Cancer of the Prostate Treated With Focal Implantation of a RadioactivE Source

Targeted focal brachytherapy is an image-guided technique, where the radioactive source is placed only, and directly into the cancerous area of the prostate. The aim is to preserve the normal surrounding prostate gland tissue to limit treatment-related side effects to the adjacent anatomical structures. A multiparametric prostate MRI is used to identify, localize, and delineate the intraprostatic PCa tumour lesion and plan treatment. A specialized MRI-ultrasound image-fusion software combines the MRI-images with dynamic ultrasound performed in the operating room and is used to focally guide the placement of the radioactive source in the prostate cancer (PCa) tumour focus based on focal dosimetry calculations. A safety margin around the tumour is applied where it is possible to account for MRI tumour volume underestimation, microscopic spread, and treatment uncertainties.