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Results

Co-60. Organ at risk (OAR) objectives were met in all cases. However, dose spillage for Co-60 plans would often be considered unacceptable by RTOG 0631 protocol: median V105% out of PTV: 22.8 cc (11.4 cc–26.9 cc) and median V115% out of PTV: 0.3 cc (0.0 cc–8.2 cc). Treatment was delivered considering that this dose spillage was mostly into para-spinal soft tissues and not into OARs. No adverse effects have been observed, and all cases had excellent visualization of spinal anatomy with real-time patient motion tracking and gating. Linac. All OAR objectives were met in all cases. Dose spillage for Linac plans were either per RTOG 0631 protocol or acceptable deviation in all cases. Median V105% out of PTV: 1.4 cc (0.18 cc–3.0 cc) with V115% out of PTV 0.0 cc.

Conclusion

Co-60 MRI-guided SABR achieves an adequate target coverage and OAR sparing for spinal osseous metastases. Treatments …