Monte Carlo dosimetric characterization of a new high dose rate 169 Yb brachytherapy source and independent verification using a multipoint plastic scintillator detector

Medical Physics
Gabriel FamulariShirin A Enger

Abstract

A prototype 169 Yb source was developed in combination with a dynamic rotating platinum shield system (AIM-Brachy) to deliver intensity modulated brachytherapy (IMBT). The purpose of this study was to evaluate the dosimetric characteristics of the bare/shielded 169 Yb source using Monte Carlo (MC) simulations and perform an independent dose verification using a dosimetry platform based on a multipoint plastic scintillator detector (mPSD). The TG-43U1 dosimetric parameters were calculated for the source model using RapidBrachyMCTPS. Real-time dose rate measurements were performed in a water tank for both the bare/shielded source using a custom remote afterloader. For each dwell position, the dose rate was independently measured by the three scintillators (BCF-10, BCF-12, and BCF-60). For the bare source, dose rate was measured at distances up to 3 cm away from the source over a range of 7 cm along the catheter. For the shielded source, measurements were performed with the mPSD placed at 1 cm from the source at four different azimuthal angles ( 0 ∘ , 9 0 ∘ , 18 0 ∘ , and 27 0 ∘ ). The dosimetric parameters were tabulated for the source model. For the bare source, differences between measured and calc...Continue Reading

References

Aug 1, 1995·Physics in Medicine and Biology·A PiermatteiG Taccini
Oct 19, 2006·Physics in Medicine and Biology·J LambertN Suchowerska
Mar 29, 2007·Medical Physics·Mark J Rivard
Mar 28, 2012·Physics in Medicine and Biology·Pedro AndreoFrancesc Salvat
Oct 13, 2012·Physics in Medicine and Biology·Louis ArchambaultLuc Beaulieu
May 13, 2017·Brachytherapy·François Therriault-ProulxSam Beddar
Sep 26, 2017·Brachytherapy·Jacob Graversen JohansenKari Tanderup
Feb 13, 2018·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Dylan Mann-KrzisnikShirin A Enger
Aug 11, 2018·Physics in Medicine and Biology·Gabriel FamulariShirin A Enger
Mar 21, 2019·Medical Physics·Haydee M Linares RosalesLuc Beaulieu

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