IMRT

4. In-vivo dosimetry

Planning CT (3D)

EPID treatment image (2D)

Planning dose (3D)

EPID portal dose (2D imager plane)

select mid-plane slice

back-projection

Planning dose (2D patient mid-plane)

EPID dose (2D patient mid-plane)

γ -evaluation

separate fields, 2D

Courtesy B. Mijnheer