5.2 CT: image quality and artifacts Flashcards

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1
Q

how many generations of CT scanners are there?

A

4
(pencil beam 1790, partial fan beam 1972, fan beam 1976, fan beam 1978)

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2
Q

which generation of CT scanners started using multiple detectors instead of just one?

A

2nd generation

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3
Q

which generation of CT scanners did we observe a significant improvement in duration of scan?

A

2nd generation

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4
Q

what was the “number of detectors” for each generation of CT scanners?

A

1st: one
2nd: multiple, up to 30
3rd: multiple, 288-700
4th: multiple, more than 2000

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5
Q

what was the “type of beam” for each generation of CT scanners?

A

1st: pencil-like x-ray beam
2nd: fan-shaped x-ray beam
3rd: fan-shaped
4th: fan-shaped

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6
Q

what were the “tube-detector movements” for each generation of CT scanners?

A

1st: translate-rotate
2nd: translate-rotate
3rd: rotate-rotate
4th: rotate-fixed

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7
Q

what is the “average duration of scan” for each generation of CT scanners?

A

1st: 25-30 mins
2nd: less than 90 sec
3rd: 5 sec
4th: few secs

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8
Q

describe the difference of tube-detector movements between the 3rd and 4th generation of CT scanners

A

3rd gen: detectors rotate together with the x-ray tube
4th gen: fixed detectors, rotation of only the x-ray tube

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9
Q

does a higher generation of CT scanners mean it is more advanced?

A

no, the 3rd gen is still used to today in some cases rather than 4th gen

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10
Q

what is a characteristic of ALL CT systems when it comes to x-ray tubes and detectors

A

in all systems, there is only ONE x-ray tube, and many detectors

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11
Q

what are the 2 types of beam?

A
  • multiple pencil beams
  • small fan beams
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12
Q
A
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