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Storage phosphor and film-screen mammography: performance with different mammographic techniques

Journal article
Authors Susanne Kheddache
Anne Thilander-Klang
Birgitta Lanhede
Lars Gunnar Månsson
Nils Bjurstam
Per Ackerholm
Lena Björneld
Published in European Radiology
Volume 9
Issue 4
Pages 591-597
ISSN 0938-7994
Publication year 1999
Published at Institute of Selected Clinical Sciences, Department of Radiation Physics
Institute of Selected Clinical Sciences, Department of Radiology
Pages 591-597
Language en
Keywords Digital radiography Storage phosphors Mammography Anthropomorphic phantom
Subject categories Radiological physics, Diagnostic radiology

Abstract

The aim of this study was to compare the image quality of storage phosphor plates with that in screen-film radiograms in mammography. Two anode/filter combinations were also compared ± Mo/ Mo and W/Rh. Storage phosphor plates, generation IIIN (Fuji, Tokyo, Japan) and a conventional screenfilm system (Kodak, Rochester, N.Y.) were evaluated using two mammographic units. One unit had a 0.6-mm focal spot, an anode/filter combination of Mo/Mo and no grid (A-Mo); the other had a 0.3-mm focal spot, a grid, and two possible combinations of anode/filter Mo/Mo (B-Mo) and W/Rh (B-W). Simulated tumours and microcalcifications were randomly positioned in an anthropomorphic breast phantom (RMI model 165, no. 210±009, Radiation Measurements Inc., Middleton, Wisconsin). The image quality was evaluated using a modified version of receiver operating characteristics analysis. Five observers evaluated 300 films and 300 hard copy images each. Radiation doses were also determined. The image Quality of the conventional screen-film images was significantly better than that for the storage phosphor plate mammograms. The B-Mo system rated best, for the detection of both tumours and microcalcifications, although it was not significantly different from the B-W system. Systems B-Mo and B-W rated significantly better than the A-Mo system for both image receptors studied. The mean absorbed dose was twice as high for the B-Mo system as for the A-Mo and B-W systems for both conventional and digital technique. The mammograms produced with the screen-film combination gave a significantly better detectability than the storage phosphor plates used in this study. Substantial dose reduction could be achieved using an anode/filter combination of W/Rh instead of Mo/Mo with no significant loss of information in the images.

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