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Dynamic conical conformal radiotherapy using a C-arm-mounted accelerator: dose distribution and clinical application
Keiichi Nakagawa1, Yukimasa Aoki, Masao Tago
1Department of Radiology, University of Tokyo Hospital, Tokyo, Japan. nakagawa-rad@umin.ac.jp
Summary
Dynamic conical conformal radiation therapy (Dyconic CRT) overcomes dose distribution anisotropy in rotational conformal radiotherapy (RCRT). This novel technique achieves isotropic dose falloff, improving radiation therapy precision.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Rotational conformal radiotherapy (RCRT) faces challenges with anisotropic dose distributions.
- Anisotropy can lead to suboptimal radiation targeting and potential damage to healthy tissues.
Purpose of the Study:
- To address and solve the anisotropy issue in RCRT dose distributions.
- To introduce and evaluate a novel C-arm-mounted accelerator technique.
Main Methods:
- Developed Dynamic conical conformal radiation therapy (Dyconic CRT) using a C-arm-mounted accelerator.
- Implemented simultaneous gantry rotation and C-arm movement for dynamic conical irradiation.
- Integrated continuous multileaf collimator motion with the conical technique.
- Measured dose distributions in phantoms and presented patient data.
Main Results:
- Dyconic CRT allows precise delivery of noncoplanar beams without patient table rotation.
- Achieved three-dimensionally isotropic dose falloff, significantly improving dose conformity.
- Utilized wedge filters to compensate for any remaining sagittal dose inhomogeneity.
Conclusions:
- Dyconic CRT effectively overcomes the limitations of conventional RCRT dose distributions.
- The technique offers enhanced precision and conformity in radiation therapy planning and delivery.