Advanced Imaging Center at Westchester Medical Center in Hawthorne, NY, provides Positron Emission tomography/Computer tomography scan known as a PET/CT scan. Advanced Imaging Center at Westchester Medical Center is a member of the Westchester Medical Center Health Network (WMCHealth), a 1,700-bed healthcare system headquartered in Valhalla, New York, with 10 hospitals on eight campuses spanning 6,200 square miles of the Hudson Valley.