Dijital radyografi sistemlerinde gürültünün konum ve frekans uzayında irdelenmesi

Yıl 2017, Cilt: 21 Sayı: 6, 1360 - 1366, 01.12.2017

Turan Olğar, Ph.d.

https://doi.org/10.16984/saufenbilder.302423

Öz

Dijital radyografi
görüntüsündeki gürültü miktarı, düşük kontrasttaki lezyonların saptanmasına
önemli ölçüde sınırlama getirir. Bu çalışmanın amacı bir dijital radyografi
görüntüsünde, gürültü bileşenlerinin hem konum hem de frekans uzayında
saptanmasıdır. Konum uzayında gürültü analizi bağıl gürültü varyansı analiz
yöntemi ile, frekans uzayında gürültü analizi ise normalize gürültü güç
spektrumunun ölçülmesi aracılığıyla gerçekleştirilmiştir.

Anahtar Kelimeler

Gürültü, Varyans, Gürültü Güç Spektrumu

Investigation of the noise in spatial and frequency domain for digital radiography systems

Öz

Noise amount in digital radiographic image puts a
limitation on detection of low contrast lesions. The aim of this study is to
investigate of the noise component in digital radiographic image in both
spatial and frequency domain. Noise analysis in spatial and frequency domain was
performed by using relative noise variance and noise power spectra measurement
methods, respectively.  

Anahtar Kelimeler

Noise, Variance, Noise Power Spectra

Kaynakça

• 1. M. J. Yaffe and J A Rowlands, “X-ray detectors for digital radiography”, Phys. Med. Biol. Vol.42, pp. 1–39, 1997.
• 2. E. Samei, “Performance of digital radiographic detectors: quantification and assessment methods”, In: Samei E, Flynn MJ, editors. Syllabus: advances in digital radiography-categorical course in diagnostic radiology physics. Oak Brook, IL: Radiological Society of North America. pp. 37-47, 2003.
• 3. M.B. Williams, P.A. Mangiafico, P.U. Simoni, “Noise power spectra of images from digital mammography detectors”, Med Phys, vol. 26, no. 7, pp. 1279-1293, 1999.
• 4. J.T. Bushberg, J.A. Seibert, E.M. Leidholdt, J.M. Boone, The Essential Physics of Medical Imaging. 2nd ed. Philadelphia, Pa: Lippincott Williams & Wilkins, 2001. ISBN: 0-683-30118-7.
• 5. N.W. Marshall, P. Monnin, H. Bosmans, F.O. Bochud, F.R. Verdun, “Image quality assessment in digital mammography: part I. Technical characterization of the systems”, Phys Med Biol, vol. 56, no. 14, pp. 4201-4220, 2011.
• 6. V. Ravaglia, R. Bouwman, K. Young, R. Van Engen and B. Lazzari, “Noise analysis of full field digital mammography systems” Proc. of SPIE vol. 7258 : 72581B, pp 1-11, 2009.
• 7. A. Burgess, “On the noise variance of a digital mammography system”, Med Phys vol. 31, no. 7, pp. 1987-1995, 2004.
• 8. S. Rivetti, N. Lanconelli, R. Campanini, M. Bertolini, G. Borasi, A. Nitrosi, C. Danielli, L. Angelini, S. Maggi, “Comparison of different commercial FFDM units by means of physical characterization and contrast-detail analysis”, Med Phys, vol. 33, no. 11, pp. 4198-4209, 2006.
• 9. S. Rivetti, N. Lanconelli, M. Bertolini, D. Acchiappati, “A new clinical unit for digital radiography based on a thick amorphous selenium plate: physical and psychophysical characterization”, Med Phys, vol. 38, no. 8, pp. 4480-4488, 2011.
• 10. G. Borasi, A. Nitrosi, P. Ferrari, D. Tassoni, “On site evaluation of three flat panel detectors for digital radiography”, Med Phys., vol. 30, no. 7, pp. 1719-1731, 2003.