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Frame-based
vs
Frame-less SRS
Invasive
vs
Non-invasive
2
•
A! stereotac9c! system! of!
external2 coordinates2
used! for!
localisa9on!and!posi9oning!
•
The!pa9ent!is!rigidly!fixed!to!a!stereotac9c!system!using!
invasive!techniques,!
ideal2for2single2frac0on2
•
Posi9oning! in!a!mask!system!with!
real20me2 imaging
!
control!
before!each!treatment!
•
Mask!system!relocable!used!
for2more2than2one2frac0on2