Purpose: To test the feasibility of starting an SBRT program at the Oncology Directorate of Komfo Anokye Teaching Hospital (KATH) in Ghana. Currently only two institutions offer RT services to citizens and foreigners. Current infrastructure has major challenges leading to radiotherapy gaps. Hence running a successful program will offer patients the benefit of a substantially shorter radiation schedule without sacrificing results.
Methods: A lung phantom was designed from locally sourced materials: wood to simulate lungs tissue, perspex tank filled with water simulated tissue and a roll-on ball filled with acrylic simulated a central tumour. A motion platform was developed to mimic breathing in the superior- inferior direction (0.5 cm and 1 cm). Standard and slow CT scans of the phantom were acquired. Using RTOG 0915 protocol a dose fractionation of 50Gy/5 was delivered to the phantom only, and 50Gy/5 and 48Gy/5 for clinical case of 3cm and 1cm tumour sizes, were used as case studies to demonstrate dose to organs-at-risk (OARs) and target.
Results: Dose deviation for treating the motionless phantom tumour was 8.43%, -4.31% for 0.5 cm motion, and -25.96% for 1 cm motion. Dosimetric analysis for PTV V100%, V99%, V90% at 50 Gy/5 without motion were 86.77%, 91.19% and 99.96%; with 0.5 cm motion were 98.60%, 99.61% and 100% and with 1 cm motion were 72.72%, 90.47% and 99.65% respectively. Clinical analysis for PTV V100%, V99%, V90% at 48 Gy/5 were 101.10%, 102.62% and 100.49% respectively. For a tumour size of 3 cm at 50 Gy/5 were 98.10%, 99.68% and 100% respectively and for 1 cm tumour size were 97.36%, 99.19% and 100 % respectively.
Conclusion: We have successfully demonstrated the feasibility of SBRT at KATH using a locally made phantom. Results shows great target coverage without compromising OAR coverage.
Not Applicable / None Entered.