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A delivery transfer function (DTF) analysis for helical tomotherapy.

Michael W Kissick1, Thomas Rockwell Mackie, Robert Jeraj

  • 1Department of Medical Physics, University of Wisconsin-Madison, Madison, WI 53706, USA.

Physics in Medicine and Biology
|April 19, 2007
PubMed
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This study expands the delivery transfer function (DTF) for helical tomotherapy, accounting for intensity modulation. Source motion blurring in helical tomotherapy is generally negligible for most clinical radiotherapy cases.

Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Previous theoretical work established the delivery transfer function (DTF) for radiotherapy.
  • Helical tomotherapy employs unique intensity modulation using 51 small arcs, which is not currently accounted for in treatment planning.
  • This arc-based intensity modulation introduces source motion blurring.

Purpose of the Study:

  • To expand the theoretical delivery transfer function (DTF) to incorporate the effects of helical tomotherapy's intensity modulation.
  • To quantify the impact of source motion blurring in helical tomotherapy on dose delivery accuracy.

Main Methods:

  • A theoretical DTF was constructed to include the specific source motion of helical tomotherapy.
  • Calculations were performed integrating this source motion with other DTF components.

Related Experiment Videos

  • Resolution maps were generated using typical delivery parameters for constant intensity projections.

    • Main Results:

    • The study quantifies blurring effects in helical tomotherapy, differentiating between leaf collimation, scatter convolution, and source motion.
    • Near the isocenter, transverse blurring is minimal.
    • At radii greater than 6 cm, source motion blurring becomes the dominant factor over leaf size.

    Conclusions:

    • The developed theoretical DTF accurately models helical tomotherapy's unique delivery characteristics.
    • In most clinical scenarios, the inherent source motion blurring associated with helical tomotherapy is considered negligible.
    • This research provides a more comprehensive understanding of dose delivery in helical tomotherapy, aiding in treatment planning optimization.