Advanced Physics for Brachytherapy 2018

Conclusions • 3D imaging modalities are essential for modern brachytherapy. • Most convenient: contouring, catheter reconstruction and calculation on the same image set . Registration (moreover non-rigid one) must be carefully evaluated. • CT is the most available. Caution: the limited resolution along the scan axis. Scout views can help with it. • TRUS is mostly used in intraoperative prostate. Caution: needle tip definition. “Free length” can help with it. • MRI T2 has excellent soft tissue definition. Caution: distortion . Phantoms and CT patient data can verify it. • Society Recommendations are available to perform QA/QC of all these image modalities. • TPS applicators libraries and special markers can help in reconstruction to be less sensitive to image resolution and cath. visibility.