Influence of Angle-measurement Error on Pre-sampled MTF and Proposal of an Optimal Technique of Angle Measurement

Higashide Ryo, Ichikawa Katsuhiro, Kunitomo Hiroshi, Ohashi Kazuya, Kawano Makoto

doi:10.6009/jjrt.65.245

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Other Title

角度計測誤差がｐｒｅｓａｍｐｌｅｄ　ＭＴＦへ及ぼす影響の検証と角度計測の最適手法の提案
カクドケイソクゴサガ presampled MTF エオヨボスエイキョウノケンショウトカクドケイソクノサイテキシュホウノテイアン

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Description

The presampled modulation transfer function (MTF) is recognized as the established metric for characterizing the resolution performance of a digital imaging system. In the past, the three general approaches for assessing the presampled MTF were using the angulated slit, angulated edge, and angulated square-wave test pattern all of which are tilted slightly against the column direction of the detector. In all methods, it is important to determine the exact angle of the respective test devices. In this study, we examined the influence of angle-measurement error in three test devices and the optimal technique of angle measurement. These results demonstrated that the influences of angle-measurement error in each method were equal. We also investigated three angle-measurement techniques using trace of objects, Hough transfer, and comparative observation of synthetic profiles. These results suggested that the technique using synthetic profiles was the most optimal technique in the angle measurement. Through use of the technique, angle-measurement error was completely overcome. This technique will contribute to improved accuracy of presampled MTF measurements.

Journal

Japanese Journal of Radiological Technology

Japanese Journal of Radiological Technology 65 (2), 245-253, 2009

Japanese Society of Radiological Technology

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