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3D detectors: why are they needed?
Measurement-based plan validation for IMRT/VMAT:
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Demonstrate that an IMRT/VMAT plan can be delivered. Leaf sequences,
gantry speed, dose rate as calculated by the TPS may not take into
account the limitations of the treatment unit and dose distribution as
delivered may not agree with the planned.
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Fluence modulation produces regions with high dose. These hot spots
depend critically on accuracy of the delivery and treatment field set-up
The measurement system should:
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Cover the entire irradiated volume
•
High resolution
•
On line measurement
3D detector
GEL DOSIMETRY