Advanced Physics for Brachytherapy 2018

Source Tracking

• 1 IV dosimeter and at least 3 dwell positions ➢ Or 3 dosimeters and 1 dwell positions

✓ +1 on a separate line removes solution degeneracies

• Knowledge of source channel: catheter(s) / applicator

• Knowledge of expected dose at the dosimeter position from each dwell position ➢ High SNR/SBR dosimeter ➢ Energy/temperature/angle independent or corrected • Express any deviation in measured dose as a positional deviation along the channel axis (  z) and radial distance from it (  r)

Johansen J.G. et al. Brachy. 17 122-132 (2018)