Related Experiment Video
Updated: Aug 8, 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
13.1K
Comparison of individual and composite field analysis using array detector for Intensity Modulated Radiotherapy dose
Sathiyan Saminathan1, Varatharaj Chandraraj1, C H Sridhar2
1Department of Radiation Physics, Kidwai Memorial Institute of Oncology, Bangalore 560029, India.
Summary
This study compared measured and calculated radiation doses for Intensity Modulated Radiotherapy brain tumor plans. Results show good agreement, suggesting composite field analysis may suffice for efficiency.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Intensity Modulated Radiotherapy (IMRT) is a complex radiation therapy technique.
- Accurate dose verification is crucial for patient safety and treatment efficacy.
Purpose of the Study:
- To compare measured and calculated planar dose distributions for IMRT plans.
- To evaluate individual and composite field dose distributions.
Main Methods:
- Twenty brain tumor patients' IMRT plans were analyzed.
- Dose distributions were calculated using the Eclipse treatment planning system (TPS).
- Measurements were performed using a Matrixx device in a solid water phantom.
Main Results:
- High gamma pixel match percentages (95-98%) were observed for both individual and composite fields.
- Individual field analysis showed 95-98% gamma match for 39% of fields and 98% for 61%.
- Composite field analysis demonstrated 95-98% gamma match for 5 patients and 98% for 12 patients.
Conclusions:
- Measured and calculated IMRT dose distributions showed good agreement.
- Composite field analysis may be a time-efficient alternative for dose distribution analysis with array detectors.
