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Positron Corporation is an American nuclear medicine healthcare company specializing in cardiac Positron Emission Tomography -LRB- PET -RRB- imaging .. nuclear medicine. nuclear medicine. cardiac. cardiac. Positron Emission Tomography. Positron Emission Tomography. Positron operates in a variety of business areas combining cardiac PET imaging technology , radiopharmaceuticals and radioisotopes .. cardiac. cardiac. Positron is headquartered in Westmont , Illinois and holds three facilities  : a radioisotope manufacturing facility in Lubbock , Texas , a clinical and technical cardiovascular PET training institute in Niagara Falls , New York and an automation manufacturing facility in Fishers , Indiana .. The company 's products and services enable healthcare providers to diagnose cardiac disease and improve patient outcomes .. cardiac. cardiac. Positron Corporation is a public company and traded on the Financial Industry Regulatory Authority , Inc. 's OTC Bulletin Board under the ticker symbol POSC .. public company. public company