A simple method for evaluating image quality of screen-film system using a high-performance digital camera

Naotoshi Fujita; Asumi Yamazaki; Katsuhiro Ichikawa; Yoshie Kodera

doi:10.1117/12.811490

13 March 2009 A simple method for evaluating image quality of screen-film system using a high-performance digital camera

Naotoshi Fujita, Asumi Yamazaki, Katsuhiro Ichikawa, Yoshie Kodera

Author Affiliations +

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72584Z (2009) https://doi.org/10.1117/12.811490
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Screen-film systems are used in mammography even now. Therefore, it is important to measure their physical properties such as modulation transfer function (MTF) or noise power spectrum (NPS). The MTF and NPS of screen-film systems are mostly measured by using a microdensitometer. However, since microdensitometers are not commonly used in general hospitals, it is difficult to carry out these measurements regularly. In the past, Ichikawa et al. have measured and evaluated the physical properties of medical liquid crystal displays by using a high-performance digital camera. By this method, the physical properties of screen-film systems can be measured easily without using a microdensitometer. Therefore, we have proposed a simple method for measuring the MTF and NPS of screen-film systems by using a high-performance digital camera. The proposed method is based on the edge method (for evaluating MTF) and the one-dimensional fast Fourier transform (FFT) method (for evaluating NPS), respectively. As a result, the MTF and NPS evaluated by using the high-performance digital camera approximately corresponded with those evaluated by using a microdensitometer. It is possible to substitute the calculation of MTF and NPS by using a high-performance digital camera for that by using a microdensitometer. Further, this method also simplifies the evaluation of the physical properties of screen-film systems.

Citation Download Citation

Naotoshi Fujita, Asumi Yamazaki, Katsuhiro Ichikawa, and Yoshie Kodera "A simple method for evaluating image quality of screen-film system using a high-performance digital camera", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72584Z (13 March 2009); https://doi.org/10.1117/12.811490

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