CT Scanner. Male radiographer (bottom left corner) in the control room of a CT (Computer Tomography or CAT) scanner. The female patient (upper right) is lying on a mobile table which will pass through the circular scanner. The radiographer views the image of the patient's brain on a computer screen. During a CT scan several X-rays are passed through the patient at several different angles. The computer gathers the resultant data and constructs a cross- sectional image of the scanned area. Several cross sections can be scanned. CT scans are particularly good at diagnosing tumours.
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