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Relationship between dosimetric leaf gap and dose calculation errors for high definition multi-leaf collimators in

Jinkoo Kim1, James S Han1, An Ting Hsia1

  • 1Department of Radiation Oncology, Stony Brook University Hospital, Stony Brook, NY, United States.

Physics and Imaging in Radiation Oncology
|January 18, 2021
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Summary
This summary is machine-generated.

Increasing the dosimetric leaf gap (DLG) values is crucial for accurate radiotherapy dose calculations. This study found that optimal DLG values minimize dose calculation uncertainty for high-definition multi-leaf collimators (MLC).

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Dosimetric leaf gap (DLG) models the multi-leaf collimator (MLC) round-leaf-end effect, critical for radiotherapy dose calculations.
  • Investigating DLG and dose calculation errors is essential for high-definition MLC accuracy.

Purpose of the Study:

  • To evaluate the relationship between DLG values and dose calculation errors.
  • To determine optimal DLG values for a high-definition MLC in radiotherapy treatment planning.

Main Methods:

  • Physical DLG measurements using the sweeping-gap technique.
  • DLG adjustment based on spine radiosurgery plan measurements.
  • Verification of DLG using film and ion-chamber measurements on a Varian Edge with HD120 MLC (6X, 6XFFF, 10XFFF beams).

Main Results:

  • Physical DLG measurements varied by beam type (0.27-0.42 mm).
  • Calculated doses were systematically lower than measured doses using physical DLG values (3.7-6.8% underestimation).
  • Adjusted DLG values (0.9-1.5 mm) minimized errors, with ion-chamber errors <1% and film gamma pass rates >97%.

Conclusions:

  • Physical DLG values lead to underestimation of calculated doses.
  • Increasing DLG values is necessary to reduce dose calculation uncertainty.
  • Optimal DLG values may be MLC and beam-specific, requiring careful verification.