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(a) Third-generation CT acquires data by rotation of a fan beam source rigidly coupled to a detector array. (b) In a fourth-generation scanner, the fan beam source rotates inside a stationary detector ring. A detector cell measures an inverse fan of data as the source rotates (shaded). (c) Image of the AS&E gantry. Graphic drawings are from Ref. 10. Image is from AS&E brochure.
