SU‐E‐T‐768: Treatment Time Nomogram for Strut‐Based Accelerated Partial Breast Applicators

TL;DRAbstract

Purpose: The purpose of this work was to generate a tabular nomogram of treatment times for strut‐based APBI applicators. The nomogram is intended to provide guidance and a quality assurance check for clinics establishing new treatment techniques or transitioning from balloon‐based applicators. Methods: A retrospective analysis was conducted of 486 patients receiving APBI using strut‐based applicators at three separate institutions. Strut‐based applicators are composed of a central channel surrounded by 6 close‐range (“mini”), 6 mid‐range, 8, or 10 peripheral channels. Patient data was organized based on applicator size (a surrogate of treatment volume) and number of organs at risk. Three organs at risk categories were determined based on the proximity of the device to the patient's skin and/or chest wall (0, 1, or 2 OARs). The proximity criterion was defined as being < 5 mm from the cavity wall/peripheral struts. A tabular nomogram of treatment time (based on nominal 10 Ci source s

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