The complication probability factor: a method for selection of radiation treatment plans

Area of Science:

• Radiation Oncology
• Medical Physics
• Radiotherapy Planning

Background:

• Selecting optimal radiation therapy plans with subtle differences is challenging.
• Radiation-related complications are a concern in treatment planning.
• Integral dose metrics are used to assess treatment plans.

Purpose of the Study:

• To introduce a complication probability factor (CPF) for quantifying and comparing radiation treatment plans.
• To demonstrate the utility of the CPF method in analyzing pelvic tumor irradiation plans.

Main Methods:

• A complication probability factor (CPF), a variant of integral dose, was developed.
• The CPF quantifies the weighted volume of irradiated normal tissue.
• Treatment plans using parallel opposed, 360 deg rotational, and four-field techniques with X-ray beams (4-45 MV) for pelvic tumors were analyzed.

Main Results:

• The CPF method effectively quantifies the relative merits of different radiation treatment plans.
• Complex radiation delivery techniques (e.g., rotational) showed substantial improvements in dose distribution.
• Higher beam energies (e.g., 45 MV) were found to be relatively less advantageous for dose distribution in this context.

Conclusions:

• The complication probability factor (CPF) is a valuable tool for radiation treatment plan selection.
• Advanced radiation delivery techniques can significantly enhance dose distribution and potentially reduce complications.
• Beam energy selection requires careful consideration, as higher energies may not always yield superior dose distributions.