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Rotating-shield brachytherapy for cervical cancer.

Wenjun Yang1, Yusung Kim, Xiaodong Wu

  • 1Department of Biomedical Engineering, University of Iowa, 1402 Seamans Center for the Engineering Arts and Sciences, Iowa City, IA 52242, USA.

Physics in Medicine and Biology
|May 18, 2013
PubMed
Summary

Rotating shield brachytherapy (RSBT) improves cervical cancer treatment by increasing the high-risk clinical target volume dose (HR-CTV D90) compared to conventional methods. This technique enhances dose delivery without compromising organ-at-risk sparing.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Oncology

Background:

  • Cervical cancer treatment often involves brachytherapy.
  • Optimizing dose delivery to the tumor while sparing organs at risk is crucial.
  • Conventional intracavitary brachytherapy (ICBT) has limitations in dose distribution.

Purpose of the Study:

  • To evaluate the potential benefits of a novel rotating shield brachytherapy (RSBT) technique for cervical cancer.
  • To compare RSBT with conventional intracavitary brachytherapy (ICBT) and intracavitary plus supplementary interstitial (IS+ICBT) approaches.
  • To assess the impact of different azimuthal emission angles (45° and 180°) in RSBT on treatment planning.

Main Methods:

  • Treatment plans were generated for five cervical cancer patients using ICBT, IS+ICBT, and RSBT (at 45° and 180° emission angles).

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  • High-risk clinical target volume (HR-CTV) equivalent dose in 2 Gy fractions (EQD2) was escalated to tolerance limits of organs at risk (bladder, rectum, sigmoid colon).
  • External beam radiotherapy doses were accounted for, and brachytherapy was planned in 5 fractions.

    • Main Results:

    • Intracavitary plus supplementary interstitial (IS+ICBT) improved HR-CTV D90 over conventional ICBT.
    • RSBT with a 45° emission angle (RSBT-45) achieved higher D90 than IS+ICBT in all patients.
    • RSBT-45/180 demonstrated average D90 increases of 16.2 Gy over ICBT and 8.5 Gy over IS+ICBT, with a mean treatment time increase of approximately 34.5 minutes per fraction.

    Conclusions:

    • Rotating shield brachytherapy (RSBT) can enhance the high-risk clinical target volume dose (HR-CTV D90) compared to ICBT and IS+ICBT.
    • RSBT allows for improved tumor coverage without compromising organ-at-risk sparing.
    • The degree of D90 and treatment time improvement with RSBT is dependent on patient anatomy and the chosen shield emission angle.