Performance of a multi-axis ionization chamber array in a 1.5 T magnetic field

At the UMC Utrecht a prototype MR-linac has been installed. The system consists of an 8 MV Elekta linear accelerator and a 1.5 T Philips MRI system. This paper investigates the performance of the IC PROFILER™, a multi-axis ionization chamber array, in a 1.5 T magnetic field. The influence of the mag...

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Bibliographic Details
Published in:Physics in medicine & biology 2014-04, Vol.59 (7), p.1845-1855
Main Authors: Smit, K, Kok, J G M, Lagendijk, J J W, Raaymakers, B W
Format: Article
Language:English
Subjects:
2D ionization chamber array
dosimetry
Feasibility Studies
IC PROFILER
Linear Models
Magnetic Fields
MR-linac
Particle Accelerators
Radiometry - instrumentation
radiotherapy
Reproducibility of Results
Time Factors
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Summary:At the UMC Utrecht a prototype MR-linac has been installed. The system consists of an 8 MV Elekta linear accelerator and a 1.5 T Philips MRI system. This paper investigates the performance of the IC PROFILER™, a multi-axis ionization chamber array, in a 1.5 T magnetic field. The influence of the magnetic field on the IC PROFILER™ reproducibility, dose response linearity, pulse rate frequency dependence, power to electronics, panel orientation and ionization chamber shape were investigated. The linearity, reproducibility, pulse rate frequency dependence, panel orientation and ionization chamber shape are unaffected by the magnetic field. When the measurements results are normalized to the centre reference chamber, the measurements can commence unaltered. Orientation of the ionization chambers in the magnetic field is of importance, therefore caution must be taken when comparing or normalizing results from several different axes. IC PROFILER™ dose profiles were compared with film dose profiles obtained simultaneously in the MR-linac. Deviation between the film and the IC PROFILER™ data was caused by the noise in the film, indicating correct performance of the IC PROFILER™ in the transverse 1.5 T magnetic field.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/59/7/1845