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Updated: Jan 26, 2026
07:31
Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
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Pretreatment Dose Verification in Volumetric Modulated Arc Therapy Using Liquid Ionization Chamber
Nitin R Kakade1,2, Rajesh Kumar1, Sunil Dutt Sharma1,2
1Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Anushaktinagar, Mumbai, Maharashtra, India.
Journal of Medical Physics
|April 16, 2019
Summary
Liquid ionization chambers (LICs) are practical for verifying doses in advanced radiotherapy, including volumetric modulated arc therapy (VMAT). This study found LICs comparable to traditional chambers for pretreatment dose verification in VMAT.
Area of Science:
- Medical Physics
- Radiation Oncology
- Dosimetry
Background:
- Advanced radiotherapy techniques like volumetric modulated arc therapy (VMAT) require precise dose verification.
- Traditional dosimetry methods may face challenges with the complexity of VMAT dose distributions.
Purpose of the Study:
- To assess the feasibility of using a liquid ionization chamber (LIC) for pretreatment dose verification in VMAT.
- To compare the performance of LIC with a conventional air-filled thimble ionization chamber for VMAT dose checks.
Main Methods:
- Investigated dosimetric characteristics of LIC including repeatability, linearity, and angular dependence in 6 MV X-ray beams.
- Cross-calibrated LIC against a 0.125 cc air-filled thimble ionization chamber.
- Performed pretreatment dose verification of VMAT plans using both LIC and the thimble chamber, comparing results with Treatment Planning System (TPS) calculations.
Main Results:
- Relative percentage differences between TPS calculated and measured doses were within ±1.57% for LIC.
- The 0.125 cc air-filled thimble ionization chamber showed differences within ±2.21%.
Conclusions:
- The liquid ionization chamber (LIC) demonstrated comparable accuracy to a conventional ionization chamber for VMAT pretreatment dose verification.
- LIC is a viable and effective dosimeter for ensuring accuracy in advanced radiotherapy techniques like VMAT.
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