A simple method for measuring MTF in direct digital intraoral radiography

Oral Surgery, Oral Medicine, Oral Pathology Pub Date : 1994-12-01 DOI:10.1016/0030-4220(94)90099-X

William D. McDavid PhD (Professor) , Ulf Welander DDS, PhD (Professor and Chairman) , Gerard C.H. Sanderink DDS, PhD (Professor) , S.Brent Dove DDS, MS (Assistant Professor) , Gunilla Tronje DDS, PhD (Professor)

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引用次数: 12

Abstract

Conventional methods for measuring the modulation transfer function require the exposure of a narrow slit or straight edge followed by computationally intense data analysis. An alternative method applicable to digital systems uses the standard deviation of gray levels within different frequency regions of a bar pattern. To verify that this method gave reliable results, measurements performed for two systems for intraoral radiography with the use of this method have been compared with modulation transfer function values calculated from Fourier transformations of line spread functions measured for the two systems. The almost identical results confirm the consistency of both sets of modulation transfer function measurements and demonstrate the utility of the bar pattern method for performing rapid measurements.

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直接数字口内x线摄影测量MTF的简单方法

测量调制传递函数的传统方法需要暴露窄缝或直边，然后进行计算强度大的数据分析。另一种适用于数字系统的方法是使用条形图的不同频率区域内灰度的标准偏差。为了验证该方法给出了可靠的结果，使用该方法对两个系统进行的口内x线摄影测量与调制传递函数值进行了比较，这些值是由为这两个系统测量的线扩展函数的傅里叶变换计算得到的。几乎相同的结果证实了两组调制传递函数测量的一致性，并证明了棒状图方法用于执行快速测量的实用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Oral Surgery, Oral Medicine, Oral Pathology

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