SBRT2015

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

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

Standard lung immobilisation 35 patients

Margins (mm)

Vert

Long

Lat 5.7

3.4

7.9

Standard lung = 9mm PTV margin

SABR lung = 5mm PTV margin

September 2015

ESTRO SABR course

5