He is also a scientist in the Division of Clinical Investigation and Human Physiology at the Toronto General Research Institute. Molecular imaging is a relatively new imaging technology, which involves tracking tumours by exploiting the biochemistry of cancer cells. Reilly’s approach combines radioisotopes with drugs used in standard cancer treatments, converting them into “radiopharmaceuticals”. These release gamma rays which can be imaged using a gamma camera making tumours and cancer cells spreading through the body easier to see, track and remove.