Characterization of a Commercial Ionization Chamber Array With Scanned Proton Beams for Applications in MRI‐Guided Proton Therapy
Benjamin Gebauer, Sebastian Gantz, Daniela Kunath, Aswin Hoffmann, Jörg Pawelke, Felix Horst
TL;DR
This paper evaluates a commercial ionization chamber array for use in MRI-guided proton therapy, confirming its suitability for dosimetric measurements in magnetic fields.
Contribution
The study experimentally characterizes the PTW Octavius 1500 in a magnetic field for MRI-guided proton therapy applications.
Findings
The dose rate response was linear up to 80Gy/min.
The effective measurement depth was 8.1±0.2mm.
The device provided reasonable results in a 0.32T in-beam MR scanner.
Abstract
The integration of MRI‐guidance and proton therapy is a current research topic. Proton therapy with the patient being placed inside an in‐beam MR scanner would require the presence of its static magnetic (B0) field to be taken into account in dose calculation and treatment planning. Therefore, dosimetric tools are needed to characterize dose distributions in presence of the B0 field of the MR scanner. Furthermore, patient‐specific quality assurance (QA) and treatment plan verification measurements should also be performed within the magnetic field. In this work, the PTW Octavius 1500 ionization chamber array was characterized experimentally and tested for its suitability as a dosimetric tool for beam characterization and QA in MRI‐guided proton therapy. The dose rate response, response homogeneity and effective measurement depth of the detector were determined in experiments with…
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Taxonomy
TopicsRadiation Therapy and Dosimetry · Advanced Radiotherapy Techniques · Radiation Detection and Scintillator Technologies