A method to measure the presampling MTF using a novel edge test device and algorithm

Tatsuya Yamazaki; Makoto Nokita; Shinsuke Hayashida; Hitoshi Inoue

doi:10.1117/12.534051

6 May 2004 A method to measure the presampling MTF using a novel edge test device and algorithm

Tatsuya Yamazaki, Makoto Nokita, Shinsuke Hayashida, Hitoshi Inoue

Proceedings Volume 5368, Medical Imaging 2004: Physics of Medical Imaging; (2004) https://doi.org/10.1117/12.534051
Event: Medical Imaging 2004, 2004, San Diego, California, United States

Abstract

We have developed a novel method to measure the presampling modulation transfer function (MTF) in digital radiography systems using a novel edge device and algorithm. It can simultaneously measure the presampling MTFs in horizontally and vertically by utilizing its four edges. Calculation algorithm is composed of six steps, which are detection of edge, determination of angle, differentiation, composition of line spread function (LSF), fast Fourier transform (FFT) and sinc correction, respectively. Verification of the accuracy was conducted comparing with the established slit method. The repeatability of the measurement and the dose dependence was also examined. The measured MTF of edge device was coincident to that of slit within 0.02 up to the Nyquist frequency (3.125 cycles/mm). The repeatability was within 0.002 up to the Nyquist frequency. It is also confirmed that the result is not affected by the alignment error against the x-ray axis. In conclusion, an accurate and feasible method to measure the presampling MTF was established using a novel edge test device and algorithm.

Citation Download Citation

Tatsuya Yamazaki, Makoto Nokita, Shinsuke Hayashida, and Hitoshi Inoue "A method to measure the presampling MTF using a novel edge test device and algorithm", Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); https://doi.org/10.1117/12.534051

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