CT Generations

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Last updated 2:28 PM on 8/19/26
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7 Terms

1
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A thin x-ray beam passed linearly over the patient, and a single detector followed on the opposite side of the patient. Translate-Rotate

1st generation, pencil beam

2
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The x-ray beam passed linearly across the patient before rotating, a fan-shaed x-ray beam was used. Translate-Rotate

2nd generation, fan beam

3
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The beam and detector move in a circle within the gantry, detector array is curved. Rotate-Rotate

3rd generation, cone beam

4
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The detector is fixed in a 360 degree circle within the grantry, emerging beam does not strike the detectors at the same time causing motion artifacts. Rotate-only or Rotate-fixed

4th generation, cone beam

5
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Fast scanning, ideal for cardiac imaging, poor spatial resolution. Electron Gun as X-ray Source.

5th generation, Electron Beam CT (EBCT)

6
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Two tubes offset by 95 degrees, can set two different kVps to accomidaye different tissue structures. Dual source scanners

6th generation, cone beams

7
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Uses flat panel detector instead of multi-row detectors. Rotate-Rotate.

7th generation, Cone Beam