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SU-E-J-24: Image-Guidance Using Cone-Beam CT for Stereotactic Body Radiotherapy (SBRT) of Lung Cancer Patients: Bony
Medical Physics
|May 19, 2017
Summary
Soft-tissue alignment is crucial and reliable for lung cancer stereotactic body radiotherapy (SBRT). Comparing pre- and post-treatment cone-beam CT (CBCT) confirms accurate target positioning, ensuring treatment effectiveness.
Area of Science:
- Radiation Oncology
- Medical Imaging
Background:
- Stereotactic body radiotherapy (SBRT) for lung cancer requires precise targeting.
- Image guidance is essential for accurate radiation delivery.
- Cone-beam CT (CBCT) is utilized for patient positioning and verification.
Purpose of the Study:
- To evaluate the reliability of soft tissue alignment using pre- and post-treatment CBCT.
- To assess image guidance accuracy in lung cancer SBRT.
Main Methods:
- Patients underwent 4D CT scans for target motion analysis.
- Internal Target Volume (ITV) and Planning Target Volume (PTV) were defined.
- CBCT was used for bony anatomy-based image guidance and patient relocalization.
- Soft-tissue alignment was assessed when bony shifts exceeded 5 mm, with post-treatment CBCT performed for verification.
Main Results:
- Pre- and post-treatment CBCT comparisons were conducted for 7 patients with significant bony shifts.
- Post-treatment CBCT confirmed that target positions remained consistent after soft-tissue alignment adjustments.
- Soft-tissue alignment proved reliable in maintaining target position.
Conclusions:
- Soft-tissue alignment is a necessary component of lung cancer SBRT.
- The use of pre- and post-treatment CBCT demonstrates the reliability of soft-tissue alignment for individual patient cases.
