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

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Presentation on theme: "Historical Development CT scanners are categorized into several generations depending on the type of detectors, scanning method etc."— Presentation transcript:

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

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4 First generation model of a CT head scanner

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7 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

8 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

9 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

10 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

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

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