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Effect of multileaf collimator-defined segment size on S(c).

Parham Alaei1, Patrick Higgins

  • 1Department of Therapeutic Radiology-Radiation Oncology, University of Minnesota, Minneapolis, Minnesota 55455, USA. alaei001@umn.edu

Medical Physics
|July 17, 2010
PubMed
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The output factor is significantly affected by the difference between multileaf collimator (MLC) and jaw settings, especially in intensity-modulated radiation therapy (IMRT). This effect requires careful consideration for accurate dose modeling in radiotherapy.

Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Tertiary multileaf collimators (MLCs) can influence scatter/output factors (S(c)).
  • This effect is often overlooked during commissioning as measurements typically retract MLCs.
  • Discrepancies between MLC and jaw settings are more pronounced in intensity-modulated radiation therapy (IMRT).

Purpose of the Study:

  • To quantify the impact of MLCs on scatter/output factors.
  • To characterize how scatter varies with MLC and jaw settings.
  • To assess the significance of the difference between MLC-defined apertures and jaw settings.

Main Methods:

  • Measured scatter/output factors (S(c) and S(c,p)) for various square field sizes.
  • Utilized jaw settings ranging from 10x10 cm² to 36x36 cm².

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  • Fitted curves to MLC output factors to parameterize the aperture effect.

    • Main Results:

    • A larger difference between MLC-defined aperture and jaw settings leads to a more significant variation in output factors.
    • The aperture effect was successfully parameterized as a function of jaw and MLC settings.
    • The magnitude of the scatter difference was quantified for different field configurations.

    Conclusions:

    • Quantifying the output factor changes due to MLCs is crucial for accurate dose modeling in IMRT.
    • This quantification can improve dose calculations in advanced radiotherapy techniques.
    • Consideration of MLC effects is important for applications like in vivo dosimetry.