Dosimetric characterization of a new directional low-dose rate brachytherapy source
Michael G. Mitch, Larry A. DeWerd, Manik Aima, Clifford G. Hammer, Wesley S. Culberson
CivaTech Oncology Inc. (Durham, NC) has developed a novel low-dose rate (LDR) brachytherapy source called the CivaSheet. The source is a planar array of discrete elements (CivaDots") which are directional in nature. This work investigates the repeatability and reproducibility of a primary source strength standard for the CivaDot, and characterizes the CivaDot dose distribution by performing in-phantom measurements and Monte Carlo (MC) simulations. Existing dosimetric formalisms were adapted to accommodate a directional source, and other distinguishing characteristics including the presence of gold shield x-ray fuorescence were addressed in this investigation.