Normal pharmacokinetics of 99mTc-diphosphonate after intravenous administration.
In the past several years bone imaging has become a routine diagnostic tool for the nuclear medicine clinician. However, increased information may be derived by determining the ratio-pharmacokinetic parameters associated with blood, urine, and bone. In an adult male population of normals (N = 5--6) blood clearance, urinary excretion, and skeletal uptake of 99mTc-Diphosphonate were determined as a function of time after intravenous (i.v.) administration. The quantitative imaging studies (lower lumbar region) were performed up to 1 h post administration with a scintillation camera interfaced to a computer. Blood levels exhibited a triexponential clearance pattern and urinary excretion of the radiopharmaceutical was essentially complete by 4 h. The computer-generated images showed an initial early uptake in bone, kidneys, and soft tissue. Thereafter, a parallel fall-off in activity was observed in kidneys and soft tissue, with a concomitant increase in bone.
D000328:Adult; D001842:Bone and Bones / Q000000981:diagnostic imaging / Q000378:metabolism; D004164:Diphosphonates / Q000008:administration & dosage / Q000378:metabolism*; D006801:Humans; D007275:Injections, Intravenous; D007700:Kinetics; D008297:Male; D011877:Radionuclide Imaging; D013667:Technetium / Q000008:administration & dosage / Q000378:metabolism*; D017556:Technetium Compounds
D004164:Diphosphonates; D017556:Technetium Compounds; D013667:Technetium; C029045:technetium Tc 99m diphosphonate