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Pre-SABR programme
•
Consider immobilisation for each SABR site
•
Audit set-up uncertainties for system used for non-SABR
patients
•
Calculate systematic and random uncertainties
•
Assess if appropriate for SABR by comparing with suggested
SABR margin
•
Adapt as necessary e.g. chin strap, vac bag
September 2015
ESTRO SABR course
5
Population (cm) vert syst vert rnd long syst long rnd lat syst
lat rnd
0.094044 0.14978 0.202467 0.406479 0.152902 0.269381
Margins (mm)
Vert
Long
Lat
3.4
7.9
5.7
Standard lung
immobilisation
35 patients
Standard lung = 9mm PTV margin
SABR lung = 5mm PTV margin