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Related Experiment Videos

Peripheral dose from uniform dynamic multileaf collimation fields: implications for sliding window

D S Sharma1, Animesh, S S Deshpande

  • 1Department of Medical Physics, Tata Memorial Hospital, Dr. Ernest Borges Marg, Parel, Mumbai, 400 012, India.

The British Journal of Radiology
|April 6, 2006
PubMed
Summary

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Dynamic sliding window intensity-modulated radiotherapy significantly increases peripheral dose (PD) compared to static fields. This rise in PD is linked to increased monitor units and varies with field size and strip width, impacting patient safety.

Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Sliding window intensity-modulated radiotherapy (IMRT) may increase peripheral dose (PD) compared to conventional techniques.
  • Increased monitor units (MUs) in dynamic IMRT are a potential cause for elevated PD.

Purpose of the Study:

  • To quantify the peripheral dose (PD) from dynamic multileaf collimation (DMLC) fields.
  • To compare PD from DMLC fields with static open fields.
  • To investigate factors influencing PD in DMLC, including field size, strip width, depth, and collimator rotation.

Main Methods:

  • Peripheral dose (PD) was measured using a 0.6 cm3 ionization chamber in a plastic water phantom for a 6 MV linear accelerator.
  • Measurements were conducted for static and dynamic multileaf collimation (DMLC) modes across various field sizes (6x6 cm, 10x10 cm, 14x14 cm) and strip widths (0.5 cm to 2.0 cm).

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  • The influence of measurement depth and collimator rotation on PD was also assessed.

    • Main Results:

    • Dynamic fields required 2 to 14 times more monitor units (MUs) than static fields.
    • All DMLC fields delivered higher PD than static fields, with the highest increases observed for smaller strip widths and larger field sizes.
    • PD showed a distinct pattern with a crest and trough within 30 cm of the field edge, followed by an exponential fall. PD decreased with increased depth and with in-plane collimator motion.

    Conclusions:

    • Dynamic multileaf collimation (DMLC) significantly increases peripheral dose (PD) compared to static fields.
    • Understanding PD from DMLC is crucial for estimating whole-body dose and the risk of secondary malignancies.
    • Optimizing DMLC parameters and considering measurement depth and collimator orientation can help mitigate increased PD.