Abstract
After a new gamma-emitting radiodiagnostic agent is synthesized and its chemical structure defined, serial camera imaging following administration to experimental animals can quickly determine its major organ localization. Blood and plasma disappearance curves and urinary excretion at different time intervals are also measured. For renal agents, with negligible extrarenal concentration or excretion, a double exponential analysis of the plasma disappearance curve may be used to quantitate renal clearance, in dogs (Blaufox et al., 1963) or even in small animals like the rat (Blaufox et al., 1970). If a new agent appears promising for eventual human use, more detailed concentration values are required for various organs at different time intervals. These are generally obtained by direct tissue radioassay following the sacrifice of a series of animals. It is frequently rewarding to compare (by dual channel pulse height analysis) the distribution of a new agent with that of an older one with similar organ localization, simultaneously injected and labeled with a radionuclide of different gamma energy. These tissue concentration data from animals are essential to calculate preliminary radiation dose estimates, before administration to humans is considered.
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McAfee, J.G., Subramanian, G. (1983). Experimental Models and Evaluation of Animal Data for Renal Radiodiagnostic Agents. In: Lambrecht, R.M., Eckelman, W.C. (eds) Animal Models in Radiotracer Design. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-5596-3_7
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DOI: https://doi.org/10.1007/978-1-4612-5596-3_7
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