Which type of x-ray uses a rotating source to create a three-dimensional image?

The correct answer is cone beam CT, which utilizes a rotating x-ray source and a flat-panel detector to capture multiple images of a structure from different angles in a single rotation. This technique specifically offers the advantage of producing high-resolution three-dimensional images, particularly useful in dental and orthopedic applications. The rotation of the x-ray source allows for a conical shape of the x-ray beam, which enhances the volumetric data collected and subsequently enables detailed reconstruction of the scanned area in three dimensions.

In contrast, traditional x-ray relies on a stationary source and produces flat two-dimensional images, while computed tomography (CT) also involves a rotating source but typically uses a fan-shaped beam that produces cross-sectional images rather than volumetric data as in cone beam CT. Magnetic resonance imaging (MRI) is a completely different imaging modality that uses magnetic fields and radio waves rather than x-rays. Therefore, cone beam CT stands out as the only option that utilizes a rotating source to generate three-dimensional images effectively.