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Correcting Patient position
How stable is a mask?
Study
Immobilisation system Imaging modality Position error
Boda Heggeman 2006
Thermoplastic mask
CBCT
1.8mm
±
0.7mm1.3mm
Scotsch cast mask
1.3mm
±
1.4mm
Masi 2008
Thermoplasic mask & Bite
block
CBCT
<1.0mm
Bite block
<1.0mm
Lamda 2009
BrainLab mask
2D kV images
0.5mm
±
0.3mm
Ramakrishna 2010
BrainLab mask
2D kV images
0.7mm
±
0.5mm
Guckenberger 2007
Scotsch cast mask
CBCT
0.8mm
±
0.4mm
Thermoplastic mask
0.8mm
±
0.5mm
Courtesy M. Guckenberger, ESTRO IGRT course