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Prostate cancer

Radiotherapy for Prostate Cancer: New Research Uncovers Techniques to Improve Treatment Accuracy

Strategic Insights

— 2 min read

Researchers from Aarhus University Hospital in Denmark have conducted a study on the impact of motion on radiotherapy for high-risk prostate cancer patients, discovering a framework for monitoring motion-induced dose perturbations. The results suggest that the framework, dubbed "DoseTracker," can accurately calculate the motion-induced dose errors and provide reliable dose calculations, paving the way for real-time dose-guided high-risk prostate radiotherapy. The study found that the translational motion was the largest in the cranio-caudal and anterior-posterior directions, with pitch being the largest rotation.

Key Takeaways:

  • The study involved 20 high-risk prostate cancer patients treated with 3-arc volumetric modulated arc therapy (VMAT), with kilovoltage intrafraction monitoring (KIM) used for retrospective 6DoF intrafraction prostate motion estimation.
  • The framework, DoseTracker, successfully monitored motion-induced dose perturbations for both the prostate and pelvic lymph nodes target volumes in 6DoF.
  • The translational motion was largest in the cranio-caudal (CC) direction, ranging from -5.9 to +8.4 mm for the prostate and -9.9 to +11.0 mm for the LN, while the pitch was the largest rotation, ranging from -22.5 to +25.2 degrees for the prostate and -3.9 to +5.5 degrees for the LN.
  • The prostate CTV dose distribution deviation (DD) was -16.2 to +2.5% for single fractions and -3.0 to +1.7% after averaging, while the LN CTV DD was -19.8 to +1.2% for single fractions and -3.1 to +0.9% after averaging.
  • The DoseTracker calculation was fast enough to keep up with the incoming inputs for all but two out of 107,184 dose calculations.
  • The research concluded that the framework provided reliable dose calculations and a sufficiently high-dose reconstruction speed to be applicable in real-time.

Statistics:

  • The study involved 20 high-risk prostate cancer patients.
  • The translational motion was largest in the cranio-caudal direction, ranging from -5.9 to +8.4 mm for the prostate and -9.9 to +11.0 mm for the LN.
  • The pitch was the largest rotation, ranging from -22.5 to +25.2 degrees for the prostate and -3.9 to +5.5 degrees for the LN.
  • The prostate CTV dose distribution deviation (DD) was -16.2 to +2.5% for single fractions and -3.0 to +1.7% after averaging.
  • The LN CTV DD was -19.8 to +1.2% for single fractions and -3.1 to +0.9% after averaging.
  • The DoseTracker calculation was fast enough to keep up with the incoming inputs for all but two out of 107,184 dose calculations.

Sources:

  • NewsRx. Aarhus University Hospital Reports Findings in Prostate Cancer (Quantifying dose perturbations in high-risk prostate radiotherapy due to translational and rotational motion of prostate and pelvic lymph nodes). Information Technology Newsweekly. September 24, 2024; p 15.
  • Aarhus University Hospital. Quantifying dose perturbations in high-risk prostate radiotherapy due to translational and rotational motion of prostate and pelvic lymph nodes. Medical Physics, 2024.

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