Measurement of the noise power spectrum in digital x-ray detectors

Richard Aufrichtig; Yu Su; Yu Cheng; Paul R. Granfors

doi:10.1117/12.430934

28 June 2001 Measurement of the noise power spectrum in digital x-ray detectors

Richard Aufrichtig, Yu Su, Yu Cheng, Paul R. Granfors

Proceedings Volume 4320, Medical Imaging 2001: Physics of Medical Imaging; (2001) https://doi.org/10.1117/12.430934
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

The noise power spectrum, NPS, is a key imaging property of a detector and one of the principle quantities needed to compute the detective quantum efficiency. NPS is measured by computing the Fourier transform of flat field images. Different measurement methods are investigated and evaluated with images obtained from an amorphous silicon flat panel x-ray imaging detector. First, the influence of fixed pattern structures is minimized by appropriate background corrections. For a given data set the effect of using different types of windowing functions is studied. Also different window sizes and amounts of overlap between windows are evaluated and compared to theoretical predictions. Results indicate that measurement error is minimized when applying overlapping Hanning windows on the raw data. Finally it is shown that radial averaging is a useful method of reducing the two-dimensional noise power spectrum to one dimension.

Citation Download Citation

Richard Aufrichtig, Yu Su, Yu Cheng, and Paul R. Granfors "Measurement of the noise power spectrum in digital x-ray detectors", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); https://doi.org/10.1117/12.430934

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