A system for intensity modulated dose plan verification based on an experimental pencil beam kernel obtained by...

Area of Science:

• Medical Physics
• Radiation Oncology

Background:

• Intensity modulated radiation therapy (IMRT) use is increasing globally.
• Patient-specific quality assurance (QA) is crucial but can consume valuable machine time.
• Efficient QA tools are needed to optimize radiation therapy workflows.

Purpose of the Study:

• To develop an independent method for patient-specific IMRT QA.
• To validate a novel experimental kernel generation technique.
• To reduce reliance on machine time for routine QA procedures.

Main Methods:

• Developed a new system for experimental kernel generation using a deconvolution procedure with Hankel transform.
• Utilized a pencil beam kernel approach for independent dose calculation.
• Validated calculations against measurements using radiographic film, diode arrays, and ionization chambers in polystyrene and water.

Main Results:

• The developed method accurately calculates IMRT dose distributions and treatment times.
• Experimental kernels were obtained independently of commercial treatment planning systems (TPS).
• Measurements demonstrated high accuracy when comparing calculated and measured doses.

Conclusions:

• The novel technique provides an accurate and independent method for IMRT QA.
• This approach can serve as a valuable double-check algorithm for IMRT procedures.
• The system offers potential for improving the efficiency of radiation therapy QA.