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Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy
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SU-E-T-173: TomoTherapy Treatment Couch Velocity Verification Using TomoDose.

C Chen1,2, T Bichay1,2

  • 1Lacks Cancer Center, Grand Rapids, MI.

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|May 19, 2017
PubMed
Summary

TomoDose, a quality assurance device, can detect 1-2% variations in TomoTherapy couch velocity. This ensures accurate radiation therapy by verifying table speed constancy, crucial for precise beam delivery.

Keywords:
CollimatorsField sizeQuality assurance

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Accurate TomoTherapy requires precise control of couch velocity and gantry rotation.
  • The TG-148 protocol mandates quarterly film tests to ensure couch velocity constancy.
  • Deviations in couch velocity can impact treatment accuracy and patient safety.

Purpose of the Study:

  • To evaluate the feasibility of using the TomoDose quality assurance device to detect small variations in TomoTherapy couch velocity.
  • To determine if TomoDose can identify deviations of 1-2% from the established baseline couch velocity.

Main Methods:

  • The TomoDose unit's detector array was aligned with the TomoTherapy 'Y' jaws.
  • A baseline table velocity of 0.5 mm/sec was established with a 1 cm collimator field size.
  • Velocities were varied by 1% and 2% (0.490-0.510 mm/sec), with a constant translation time of 400 seconds.

Main Results:

  • A 2% increase in couch velocity resulted in a field size increase to 20.39 cm; a 2% decrease resulted in 19.64 cm.
  • A 1% increase in velocity yielded a field size of 20.18 cm; a 1% decrease yielded 19.76 cm.
  • These results demonstrate a direct correlation between couch velocity and radiation field size.

Conclusions:

  • Variations in couch velocity directly alter the radiation field size during TomoTherapy.
  • The TomoDose device is capable of detecting small couch velocity variations as low as 1%.
  • This method offers a feasible approach for quality assurance in TomoTherapy delivery.