证正在进行中。

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