Imaging approach in radioimmunodetection.

External in vivo imaging of tumors with radioactively labeled antibodies to tumor-associated antigens requires processing to remove interfering nontarget radioactivity. Processing entails the use of simulated nontarget compounds labeled with a radionuclide physically different from that on the antibody and substraction of the simulated nontarget activity from the nontargeted antibody. A 2-fold increase of the target to nontarget radioactivity is achieved that has made possible a greater than 70% tumor detection rate.

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