Development of a standardized method for contouring the larynx and its substructures

Mehee Choi, Tamer Refaat, Malisa S. Lester, Ian Bacchus, Alfred W. Rademaker, Bharat B. Mittal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Objectives: Limiting radiation dose to the larynx can diminish effects of laryngeal dysfunction. However, no clear guidelines exist for defining the larynx and its substructures consistently on cross-sectional imaging. This study presents computed tomography (CT)- and magnetic resonance imaging (MRI)-based guidelines for contouring laryngeal organs-at-risk (OARs). Materials and Methods: Standardized guidelines for delineating laryngeal OARs were devised and used to delineate on CT and MRI for head-and-neck cancer patients. Volumetric comparisons were performed to evaluate consistency and reproducibility of guideline-based contours. Results: For the initial 5 patients the mean CT and MRI based larynx volume did not differ significantly between imaging modalities; 34.39 ± 9.85 vs. 35.01 ± 9.47 (p = .09). There was no statistical difference between the CT based mean laryngeal volume in the subsequent 44 patients compared to the initial 5 patients outlined on CT and the MRI scan (p=0.53 and 0.62). The OAR volume for laryngeal substructures were not statistically different among patients or between imaging modalities. Once established, the guidelines were easy to follow. Conclusion: The guidelines developed provide a precise method for delineating laryngeal OARs. These guidelines need to be validated and clinical significance of outlining laryngeal substructures and dose-volume constraints should be investigated before routine implementation in clinic practice.

Original languageEnglish (US)
Article number285
JournalRadiation Oncology
Volume9
Issue number1
DOIs
StatePublished - Dec 3 2014

Keywords

  • Head-and-neck cancer
  • Intensity-modulated radiotherapy
  • Larynx anatomy
  • Organs at risk
  • Swallowing dysfunction

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

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