IMRT 2018
3"parameters"affecting dose distribution"and"treatment time
• Fan%beam%thickness%(FBT) • Modulation%Factor%(MF) • Pitch%(P)
Parameter:
Effect%on: Dose%distrib. Treatment%time%
FBT:%%% ! MF:%%% ! Pitch: !
worsens improves worsens
decreases (directly%proportional)
increases decreases
A%judicious/wise%selection%of%pitch,%modulation%factor%and%field%size%is%required%to produce%a%homogeneous%dose%distribution%along%with%an%acceptable%treatment%time.
Hui: MP 32 (10) 2005, 3214-3224
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