Feasibility of Using Multiple Positions in Leipzig Applicator to Increase Target Coverage

Abstract

Leipzig type applicators were designed for small punctate lesions. However, one of the main disadvantages in this single-dwell applicator is the rapid dose fall-off, which limits the largest area to only 16 mm at 3 mm prescription depth, assuming the edge of the lesion to receive at least 80% central-axis dose. By selectively aligning the stem and employing multiple dwell positions within the stem, the area receiving useful dose may be enlarged.