Influence of angle-measurement error on pre-sampled MTF and proposal of an optimal technique of angle measurement

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)245-253
Number of pages9
JournalNippon Hoshasen Gijutsu Gakkai zasshi
Volume65
Issue number2
DOIs
Publication statusPublished - 20-02-2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Medicine(all)

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