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Related Experiment Videos

A frameless method for stereotactic radiotherapy

D Jones1, D A Christopherson, J T Washington

  • 1Northwest Medical Physics Center, Lynnwood, WA 98036-7306.

The British Journal of Radiology
|December 1, 1993
PubMed
Summary
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A frameless stereotactic multiple arc radiotherapy (SMART) method uses implanted cranial gold markers for precise tumor targeting. Screwing markers into the cranium improved stability, ensuring accurate radiotherapy delivery with sub-millimeter precision.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Neurosurgery

Background:

  • Stereotactic radiotherapy requires precise patient positioning.
  • Existing methods may involve invasive stereotactic frames.
  • Frameless techniques offer potential advantages in patient comfort and workflow.

Purpose of the Study:

  • To describe and evaluate a frameless method for stereotactic multiple arc radiotherapy (SMART).
  • To assess the precision and stability of a novel gold marker-based localization system.
  • To determine the clinical feasibility of the described technique.

Main Methods:

  • Implantation of three gold wire markers into the scalp.
  • Localization of markers and target using computed tomography or angiography.

Related Experiment Videos

  • Calculation of required couch movements using the ISOLOC computer program.
  • Refinement of positioning through repeated beam film analysis until sub-millimeter accuracy is achieved.
  • Modification to cranial screw fixation for improved marker stability.

    • Main Results:

    • The frameless SMART method allows for precise patient positioning.
    • Initial subcutaneous marker implantation showed instability in approximately 25% of patients.
    • Cranial screw fixation of markers significantly improved system stability.
    • Phantom studies and clinical treatments demonstrated sub-millimeter accuracy in target localization and delivery.

    Conclusions:

    • Frameless stereotactic multiple arc radiotherapy is feasible using cranial gold markers.
    • Cranial fixation of markers is crucial for achieving a stable reference system.
    • The described method offers a precise and potentially more comfortable alternative for radiotherapy delivery.