Brachytherapy for Prostate Cancer 2017

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Impact of interobserver variability on
D90
CT T1+T2 CT+T2
SDref interobserver variability with
respect to reference (1SD)
Ref_D90
MeanObs_D90
Pat ient 1
Patient 2
CT T1+T2 CT+T2
Contouring
large interobserver variability for D90
for all techniques
Seeds
▪ CT: small interobserver spread for D90
▪ slightly larger for technique (b), using
T1 for seeds
Fusion
▪ T1 + T2 : interobserver variability
relatively small, but patient dependent
▪ CT + T2 : large interobserver variability
Patient 3