Authors:
T. Lehnert, M. Kissner, H. Korkusuz, U. Voigt-Koop, M. G. Mack, T. J. Vogl; Frankfurt a. Main/DE
DOI:
10.1594/ecr2010/C-2989
Results
Dosimetry:
Using the 1-mm-thick aluminum filter, mean entrance skin dose in all images was 5.9% less (dose level 100%), 11.2% less (dose level 75%), 2.6% less (dose level 50%) and 12.9% less (dose level 25%) than without added filtration. Integration of a 1-mm-thick aluminum filter in combination with a 0.1-mm-thick copper filter led to a still larger decrease of mean entrance skin dose compared to the images obtained without any added filtration, in detail: 26.9% (dose level 100%), 21.1% (dose level 75%), 25.7% (dose level 50%) and 28.4% (dose level 25%).
Image Quality:
Without added filtration, image quality mean score was rated at 6.3 (dose level 100%) (Fig.2a), 6.2 (dose level 75%) (Fig.2b), 5.3 (dose level 50%) and at 4.4 (dose level 25%). An added aluminum filtration induced an image quality mean score of 6.3 (dose level 100%), 6.0 (dose level 75%) (Fig.2c), 5.1 (dose level 50%) and of 4.2 (dose level 25%). Using aluminum/copper filtration, image quality mean score was rated at 6.0 (dose level 100%), 6.1 (dose level 75%) (Fig.2d), 5.0 (dose level 50%) and at 3.8 (dose level 25%). Regardless of the added filtration, a differentiation between dose levels 100% and 75% was possible in 38.9%, between dose levels 75% and 50% in 66.7%, and between dose levels 50% and 25% in 70.0% of the cases (Fig.1, Tab.1).