 A recent potential breakthrough in this field of emboli research and prevention in order to improve neurologic outcome after cardiac surgery is the introduction of the EmbodopR system by DWL. This is a high quality TCD system which has been further developed to monitor cerebral emboli. It contains a module which automatically screens every event suspected as embolic, eliminates those recognized as artifacts according to four different criteria and records only real embolic events. Another module can differentiate every event as gas or solid emboli by simultaneously insonating the middle cerebral artery blood with tow ultrasound beams, each of different frequency. The result is a new ability for real time monitoring and characterization of embolic events during cardiac operations. 