ESTRO course Dose Modelling and Verification 2017

In air scanning of lateral profiles

The signal scored by a scanned detector is directly proportional to the energy fluence only if the spectrum is constant!

  , x y





, x y 

response



Signal is proportional to

The energy absorption coefficient m en material varies with lateral spectral shifts.

of any buildup

wat

  , x y





, x y

m





Since primary dose for CPE is very close to scanning in air could yield results that decribes how the primary dose will vary laterally! en

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