System (825) and method are set forth in order to collect and reuse the fluid medium obtained from at least a portion of the shunt of the injection of the fluid medium to a selected site within the body of the patient. System includes a sterile medium container (328), disposed in a fluid medium flow path between the injection syringe and (332) and the medium delivery catheter (334) Flow diverter assembly and (575), the flow diverter assembly (575 ) diversion reservoir having a fluid coupling (588b) with respect to the blood reservoir chamber (860,834) and a sterile medium container for receiving the diverted portion of the fluid medium (328) from (827,827A, including 827b) and. Flow diverter assembly (575), during the injection, and a medium flow path between the syringe (332) and a delivery catheter (334), so as to divert at least a portion of the fluid medium injection. Diversion reservoir (827,827A, 827b) prior to allowing the use of the medium in a sterile medium container (328), the re-use of the diverted media in the reservoir chamber (860,834) preferentially It can be configured to.