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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
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
The beam and detector move in a circle within the gantry, detector array is curved. Rotate-Rotate
3rd generation, cone beam
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
Fast scanning, ideal for cardiac imaging, poor spatial resolution. Electron Gun as X-ray Source.
5th generation, Electron Beam CT (EBCT)
Two tubes offset by 95 degrees, can set two different kVps to accomidaye different tissue structures. Dual source scanners
6th generation, cone beams
Uses flat panel detector instead of multi-row detectors. Rotate-Rotate.
7th generation, Cone Beam