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IMRT clinical implementation: prostate and pelvic node irradiation using Helios and a 120-leaf multileaf collimator
C H Clark1, C D Mubata, C A Meehan
1Joint Department of Physics, The Royal Marsden NHS Trust, Fulham Road, London SW3 6JJ, United Kingdom. catharine.clark@icr.ac.uk
Journal of Applied Clinical Medical Physics
|October 18, 2002
Summary
Dynamic intensity modulated radiation therapy (IMRT) using advanced multileaf collimators (MLC) has been successfully implemented for prostate and pelvic node treatment. This advanced IMRT ensures accurate radiation delivery, improving patient outcomes in dose escalation protocols.
Area of Science:
- Medical Physics
- Radiation Oncology
- Clinical Engineering
Background:
- Dynamic intensity modulated radiation therapy (IMRT) offers precise radiation delivery.
- The Varian 120-leaf Millennium multileaf collimator (MLC) is a key technology for advanced IMRT.
- Implementation of dynamic IMRT requires rigorous commissioning and quality assurance.
Purpose of the Study:
- To describe the procedures for implementing dynamic IMRT with a Varian 120-leaf Millennium MLC.
- To detail the commissioning process, including Helios software aspects.
- To verify the accuracy and safety of dynamic dose delivery for patient treatment.
Main Methods:
- Commissioning of the Helios system, including MLC transmission and dosimetric separation measurements.
- Verification of dynamic dose delivery using phantoms and in-vivo measurements.
- Planning and treatment of five test patients for prostate and pelvic node irradiation.
Main Results:
- MLC transmission measurements were 1.7% (6 MV) and 1.8% (10 MV).
- Dosimetric separation values were 1.05 mm (6 MV) and 1.65 mm (10 MV).
- Measured doses in the prostate and nodes were within 2.0% and 3.0% of calculated doses, respectively.
Conclusions:
- The Helios-optimized dynamic IMRT system is commissioned and verified for clinical use.
- Accurate dose delivery for prostate and pelvic node irradiation has been achieved.
- The clinic has initiated treatment for patients using this advanced IMRT technique in a dose escalation protocol.