دورية أكاديمية
Experimental characterisation of the magnetic field correction factor,k->B,for Roos chambers in a parallel MRI-linac.
| العنوان: | Experimental characterisation of the magnetic field correction factor,k->B,for Roos chambers in a parallel MRI-linac. |
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| المؤلفون: | Begg, J, Jelen, U, Keall, P, Liney, G, Holloway, L |
| المصدر: | Physics in Medicine & Biology |
| بيانات النشر: | IOP Sciences ACRF Image X Institute Faculty of Medicine and Health |
| سنة النشر: | 2022 |
| المجموعة: | The University of Sydney: Sydney eScholarship Repository |
| مصطلحات موضوعية: | MRI-linacs, MRgRT, Roos chamber, absorbed dose, magnetic field, 0299 Other Physical Sciences |
| الوصف: | Objective. Reference dosimetry on an MRI-linac requires a chamber specific magnetic field correction factor,kB⃗.This work aims to measure the correction factor for a parallel plate chamber on a parallel MRI-linac. Approach. kB⃗is defined as the ratio of the absorbed dose to water calibration coefficient in the presence of the magnetic field,ND, wB⃗ relative to that under 0 T conditions,ND, w0T. kB⃗ was measured via aND, wtransfer to a field chamber at each magnetic field strength from a chamber with known ND, w and kB⃗. This was achieved on the parallel MRI-linac by moving the measurement set-up between a high magnetic field strength region at the MRI-isocentre and a low magnetic field strength region at the end of the bore whilst maintaining consistent set-up and scatter conditions. Three PTW 34001 Roos chambers were investigated as well as a PTW 30013 Farmer used to validate methodology.Main Results.The beam quality used for the measurements of kB⃗ was TPR20/10 = 0.632. The kB⃗for the PTW Farmer chamber at 1 T on a parallel MRI-linac was 0.993 ± 0.013 (k = 1). The average kB⃗ factor measured for the three Roos chambers on a 1 T parallel MRI-linac was 0.999 ± 0.014 (k = 1).Significance.The results presented are the first measurements of kB⃗ for a Roos chamber on a parallel MRI-linac. The Roos chamber results demonstrate the potential for the chamber as a reference dosimeter in parallel MRI-linacs. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | http://purl.org/au-research/grants/nhmrc/1132471Test; http://purl.org/au-research/grants/nhmrc/1194004Test; https://hdl.handle.net/2123/29895Test |
| DOI: | 10.1088/1361-6560/ac66b8 |
| الإتاحة: | https://doi.org/10.1088/1361-6560/ac66b8Test https://hdl.handle.net/2123/29895Test |
| حقوق: | Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 |
| رقم الانضمام: | edsbas.4F364A29 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/1361-6560/ac66b8 |
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