Internal target volume reproducibility and dose coverage for lung stereotactic body radiotherapy using spine-based positioning and tracking

Key Points

• This research aims to evaluate the reproducibility of internal target volume and dose coverage in lung radiotherapy using spine-based positioning and tracking techniques.
• 4D dose calculations were conducted for lung targets.
• The study assessed the reproducibility of dose coverage.
• Partial targets outside of 5 mm margins were evaluated based on positioning.
• Uncertainty measurements were analyzed in relation to spine distance.
• 11% of treatments had partial targets outside 5 mm margins.
• Uncertainty increased by +0.2 mm per cm of distance anterior-posteriorly.
• 2.6% of treatment fractions experienced larger dose losses using 5 mm margins.