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Related Experiment Videos

TU-E-BRB-10: Dosimetric Consequences of Setup Errors Using CBCT for SBRT Localization.

E Mayyas1, N Wen1, D Liu1

  • 1Henry Ford Health System, Detroit, MI.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

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Accurate tumor localization is crucial for stereotactic ablative radiation therapy (SABR). Cone-beam CT (CBCT) image guidance significantly reduced setup errors, allowing for 2-3 mm margins for effective dose coverage.

Area of Science:

  • Radiation Oncology
  • Medical Imaging
  • Cancer Treatment

Background:

  • Stereotactic ablative radiation therapy (SABR) requires precise tumor targeting due to steep dose gradients and high fractional doses.
  • Accurate patient setup and tumor localization are critical to minimize radiation dose to healthy tissues and maximize tumor coverage.
  • Inter-fraction motion and setup errors can compromise treatment accuracy in SABR for lung cancer.

Purpose of the Study:

  • To evaluate inter-fraction shifts in non-small cell lung cancer (NSCLC) patients undergoing SABR.
  • To investigate the influence of tumor location and internal target volume (ITV) on inter-fraction shifts.
  • To quantify residual errors after cone-beam CT (CBCT) correction and assess their dosimetric impact.

Main Methods:

Keywords:
CancerComputed tomographyCone beam computed tomographyDosimetryLungsMedical imagingRadiation therapy

Related Experiment Videos

  • Retrospective analysis of daily free-breathing (FB) CBCT images from 78 NSCLC patients.
  • ITV inter-fraction displacement assessed by matching CBCT and FB helical CT images.
  • Setup errors quantified using orthogonal kV images; tumor locations categorized (e.g., central, peripheral).

    • Main Results:

    • Mean systematic error (Σinter) was (2.1, 4.2, 2.9) mm, and random error (sinter) was (2.2, 3.2, 3.6) mm.
    • No significant association found between inter-fraction shifts and tumor location or volume.
    • CBCT image guidance reduced setup errors to Σsetup=(0.6, 0.6, 0.4) mm and ssetup=(1.2, 0.7, 0.7) mm.

    Conclusions:

    • CBCT image guidance significantly reduced setup errors in SABR for NSCLC.
    • Population-based setup margins of 2-3 mm are sufficient for >95% ITV dose coverage.
    • Further research on inter- and intra-fraction error classification by tumor location is recommended.