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Influence of anode-filter combinations on image quality and radiation dose in 965 women undergoing mammography

Journal article
Authors Anne Thilander-Klang
Per Ackerholm
Isabelita Berlin
Nils Bjurstam
Sören Mattsson
Lars Gunnar Månsson
Christina von Schéele
Stefan Thunberg
Published in Radiology
Volume 203
Pages 348-354
ISSN 0033-8419
Publication year 1997
Published at Institute of Selected Clinical Sciences, Department of Radiation Physics
Institute of Selected Clinical Sciences, Department of Radiology
Pages 348-354
Language en
Keywords Breast radiography, quality assurance, 00.112 Breast radiography, radiation dose, 00.112 Images, quality, 00.112
Subject categories Radiology, Radiological physics, Diagnostic radiology

Abstract

PURPOSE: To evaluate how anode-filter combinations influence image quality in and mean glandular dose to breasts of different thicknesses and compositions. MATERIALS AND METHODS: Mammograms were obtained with a molybdenum (Mo) anode and a Mo filter at 26 kVp, a Mo anode and a rhodium (Rh) filter at 27 kVp, or a tungsten (W) anode and a Rh filter at 26 kVp in 965 women. One anode-filter-tube voltage combination was used in the right breast and another in the left. The mean glandular dose to each breast was calculated. RESULTS: Image contrast was highest in the Mo-Mo mammograms. However, depiction of the glandular tissue, pectoral muscle, and skin and subcutis was significantly (P < .001) better with the Mo-Rh and the W-Rh than with the Mo-Mo combination. The average mean absorbed doses to the glandular tissue for W-Rh and Mo-Rh were 50% and 75%, respectivety, of that for Mo-Mo. CONCLUSION: Breast thickness is the most important parameter in setection of an anode-filter-tube voltage combination. Compared with Mo-Mo, both Mo-Rh and W-Rh gave good image quality of the mammary gland and a considerably lower absorbed dose. Mo-Rh-27 kVp is recommended for breast thicknesses of 60 mm or less; W-Rh-26 kVp, for breast thicknesses of greater than 60 mm.

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