1*THROMBI ARE NOT VISUALIZED; HOWEVER, THE DECREASE IN FLOW IN THE VENOUS SYSTEM OR THE OBSTRUCTION TO THE DEEP VENOUS SYSTEM IS READILY APPARENT AND IS COMPARABLE TO RADIOGRAPHIC VENOGRAPHY INFORMATION*
2*INCREASED PERFUSION CAN BE VISUALIZED DURING THE ARTERIAL INJECTION PHASE AND THUS PROVIDES SIGNIFICANT INFORMATION FOR THE DIAGNOSIS OF THROMBOPHLEBITIS*
3*ALTHOUGH LABELLED PLATELET STUDIES HAVE NOT FOUND A WIDESPREAD CLINICAL ROLE, THEY ARE OCCASIONALLY USEFUL IN DIFFICULT CASES*
4*LEG ELEVATION ASSISTS IN THE DIFFERENTIATION OF BLOOD POOL ACTIVITY IN VARICOSE VIENS FROM SPECIFIC UPTAKE OF TRACER IN A DVT*