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Radiology, Vol 128, 211-216, Copyright © 1978 by Radiological Society of North America

ARTICLES

A comparison of mammographic x-ray spectra

TR Fewell and RE Shuping

X-ray spectra produced by mammographic systems are compared to spectra from conventional diagnostic x-ray systems. Some systems use special anode materials and beam filters to produce x-ray spectra more suitable for mammography. The data show that the spectra produced by some systems are unique; in fact, one using molybdenum for both an anode and beam filtering element can produce an x-ray spectrum having more than 80% of the photons below 20 KeV. Using some typical breast phantom materials as attenuators, the primary x-ray spectra incident upon the imaging system were simulated and displayed. Implications of spectral shaping to image quality and patient dose are discussed.




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Copyright © 1978 by the Radiological Society of North America.