Magnification Mammography: A Low-Dose Technique

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Abstract
Image quality and radiation exposures of a mammographic technique using direct radiographic magnification at 2 .times. with a microfocal spot X-ray tube and a fast, double screen-film system were compared to those of conventional contact mammography with a rare-earth screen and Mo target tube. The magnification technique yields improved detection of microcalcifications and comparable visualization of soft-tissue details, with a large reduction in radiation exposure. This technique has demonstrated the feasibility of carrying out high-quality mammography with an entrance dose of 1.35 .times. 10-3 Gy (135 mrad) for the average breast.