494 / 1840
Example: 70 Gy (lip tumor)
• Reference dose rate = 0.52 Gy / hour
• 70 (Gy) / 0.52 (Gy /h) = 134.6 hours
• = 5.6 days (5 days and 14 hours and 24 minutes)
• Time adjustment: 3 hours
• Treatment time = 5 days 18 hours
• decay = 1.5 – 2 Gy….
67