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Lung density as measured by computerized tomography: implications for radiotherapy

J Van Dyk, T J Keane, W D Rider

    International Journal of Radiation Oncology, Biology, Physics
    |August 1, 1982
    PubMed
    Summary

    Accurate radiotherapy dose calculations depend on patient lung density, which varies with age and breathing. CT scans reveal these variations, impacting dose calculations significantly.

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    Area of Science:

    • Medical Physics
    • Radiotherapy
    • Diagnostic Imaging

    Background:

    • Accurate radiotherapy dose calculations require precise patient internal anatomy data, including density.
    • Computed tomography (CT) is the primary imaging modality for obtaining this anatomical information.
    • Lung density is a critical factor in radiotherapy planning, particularly for thoracic treatments.

    Purpose of the Study:

    • To investigate the relationship between patient age, respiratory phase, and lung density.
    • To determine the dosimetric impact of variations in lung density on radiotherapy dose calculations.
    • To analyze the clinical implications of lung density measurements in radiotherapy planning.

    Main Methods:

    • CT scans of 58 thoracic radiotherapy patients were analyzed.

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  • CT numbers were converted to relative electron densities to determine average lung densities.
  • Dose calculations were performed using scans acquired under different respiratory conditions (inspiration, expiration, normal breathing).

    • Main Results:

    • A linear correlation was found between lung density and patient age, decreasing from 0.35 at age 5 to 0.19 at age 80.
    • Respiratory volume changes correlated linearly with relative electron density changes.
    • Dose calculations for a single cobalt-60 beam varied by over 25% between full inspiration and normal breathing scans.

    Conclusions:

    • Patient age and respiratory phase significantly influence lung density, affecting radiotherapy dose calculations.
    • Differences in lung density due to breathing can lead to substantial variations in calculated radiation doses.
    • Accurate CT-based lung density measurements are crucial for precise radiotherapy planning and treatment delivery.