The Australian MRI-Linac Program: measuring profiles and PDD in a horizontal beam

Authors

Jarrad Begg, University of New South Wales
Armia George, Liverpool and Macarthur Cancer Therapy Centres
Sarah Alnaghy, University of WollongongFollow
Trent Causer, University of WollongongFollow
T Alharthi, University of Sydney
L Glaubes, University of Sydney
Bosheng Dong, University of WollongongFollow
Gary Goozee, Liverpool and Macarthur Cancer Therapy Centres
Gary P. Liney, University of WollongongFollow
Lois C. Holloway, University of WollongongFollow
Paul J. Keall, University of Sydney

RIS ID

113130

Publication Details

Begg, J., George, A., Alnaghy, S. J., Causer, T., Alharthi, T., Glaubes, L., Dong, B., Goozee, G., Liney, G., Holloway, L. & Keall, P. (2017). The Australian MRI-Linac Program: measuring profiles and PDD in a horizontal beam. Journal of Physics: Conference Series, 777 (1), 012035-1-012035-4.

Abstract

The Australian MRI-Linac consists of a fixed horizontal photon beam combined with a MRI. Commissioning required PDD and profiles measured in a horizontal set-up using a combination of water tank measurements and gafchromic film. To validate the methodology, measurements were performed comparing PDD and profiles measured with the gantry angle set to 0 and 90° on a conventional linac. Results showed agreement to within 2.0% for PDD measured using both film and the water tank at gantry 90° relative to PDD acquired using gantry 0°. Profiles acquired using a water tank at both gantry 0 and 90° showed agreement in FWHM to within 1 mm. The agreement for both PDD and profiles measured at gantry 90° relative to gantry 0° curves indicates that the methodology described can be used to acquire the necessary beam data for horizontal beam lines and in particular, commissioning the Australian MRI-linac.