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It took about an hour on a weeknight after work, and afterward, Gluck made a throwaway joke to the technician: Am I glowing from the radioactive tracer?

The day of the appointment, the medical staff injected a radioactive tracer into Gluck’s bloodstream, then instructed him to lie down on a machine similar to a CT scanner.

PET is an imaging technique that uses a radioactive tracer to measure metabolic processes in the body.

PET is an imaging technique that uses a radioactive tracer to measure metabolic processes in the body.

PET imaging requires injecting a radioactive tracer molecule into the bloodstream, and spinal fluid must be extracted with a needle inserted between vertebrae in the back.