Global Computed Tomography (CT) Scanners Market By Type (Low-slice Scanners (< 64 slices), Medium-slice Scanners (64 slices), and High-slice Scanners (>64 slices)), By Application (Oncology, Cardio and Vascular, Neurology, and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029