SRS Immobilization

Question 1

Erik Paper…immobilization devices used

Answer 1

1. Civco Type S IMRT mask (head only) w/head cushion
2. Civco Uniframe mask w/ head cushion And Bluebag
3. Civco Type S head and shoulder mask with head and shoulder cushion
4. Same as 3 with a mouthpiece

Question 2

Results…best system?
Results interfractional…
Results intrafractional…

Answer 2

4
devices 1-4 respectively… shifts (SD) in mm
interfractional
2.3 (1.4), 2.2 (1.1), 2.7 (1.5), 2.1 (1.0)
intrafractional
1.1 (1.2), 1.1 (1.1), 0.7 (0.9), 0.7 (0.8)