External Beam RT for Prostate Cancer - ASTRO

Decreasing “systematic” setup error from
simulation to treatment is over half the battle
• At simulation: Goal is reproducible anatomy
– Comfortable position (a relaxed patient is a stable patient)
– Empty rectum (allows use of tighter posterior margin)
– Do not overfill bladder
– Consider possible CT “table sag”
• During treatment: Be proactive
– Educate patients about bladder and rectal filling (give
feedback)
– IGRT primarily for translational rather than rotational shifts
– Examine large variations