title: Preparation and use of 123I-labeled highly iodinated fibrinogen for imaging deep-vein thrombi.
abstract: A method for producing protein-iodination-grade 123I suitable for use with a compact bio-medical cyclotron is reported. The preparation of highly iodinated fibrinogen (25 123I atoms per molecule) is described, and its successful use as a thrombus-imaging agent in experimental animals is reported. This new agent clears from the blood faster than conventional radioiodinated fibrinogen and gives higher thrombus-to-blood activity ratios. Thus, the detection of deep-vein thrombi in areas of large blood pool is enhanced, and images can be obtained sooner after administration of the radiopharmaceutical. Induced 4--8-hr-old femoral-vien thrombi in dogs can be well visualized with a scintillation camera as early as 4 hr and as late as 15 hr after administration of 1 mCi of 123I-labeled highly iodinated fibrinogen.
mesh_terms: D000818:Animals; D004285:Dogs; D005268:Femoral Vein; D005340:Fibrinogen; D007457:Iodine Radioisotopes; D007553:Isotope Labeling / Q000379:methods*; D011877:Radionuclide Imaging; D013924:Thrombophlebitis / Q000175:diagnosis*; D013927:Thrombosis / Q000175:diagnosis
chemical_list: D007457:Iodine Radioisotopes; D005340:Fibrinogen