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Related Experiment Videos

Multiple machine implementation of enhanced dynamic wedge

E E Klein1, R Gerber, X R Zhu

  • 1Radiation Oncology Center, Mallinckrodt Institute of Radiology, St. Louis, MO 63110, USA.

International Journal of Radiation Oncology, Biology, Physics
|April 8, 1998
PubMed
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Enhanced Dynamic Wedge (EDW) software was successfully implemented on four machines, improving treatment techniques and daily efficiency. EDW offers larger field sizes and additional angles for wedged fields, enhancing radiation therapy.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Technology

Background:

  • Experience with Dynamic Wedge (DW), a 1D compensation system, preceded the implementation of Enhanced Dynamic Wedge (EDW).
  • EDW offers expanded capabilities including larger and asymmetric field sizes and additional angles for wedged fields.
  • Implementation was performed on four dual-energy accelerators equipped with physical wedge sets.

Purpose of the Study:

  • To implement EDW software across four machines using a single common wedge factor (WF) table and treatment-planning files.
  • To evaluate the feasibility and consistency of EDW implementation in a clinical setting.

Main Methods:

  • Measured wedge factors (WFs) using an ionization chamber and isodose profiles with film and a diode array.

Related Experiment Videos

  • Employed a calculation scheme requiring only wedge angle and fixed jaw values for treatment planning.
  • Assessed multileaf collimation (MLC) orientation impact and compared dosimetric consistency with physical wedges.

    • Main Results:

    • EDW wedge factors were consistent across all four machines within +/- 1.5%.
    • Calculated isodose profiles closely matched measured profiles, demonstrating treatment planning filter accuracy.
    • EDW implementation did not compromise MLC orientation for treatment sites, and physical wedge consistency varied.

    Conclusions:

    • Successful implementation of EDW on four machines was achieved with a single WF table and treatment-planning filters.
    • EDW enhances treatment techniques for specific sites through larger field sizes and additional angles.
    • Daily treatment efficiency increased due to EDW's remote capabilities.