Modeling of the Response of Ionization Chambers in Radiotherapy Fields with Dynamic Intensity Modulation

Medical Physics in the Baltic States 2009: Proceedings of the 7th International Conference on Medical Physics 2009
Sandija Plaude, Sergejs Popovs, Artūrs Meijers, A. Millers, Jurijs Dehtjars

Ionization chamber (IC) is the most common and trusted radiation detector in Radiotherapy (RT) dosimetry. However, due to its finite size detector volume have an impact on point dose easurements especially in a penumbra and regions of high dose gradients inside Intensity odulated Radiotherapy (IMRT) fields. The aim of this work is to make a comparison of measured and modeled point doses in the case of dynamic radiotherapy using IC`s of different active volumes, to evaluate magnitude of the chamber volume effect on the discrepancy between the calculated and the measured dose.

Keywords
Point dose measurements, ionization chamber, IMRT
Hyperlink
http://alephfiles.rtu.lv/TUA01/000030515_e.pdf

Plaude, S., Popovs, S., Meijers, A., Millers, A., Dehtjars, J. Modeling of the Response of Ionization Chambers in Radiotherapy Fields with Dynamic Intensity Modulation. In: Medical Physics in the Baltic States 2009: Proceedings of the 7th International Conference on Medical Physics, Lithuania, Kaunas, 8-10 October, 2009. Kaunas: Kaunas University of Technology, 2009, pp.52-55. ISSN 1822-5721.

Publication language
English (en)