ESTRO Brachytherapy for Prostate Cancer 2018

Margins ? ! ?

But margins for ………….

• uncertainties in seed placement ?

- x/y direction – no problems

- z direction – corrections during implantation

• change of volume ?

- only temporary problem

- edema resolves within the first ½ life of seeds

• change of position ?

- eventual use of stabilization needles

- continuous on-line verification of position

So: forget about margins for PTV definition PTV = CTV