A Comparison of Mammographic X-Ray Spectra

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Abstract
X-ray spectra produced by mammographic systems were compared to spectra from conventional cancer diagnostic X-ray systems. Some systems use special anode materials and beam filters to produce X-ray spectra more suitable for mammography. The spectra produced by some systems are unique. One using Mo for 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 on the imaging system were simulated and displayed. Implications of spectral shaping to image quality and patient dose are discussed.

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