Final answer:
The first generation of CT scanners used a single, or fan-shaped, x-ray beam and a single detector. The second and third generations used a curved array of rotating detectors. The fourth and fifth generations did not introduce this feature.
Step-by-step explanation:
The first generation of CT scanners used a single, or fan-shaped, x-ray beam and a single detector to capture image data. The second and third generations used a curved array of rotating detectors, with the second generation utilizing multiple detectors and the third generation using a rotating fan beam. The fourth and fifth generations of CT scanners introduced improvements in detector technology and image reconstruction algorithms, but they did not specifically introduce the use of a curved array of rotating detectors.