1. Head and Neck Matching
• 21 patients
• 116 AP images
• 118 Lat images
• All EPI

2. Results
85.3
12.9
1.8
80.2
17.2
2.6
81.3
6.8
3.4
0
10
20
30
40
50
60
70
80
90
Left-Right Sup-Inf Ant-Post
<3mm
3-5mm
>5mm

3. Overall Compliance
• 92.3% set ups < 5mm
• 55.3% set ups >3mm

4. Literature Comparison
Standard Deviation mm

5. Footstocks vs legrest

6. Legrest vs Footstocks
• 10 patients in each arm/leg!
• Legrest Cohort
– 300 AP Images
– 176 Lat images
• Footstocks cohort
– 291 AP images
– 144 Lat images

7. Legrest vs Footstocks
standard deviation
standard error mm
Legrest Footstocks
Left-Right 0.7 1.3
Sup-Inf 1.3 1.2
Ant-Post 1.5 1.6
Lateral Rotation 1.15° 0.94 °

8. Legrest vs Footstocks
standard deviation random error mm
Legrest Footstocks
Left-Right 1.0 1.3
Sup-Inf 1.4 1.6
Ant-Post 1.6 1.6
Lateral Rotation 1.05 1.43
setups >5mm 89.5% 93.4%

9. Literature Comparison
Standard Deviation mm

10. Z test template
• Imaging template for small pelvic fields
• 349 images z test cohort
• 241 images on-line chort

11. Z test versus Online
Standard Deviation mm
Left - Right Sup - Inf
Std Random Std Random
Z test 0.8 1.2 1.2 1.7
On line 1.5 1.4 1.2 2.0