Localization of fresh experimental venous thrombi in rabbits using 99mTc-oxine-labeled autologous platelets

99MTc-oxine-labeled autologous platelets were used to visualize fresh experimental venous thrombi in rabbits. Clots were formed by intravenous injection of suspended 1.3 micron iron particles while a magnet was positioned over a vein proximal to the injection site. Thrombi formed prior to and following platelet injection were visualized well.