Consequences of air around an ionization chamber: Are existing solid phantoms suitable for reference dosimetry on an MR-linac?

Purpose: A protocol for reference dosimetry for the MR-linac is under development. The 1.5 T magnetic field changes the mean path length of electrons in an air-filled ionization chamber but has little effect on the electron trajectories in a surrounding phantom. It is therefore necessary to correct...

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Veröffentlicht in:	Medical physics (Lancaster) 2016-07, Vol.43 (7), p.3961-3968
Hauptverfasser:	Hackett, S. L., van Asselen, B., Wolthaus, J. W. H., Kok, J. G. M., Woodings, S. J., Lagendijk, J. J. W., Raaymakers, B. W.
Format:	Artikel
Sprache:	eng
Schlagworte:	60 APPLIED LIFE SCIENCES Air biomedical equipment DOSIMETRY Dosimetry/exposure assessment ELECTRONS Equipment Design Field size Gas‐filled counters: ionization chambers, proportional, and avalanche counters ionisation chambers ionization chamber IONIZATION CHAMBERS LINEAR ACCELERATORS Magnetic field measurements Magnetic fields Magnetic Resonance Imaging - instrumentation Magnetic Resonance Imaging - methods Measurement of nuclear or x‐radiation MR‐linac Particle Accelerators - instrumentation PHANTOMS Phantoms, Imaging plastic phantom RADIATION PROTECTION AND DOSIMETRY Radiometry - instrumentation Radiometry - methods Radiotherapy, Image-Guided - instrumentation Radiotherapy, Image-Guided - methods Rotation measurement Scintigraphy Secondary emission Time measurement Tubes for determining the presence, intensity, density or energy of radiation or particles WATER Water vapor with scintillation detectors
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