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Related Experiment Videos

Relation between local cure and dose-time-volume factors in interstitial implants.

J M Burgers, H K Awwad, R van der Laarse

    International Journal of Radiation Oncology, Biology, Physics
    |April 1, 1985
    PubMed
    Summary

    This study on brachytherapy for tongue, bladder, and perineum cancers found average dose best predicts outcomes. Careful treatment planning is crucial for tongue cancer to prevent geographical misses and ensure effective radiation therapy.

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    Physics in medicine and biology·2003

    Area of Science:

    • Radiation Oncology
    • Medical Physics
    • Oncology

    Background:

    • Brachytherapy is a key treatment for various cancers, including tongue, bladder, and perineum.
    • Accurate dosimetry and treatment planning are essential for optimizing radiation therapy outcomes.
    • Understanding the relationship between dose, volume, and treatment results is critical for improving patient care.

    Purpose of the Study:

    • To analyze dose and volume data from 119 patients treated with radium or iridium-192 implants.
    • To evaluate the impact of treated volume, dose variation, and geographical defects on treatment outcomes.
    • To identify the most predictive dosimetric parameters for local tumor control.

    Main Methods:

    • Utilized a computer dosimetry system for detailed analysis of treatment parameters.

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  • Examined prescribed dose, average dose, and Cumulative Radiation Effect (CRE) including time and volume corrections.
  • Correlated dosimetric data with treatment results for tongue, bladder, and perineum cancers.

    • Main Results:

    • Average dose emerged as the strongest predictor of local treatment success for tongue and perineal implants.
    • Identified the critical need for precise treatment volumes and avoidance of geometric defects in tongue cancer.
    • The hypothesis regarding a dose reduction factor for high-dose-rate brachytherapy was not supported by the data.

    Conclusions:

    • Average dose is a superior dosimetric parameter for predicting local control in brachytherapy for tongue and perineal cancers.
    • Meticulous attention to treatment volume and geometric accuracy is paramount for successful tongue cancer treatment.
    • Current data does not necessitate a dose reduction factor for high-dose-rate brachytherapy in these indications.