Thilander-Klang A C, Ackerholm P H, Berlin I C, Bjurstam N G, Mattsson S L, Månsson L G, von Schéele C, Thunberg S J
Department of Radiation Physics, Sahlgrenska University Hospital, Goteborg, Sweden.
Radiology. 1997 May;203(2):348-54. doi: 10.1148/radiology.203.2.9114087.
To evaluate how anode-filter combinations influence image quality in and mean glandular dose to breasts of different thicknesses and compositions.
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.
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%, respectively, of that for Mo-Mo.
Breast thickness is the most important parameter in selection 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.
评估阳极-滤线器组合如何影响不同厚度和成分乳房的图像质量及平均腺体剂量。
对965名女性分别使用钼（Mo）靶阳极和钼滤线器在26 kVp条件下、钼靶阳极和铑（Rh）滤线器在27 kVp条件下、钨（W）靶阳极和铑滤线器在26 kVp条件下进行乳房X线摄影。一侧乳房使用一种阳极-滤线器-管电压组合，另一侧乳房使用另一种组合。计算每个乳房的平均腺体剂量。
钼-钼乳房X线摄影的图像对比度最高。然而，钼-铑和钨-铑组合对腺体组织、胸肌以及皮肤和皮下组织的显示明显（P <.001）优于钼-钼组合。钨-铑和钼-铑组合对腺体组织的平均吸收剂量分别为钼-钼组合的50%和75%。
乳房厚度是选择阳极-滤线器-管电压组合时最重要的参数。与钼-钼组合相比，钼-铑和钨-铑组合均能提供良好的乳腺图像质量，且吸收剂量显著降低。对于乳房厚度60 mm及以下，推荐使用钼-铑-27 kVp组合；对于乳房厚度大于60 mm，推荐使用钨-铑-26 kVp组合。
