Different Generations of X-ray CT - Essay Example

Summarizing Lecture s Different Generations of X-ray CT 1st Generation: Parallel projections Had asingle X-ray source and detector cell to collect data for just a single slice. It produced pencil beam and worked via the translation and rotation process. 2nd Generation: multiple detectors They had several detectors and the X-ray source emitted radiations in a wide angle. They would obtain multiple scans multiple projections in a single scan. 3rd: Generation: Fan Beam It had a large array of detectors and would scan in about two seconds.

The detector and tube array would rotate around the patient. 4th Generation: A rotating X-ray tube and stationary detector ring It reduced complexity by reducing motions. Eliminated the translation and rotation motion, had a large fan beam, and had about 4,800 detectors. 5th Generation: Electron Beam CT It was characterized by a large ring that circled the patient. They would produce electron beams of high energy and capable of scanning in milliseconds. It would produce 17 CT slices every second.

6th Generation: Helical The spiral or helical CT generation came about in 1990, and the CTs would capture 3D images. The X-ray tube would rotate as the patient is moved around the scan field. The x-ray tubes had the highest power than prior generations. 7th Generation: Multi-slice CT It was characterized by multiple rows of detector array. It would allow one-millimeter sections through the chest in about 20 seconds. It increased z-resolution and reduced scan time. Non-Medical Applications of Computed Tomography Techniques 1) Scanning products for flaw detection 2) For quality control of fresh vegetables and fruits 3) Imaging of museum artifacts 4) Used to enhance airport security by detecting explosives 5) Used for border control by examining the interior of loaded trucks 6) X-ray crystallography