Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Int J Radiat Oncol Biol Phys. 1988 Nov;15(5):1251-6.

Quadtrees as a representation for irregularly shaped fields in radiotherapy applications.

Author information

  • 1Joint Center for Radiation Therapy, Harvard Medical School, Boston, MA 02115.

Abstract

The choice of data representations in treatment planning software impacts on the accuracy of the treatment plan and the total computation time. We present the quadtree data structure as one such representation for irregularly shaped fields in a three-dimensional electron pencil-beam algorithm. The quadtree subdivides the irregular field into pencil-beams of unequal size and considerably reduces the number of pencil-beams needed in the dose calculation while preserving the calculational accuracy. Small pencil-beams are concentrated around the field edges to provide optimal resolution and computational accuracy in penumbra regions. The quadtree simplifies the evaluation of the pencil-beam fluence at a given depth, and removes systematic errors present in alternative implementations. The quadtree algorithm results in a ten-fold performance improvement when compared to alternative implementations for the irregular field.

PMID:
3182356
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk