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SU-E-T-317: Dynamic Modulated Brachytherapy (DMBT): Robotic Applicator Design.

Dae Yup Han1,2, Matthew J Webster1,2, Slobodan Devic1,2

  • 1Center for Advanced Radiotherapy Technologies and Department of Radiation Medicine and Applied Sciences, University of California San Diego, La Jolla, California.

Medical Physics
|May 19, 2017
PubMed
Summary

We designed the hardware for Dynamic Modulated Brachytherapy (DMBT) for rectal cancer treatment, achieving high precision. Further refinements will enhance its compactness and functionality for clinical application.

Keywords:
AluminiumAustraliaBrachytherapyCancerRadiation safetyRadiation treatmentRadiotherapy sourcesRoboticsTesting proceduresTungsten

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Robotics Engineering

Background:

  • Rectal cancer treatment often involves complex radiation delivery techniques.
  • Dynamic Modulated Brachytherapy (DMBT) offers a precise approach to radiation delivery.
  • Developing specialized hardware is crucial for implementing advanced brachytherapy concepts.

Purpose of the Study:

  • To investigate and design the necessary hardware for a Dynamic Modulated Brachytherapy (DMBT) system tailored for rectal cancer treatment.
  • To establish the foundational components for a novel brachytherapy delivery robot.

Main Methods:

  • Designed a DMBT robot comprising shield/delivery, control modules, and specialized software.
  • Utilized a tungsten alloy shield with a precise opening, actuated by an aluminum pipe, gear set, and linear actuator.
  • Integrated an Ir-192 source, Nema-17 stepping motor, and USB-6009 DAQ, controlled by custom LabView software for planning and monitoring.

Main Results:

  • The DMBT robot achieved 2 degrees of freedom (linear translation and rotation) with high spatial resolutions (0.0125mm linear, 0.012° rotational).
  • The power delivery system demonstrated rapid motor positioning (0.5s) at high speeds.
  • The control software provided essential functions including shield positioning checks, treatment plan loading, and integrated safety features.

Conclusions:

  • Successfully designed the core hardware components for the DMBT system for rectal cancer.
  • Identified necessary additional components for clinical implementation, including a sheath tube holder and friction reduction system.
  • Proposed future refinements to enhance system compactness by replacing Nema-17 motors with DC servomotors.