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Historical Development

Historical Development. CT scanners are categorized into several generations depending on the type of detectors, scanning method etc. First Generation Scanners. Single detector, single x-ray tube, rotate/translate pencil beam system, rotation angle/step 1 ° Long scan time

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Historical Development

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  1. Historical Development • CT scanners are categorized into several generations depending on the type of detectors, scanning method etc

  2. First Generation Scanners • Single detector, single x-ray tube, rotate/translate pencil beam system, rotation angle/step 1° • Long scan time • Poor spatial resolution • Best scatter rejection

  3. First generation model of a CT head scanner

  4. Second Generation Scanners • Linear array of about 30 detectors, single x-ray tube, rotate/translate motion, narrow angle (10 ° ) fan beam rotation angle/step 10° • Shortest scan time was about 18 s per slice

  5. Third Generation Scanners • Linear array of about 800 detectors, single x-ray tube, rotate/rotate motion only, wide fan beam to cover the entire patient • Scan time of newer scanners is about ½ s per slice • Can produce ring artifacts

  6. Fourth Generation Scanners • Complete circular array of about 4800 stationary detectors • Single x-ray tube rotates with in the circular array of detectors • Wide fan beam to cover the entire patient • Scan time of newer scanners is about ½ s per slice • Designed to address ring artifacts

  7. Fifth Generation Scanners • 210° arc array of stationary detectors • x-rays are produced from the focal track as high energy electron beam strikes the tungsten target • Scan time is about 50 ms per slice • Developed for cardiac tomographic imaging

  8. Three major components of EBCT scanner: A – Electron gun B- Tungsten targets C - Detectors

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