53rd SSRMP Annual Meeting

Session

Session IV: Dosimetry II - Chair: Dr. Daniel Vetterli

22 Nov 2019, 09:00

Paul Scherrer Institute

Description

Radio-Onkologiezentrum Biel / Inselspital

32. Calibration and verification of dosimeters for high energy electron and photon radiation at METAS 22 MeV accelerator

Dr Peter PEIER (METAS)

22/11/2019, 09:00

Oral

1 Introduction

Therapy dosimeters for high-energy photon and electron radiation have to be verified every four years by METAS. The verification consists of a general test of the equipment, the determination of the reference value of the check-source and, most essentially, the actual calibration of the dosimeter (in following device under test, DuT).
METAS has two...

33. Chemical radiation dosimetry in magnetic fields: Characterization of a Fricke-type chemical detector in 6 MV photon beams and magnetic fields up to 1.42 T

Maria TRACHSEL (Federal Office of Metrology METAS)

22/11/2019, 09:15

Oral

Introduction
The ideal detector for MR guided radiotherapy (MRgRT) applications is not influenced by the presence of a magnetic field during the irradiation. The Fricke-type detector is a chemical dosimetry method in which ferrous iron (Fe$^{2+}$) is oxidized to ferric iron (Fe$^{3+}$) upon irradiation. The increase of the Fe$^{3+}$ concentration is proportional to the absorbed dose and...

19. Quality Assurance of a new accelerator with an integrated MR system

Dr Mariangela ZAMBURLINI (Klinik für Radio-Onkologie, UniversitätsSpital Zürich)

22/11/2019, 09:30

Oral

Introduction
The introduction of the MR-Linac technology poses new challenges on the definition of a suitable machine Quality Assurance (QA) program. In this work, we present our current QA program for the MRIdian MR-Linac (Viewray) and the preliminary results on machine performance.

Materials and Methods
The acceptance of the MRIdian was performed in December 2018. Since then, we...