Dose Course 2018_Flipping book
Calibration: Entrance dose dose at the depth of dose maximum
Ideal situation :
When changing the irradiation conditions the reading of the in vivo
detector changes in the same proportion as changes the i.c. reading
wedge, SSD, (r, ent D
T)
=
SSD, R(r,
wedge,
calFT)
z max
Reality :
Detector+ build up response dependence in dose rate, energy, temperature may differ of those of an i.c. Due to the calibration geometry the detectors “see” different scatter conditions.
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