Abstract– In order to assess the kinetics of radiotracer
accumulation in tissue, the amount of radioactivity in the blood
must be quantitatively measured as an input function to the
kinetic model. Due to safety and comfort issues with invasive
determination of the input function, a non-invasive method for
arterial measurement of blood radioactivity is investigated using a
wrist scanner. A prototype consisting of two detector pairs of
LSO and APD detector arrays is used to obtain planar images of
an anatomically correct wrist phantom. The spatial resolution
and sensitivity of the prototype is determined. The results showed
the detector was able to discriminate the arterial and venous flows
from each other when using planar coincidence images.