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(a) First-generation CT geometry. In this example, the rotation increment is 1 deg. (b) Second-generation CT. In this example, six detectors span 6 deg, accelerating scanning by a factor of 6. (c) Hounsfield and Ambrose next to an EMI CT1010, an early second-generation head scanner. Graphic drawings are from Ref. 10. Image is from Ref. 26.
