Patient Compton Scattered Radiation for Monitoring Prostate Radiotherapy with Gold Fiducial Markers: A Simulation Study

• DOI: 10.18178/ijpmbs.6.3.77-82
• Publication Date: 2018-04-09T03:48:40Z
• Authors: Ana Luísa Lopes; Hugo Simões; Carolina Travassos; Paulo Crespo
• Keywords: Fiducial marker

Orthogonal ray imaging is a new low-dose technology under study aimed at assist externalbeam radiotherapy (EBRT) treatments.It consists in detecting radiation scattered the patient and emitted perpendicularly to incident beam.Such can be collected by positioning multi-sliced, collimator-based, 1D detector system parallel beam axis, hence collecting such orthogonal rays, or using pinhole-like positioned above below patient.This potentially useful for on-board imaging, real-time EBRT monitoring.In terms of prostate cancer irradiation, use implanted fiducial markers allows more precise verification gland position relative bony anatomy.The target normally exhibits intra-and interfraction motion induced daily variation rectal bladder filling.In order solve this issue, three gold are inserted into prostate.In present study, capability provided utilizing X-rays escaping patient/fiducial orthogonally respect incoming direction studied GEANT4 simulation.The results allow concluding that signal highly coincident with markers, even situations where these have been deviated as little 3.0 mm.