Prof. Dr. Walter Dobretsberger developed Fluidography in Linz, Austria. It was a method which attempted to perform mammography without compression and was introduced by Siemens as the FLUIDOGRAPH in 1964.
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1Comparison of Anode/Filter Combinations in Digital Mammography with Respect to the Average Glandular Dose Uhlenbrock DF, Mertelmeier T
2Xeroradiography is a precursor to digital mammography and CR. It used an amorphous selenium plate as the X-ray receptor with the image being stored as a charge distribution. The imprint on paper was achieved with a toner with the charge on the plate attracting toner particles.