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Updated: Nov 21, 2025

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities
Published on: February 20, 2021
Influence of beam quality on reference dosimetry correction factors in magnetic resonance guided radiation therapy
Stefan Pojtinger1,2, Marcel Nachbar2, Ralf-Peter Kapsch1
1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
Abstract:
Correction factors for reference dosimetry in magnetic resonance (MR) imaging-guided radiation therapy ( ) are often determined in setups that combine a conventional 6 MV linac with an electromagnet. This study investigated whether results based on these measurements were applicable for a 7 MV MR-linac using Monte Carlo simulations. For a Farmer-type ionization chamber, was assessed for different tissue-phantom ratios ( ). differed by between (6 MV linac) and (7 MV MR-linac) at . The agreement was best in an orientation in which the secondary electrons were deflected to the stem of the ionization chamber.
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