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Table 3 Dose distributions to the target with simulation of 0 mm, 1 mm and 2 mm safety margins 1) in the treatment plan (plan), 2) in the scenario of radiosurgery without image-guidance (No IG), 3) in the scenario of radiosurgery after image-guided correction of translational errors only and not rotations (IG trans) and 4) simulating errors observed immediately following image-guided radiosurgery (Post IG-RS)

From: Dosimetric consequences of translational and rotational errors in frame-less image-guided radiosurgery

Safety margin

 

Plan

No IG

IG trans

Post IG-SRS

0 mm

Absolute CI

0.96

±0.06

0.72

±0.19

0.96

±0.06

0.94

±0.07

 

<95% planned CI

 

91%

3%

14%

1 mm

Absolute CI

1.00

±0.01

0.82

±0.19

1.00

±0.01

0.99

±0.01

 

<95% planned CI

 

70%

0%

0%

2 mm

Absolute CI

1.00

±0.04

0.90

±0.17

1.00

±0.04

1.00

±0

 

<95% planned CI

 

40%

0%

0%

  1. Absolute values of the coverage index (average ± standard deviation) and percent of the patients with <95% planned target coverage are summarized.