A system (100) for and a method of visualizing quality information to a person performing a procedure of temporarily or permanently placing energy provision sources in a part of a body of a living being are provided. The body comprises a volume of interest. The system (100) comprising an input (104) for receiving a treatment plan (102), a data storage (108) for storing positions (P1, P2) of previously placed energy provision sources, a sub-system (106) for determining a shape and a position of the volume of interest, a tracking system (107) for obtaining tracking information relating to a placement tool for guiding a to-be-placed energy provision source towards a specific position, a processing 107 device (110) configured for calculating a dose-volume histogram (114) for the volume of interest, and a display device (112) for presenting the dose-volume histogram (114) to the person.
