Compositions and methods for treating and imaging vulnerable plaque and other inflammatory conditions in a patient rely on the delivery of conversion electron-emitting sources and other radionuclides to regions of exposed collagen in the vasculature or other body lumens. The conversion electron-emitting sources or other radionuclides are coupled to a collagen-binding substance and administered to the vasculature or other body lumen to permit binding for imaging and/or therapeutic purposes.
