Electron-tracking Compton camera imaging of technetium-95m

Abstract

Imaging was conducted using an electron tracking-Compton camera (ETCC), which measures γ-rays with energies in the range of 200–900 keV from 95m Tc. 95m Tc was produced by the 95 Mo (p, n) 95m Tc reaction on a 95 Mo-enriched target. A method for recycling 95 Mo-enriched molybdenum trioxide was employed, and the recycled yield of 95 Mo was 70%-90%. Images were obtained with the gate of three energies. The results showed that the spatial resolution increases with increasing γ-ray energy, and suggested that the ETCC with high-energy γ-ray emitters such as 95m Tc is useful for the medical imaging of deep tissue and organs in the human body.