Browse > Article
http://dx.doi.org/10.5573/ieie.2017.54.3.63

Noise Power Spectrum of Radiography Detectors: II. Measurement Based on the Spectrum Averaging  

Lee, Eunae (Hankuk University of Foreign Studies)
Kim, Dong Sik (Hankuk University of Foreign Studies)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.54, no.3, 2017 , pp. 63-69 More about this Journal
Abstract
In order to observe the noise property of the flat-panel digital radiography detector, measuring the normalized noise power spectrum (NNPS) from acquired x-ray images is conducted. However, the conventional NNPS measurement has an unstable property depending on the acquired image. Averaging the sample periodograms of the input image is usually performed to estimate the NNPS values and increasing the number of samples can provide a reliable NNPS measurement. In this paper, for a finite number of images, two measurement methods, which are based on averaging spectra, such as the image periodogram, are proposed and their performances are analyzed. Using x-ray images acquired from two types of radiography detectors, the two spectrum averaging methods are compared and it is shown that averaging spectra based on the maximal number of combinations of the image pairs provides the best performance in measuring NNPS.
Keywords
Noise power spectrum; periodogram; radiography detector;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 J. A. Rowlands, "The physics of computed radiography," Phys. Med. Biol., vol. 47, no. 23, pp. R123-R166, Dec. 2002.   DOI
2 D. L. Lee, L. K. Cheung, and L. S. Jeromin, "A new digital detector for projection radiography," in Proc. SPIE, Medical Imaging: Phys. Med. Imaging, vol. 2432, pp. 237-249, 1995.
3 J. Beutel, Physics and Psychophysics: Handbook of Medical Imaging, vol. 1, 2000.
4 J. P. Moy, "Signal-to-noise ratio and spatial resolution in x-ray electronic images: Is the MTF a relevant parameter?", Medical Physics, vol. 218, pp. 683-688, 2001.
5 J. T. Dobbins, Ch. 3 Image Quality Metrics for Digital Systems, Handbook of Medical Imaging: Vol. 1. Physics and Psychophysics, SPIE, Washington, 2000.
6 IEC62220-1, Characteristics of Digital X-ray Imaging Devices-Part1: Determination of the Detective Quantum Efficiency, International Electro Technical Commission Report, 2003.
7 A. V. Oppenheim and R. W. Schafer, Discrete-Time Signal Processing, 3rd ed. Upper Saddle River, NJ, USA: Pearson Education, 2009.
8 D. S. Kim, "Noise power spectrum measurements in digital imaging with gain nonuniformity correction," IEEE Trans. Image Processing, vol. 25, no. 8, pp. 3712-3722, Aug. 2016.   DOI
9 D. S. Kim and E. Kim, "Noise power spectrum of the fixed pattern noise in digital radiography detectors," Med. Phys., vol. 43, no. 6, pp. 2765-2773, June 2016.   DOI
10 D. S. Kim and E. Lee, "Noise power spectrum of radiography detectors: I. measurement using the averages of images," Jour. Inst. Electr. Inform. Eng., vol. 53, no. 12, pp. 1892-1889, 2016.