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A new single-arc Volumetric Modulated Arc Therapy (VMAT) framework optimizes dual-layer multi-leaf collimators (DLMLC), achieving superior dosimetry compared to single-layer MLC (SLMLC) plans. This advancement offers improved dose reduction for organs at risk.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Technology

Background:

  • Dual-layer multi-leaf collimators (DLMLC) offer a balance of resolution, low leakage, and fabricability.
  • Existing Volumetric Modulated Arc Therapy (VMAT) algorithms struggle with DLMLC, requiring more arcs for comparable dosimetry to single-layer MLC (SLMLC).
  • There is a need for optimized VMAT strategies tailored to DLMLC capabilities.

Purpose of the Study:

  • To develop a novel single-arc VMAT optimization framework specifically for DLMLC.
  • To leverage the unique characteristics of DLMLC for improved treatment planning.
  • To compare the dosimetric performance of DLMLC VMAT against SLMLC VMAT.

Main Methods:

  • Formulated a Direct Aperture Optimization (DAO) for single-arc DLMLC VMAT using a least square dose fidelity objective.
  • Incorporated anisotropic total variation and single segment terms for fluence smoothness and aperture simplicity.
  • Solved DAO via alternating optimization, incorporating DLMLC deliverability and leaf speed constraints using graph optimization.

Main Results:

  • The novel framework achieved superior dosimetry for DLMLC VMAT compared to SLMLC VMAT with the same leaf width.
  • DLMLC plans significantly reduced organs at risk (OAR) dose metrics (R50, max OAR dose, mean OAR dose) compared to SLMLC plans.
  • Plan quality for single-arc DLMLC was comparable to single-arc SLMLC with finer leaf resolution.

Conclusions:

  • The developed single-arc VMAT optimization framework effectively utilizes DLMLC's dual-layer structure for enhanced modulation.
  • DLMLC VMAT demonstrates superior dosimetric outcomes, particularly in reducing OAR exposure, compared to SLMLC VMAT.
  • This framework represents a significant advancement in radiotherapy planning for DLMLC technology.