Dose Course 2018_Flipping book

3D detectors: why are they needed?

Measurement-based plan validation for IMRT/VMAT:

- 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.

- 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:

• Cover the entire irradiated volume

3D detector

GEL DOSIMETRY

High resolution

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On line measurement

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