IMRT

Frameless: immobilization intrafraction

l Analysis of intrafraction motion by taking only small table rotations: g Mean 3D of 0.51mm (SD 0.13mm) l Small compared to: g Frameless intrafraction motion measured at end of treatment: l Mean 3D of 0.58mm (SD 0.42mm) l Comparable to: g Invasive framebased fixation: l Mean 3D of 0.40mm (SD 0.30mm) (Ramakrishna R&O’10)

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