Princess Margaret Cancer Centre, Toronto, Canada

This chapter describes the configuration and design of the brachytherapy room when it is configured to interface with the magnetic resonance (MR) system. It describes the brachytherapy facility of a larger magnetic resonance imaging (MRI) guidance facility built within the Princess Margaret Cancer Centre. Three-dimensional treatment planning is the modern standard for brachytherapy as computed tomography (CT) imaging has widely replaced projection imaging in brachytherapy practice. When the MR-brachytherapy doors, which provide both radiation and radiofrequency (RF) shielding, are closed, adjacent MR room can be used as a standalone MR simulation suite. The brachytherapy room features sufficient RF shielding so that the space can also be used for MRI when the MR-brachytherapy doors are opened to allow the MR travel into the brachytherapy space. Safety considerations for radiation therapy and MRI are both well developed, with well-known best practices. The MR system is an adaptation of IMRIS Visius Surgical Theatre, which includes an MR scanner and ceiling-mounted MR transport system.