INTENSITY-MODULATED ARC THERAPY: Clinical Implementation and Experience

  • Cedric Yu
  • Dong-Jun Chen
  • Allen Li
  • Lijun Ma
  • David Shapard
  • Mehrdad Sarfaraz

Abstract

Intensity-modulated arc therapy, or MAT, is one of the methods for delivering intensity-modulated radiation treatments to achieve high dose conformity. Instead of delivering intensity-modulated beams with fixed gantry angles [1], IMAT delivers optimized dose distributions by rotating the radiation beam around the patient. During delivery, the field shape, which is formed by a multileaf collimator (MLC), changes constantly as determined by the required intensity distributions at different beam angles. Intensity distributions at all angles around the patient are achieved with multiple overlapping arcs of different field apertures and gantry speed. Therefore, IMAT is also different from tomotherapy[2,3], which use intensity modulated fan beams rotating around the patient to delivery the treatment slice-by-slice. As with tomotherapy, IMAT combines intensity modulation and rotational delivery. Detailed description of the technique was reported by Yu in a previous article [4].

Keywords

Carol 

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References

  1. [1]
    Bortfeld T R, Kahler D L, Waldron T J, and Boyer A L 1994 X-ray field compensation with multileaf collimators Int. J. Rad. Oncol Biol Phys. 28(3), 723–730CrossRefGoogle Scholar
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    Carol M P 1994 An automatic 3D conformal treatment planning system for linear accelerator based beam modulation radiotherapy Proceedings of the XIth International Conference on the Use of Computers in Radiation Therapy Ed: Hounsell A R, Wilkinson J M, and Williams PC, 172–3Google Scholar
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    Mackie T R, Holmes T, Swerdloff S, Reckwerdt P, Deasy JO, Yang J, Paliwal B, Kinsella T 1993 Tomotherapy: a new concept for the delivery of dynamic conformal radiotherapy Med. Phys. 20(6), 1709–19PubMedCrossRefGoogle Scholar
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    Yu, C X 1995 Intensity-modulated arc therapy with dynamic multileaf collimation: an alternative to tomotherapy. Phys. Med. Biol. 40 1435–49PubMedCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Cedric Yu
    • 1
  • Dong-Jun Chen
    • 1
  • Allen Li
    • 1
  • Lijun Ma
    • 1
  • David Shapard
    • 1
  • Mehrdad Sarfaraz
    • 1
  1. 1.University of Maryland School of MedicineUSA

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