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Delivery of intensity-modulated electron therapy by mechanical scanning: An algorithm study.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Robotics in Medicine

Background:

  • Intensity-modulated electron therapy (IMET) offers precise radiation delivery.
  • Mechanical scanning with a robotic arm presents a potential method for IMET delivery.

Purpose of the Study:

  • To develop and evaluate a scanning algorithm for intensity-modulated electron therapy (IMET) using mechanical scanning.
  • To optimize the delivery sequence for IMET to minimize treatment time.

Main Methods:

  • A zigzag scanning algorithm was developed, generating beam positions and selecting discrete energies for target depth.
  • Fast simulated annealing (FSA) was employed to optimize the delivery order of scan spots, minimizing path length.
  • The algorithm was evaluated using CT data from 10 pancreatic cancer patients undergoing intraoperative radiotherapy.

Main Results:

  • FSA optimization reduced scan path lengths by 12%-43% in clinical cases.
  • The average treatment delivery time was 124±38 seconds, with path length reduction yielding up to a 10% decrease.
  • Further reductions in delivery time are possible by increasing machine dose rate, robotic arm speed, and optimizing algorithms.

Conclusions:

  • Mechanically scanned IMET is a feasible and promising approach for radiation therapy.
  • The developed scanning algorithm and optimization strategy effectively reduce treatment delivery time.
  • Further research and development in this area warrant exploration for clinical application.