Generating arbitrary one-dimensional dose profiles using rotational therapy.

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiotherapy Technology

Background:

• Conformal radiation therapy utilizes intensity-modulated radiotherapy (IMRT), rotational arc therapy, and tomotherapy.
• Volumetric modulated arc therapy (VMAT), an advanced rotational arc therapy, offers variable dose rate and gantry rotation speed for precise dose delivery.

Purpose of the Study:

• To present a theoretical framework for generating arbitrary 1D dose profiles using rotational arc therapy.
• To apply this framework to develop a novel technique for total body irradiation (TBI).

Main Methods:

• Development of a theoretical framework for 1D dose profile generation in rotational arc therapy.
• Application of the framework to design a VMAT-based TBI technique.
• Validation through simulations and experimental measurements.

Main Results:

• The novel VMAT technique can achieve arbitrary 1D dose distributions.
• Uniform dose delivery to the target and reduced dose to critical organs were demonstrated.
• The technique eliminates the need for customized compensators and large treatment rooms.

Conclusions:

• The proposed VMAT framework enables precise 1D dose shaping for TBI.
• This technique offers a more efficient and potentially safer approach to total body irradiation compared to conventional methods.