title: Dose perturbations by electromagnetic transponders in the proton environment.
abstract: Surgically implanted electromagnetic transponders have been used in external beam radiotherapy for target localization and position monitoring in real time. The effect of transponders on proton therapy dose distributions has not been reported. A Monte Carlo implementation of the transponder geometry is validated against film measurements in a proton SOBP and subsequently used to generate dose distributions for transponders at different positions and orientations in the proton SOBP. The maximum dose deficit is extracted in each case. Dose shadows of up to 60% occur for transponders positioned very near the end of range of the Bragg peak. However, if transponders are positioned further than 5 mm from the end of range, and are not oriented parallel to the beam direction, then the dose deficit can be kept below 10%.
authors: Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA 19104, USA. Derek.Dolney@uphs.upenn.edu
authors: Derek
authors: D
authors: Dolney
authors: James
authors: J
authors: McDonough
authors: Neha
authors: N
authors: Vapiwala
authors: James M
authors: JM
authors: Metz
mesh_terms: D016477:Artifacts; D055615:Electrical Equipment and Supplies; D055590:Electromagnetic Phenomena; D009010:Monte Carlo Method; D061766:Proton Therapy / Q000295:instrumentation*; D011829:Radiation Dosage; D011879:Radiotherapy Dosage