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Radiology, Vol 200, 659-663, Copyright © 1996 by Radiological Society of North America

ARTICLES

Mammographic phantom studies with synchrotron radiation [published erratum appears in Radiology 1996 Dec;201(3):880]

RE Johnston, D Washburn, E Pisano, C Burns, WC Thomlinson, LD Chapman, F Arfelli, NF Gmur, Z Zhong and D Sayers
Department of Radiology, University of North Carolina, Chapel Hill 27599, USA.

PURPOSE: To explore the potential improvement in image contrast for breast imaging with use of monoenergetic photons. MATERIALS AND METHODS: The x-ray energy available from the National Synchrotron Light Source is from 5 to over 50 keV. A specific energy is selected with a tunable crystal monochromator. The object is scanned with a narrow beam of 80.0 x 0.5 mm. Mammography phantoms were imaged with plate and film as the imaging detectors. Phantom images were obtained at 16-24 keV and compared with images obtained with a conventional mammographic unit. RESULTS: Preliminary findings indicate improved image contrast of the monoenergetic images compared with that obtained from the conventional x-ray source, particularly at 18 keV and below. CONCLUSION: Pilot results are encouraging, and the authors presently continue to explore monoenergetic photon imaging with improved instrumentation, scatter rejection, and use of tissue samples.


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