Which imaging modality utilizes a moving laser beam?

In the context of imaging modalities, CR imaging, or Computed Radiography, utilizes a moving laser beam as part of its operation. CR systems employ photostimulable phosphor plates to capture images. After exposure to X-rays, these plates store the energy temporarily and must undergo processing to retrieve the image. This is where the moving laser beam comes into play: the plates are scanned by a laser, which excites the stored energy and releases light. This emitted light is then captured and converted into a digital image for interpretation.

The other modalities listed do not use a moving laser beam in the same way. MRI uses strong magnetic fields and radio waves to create images of the body's internal structures. A CT scan employs a rotating X-ray source and detectors to produce cross-sectional images but does not involve a laser. Conventional X-ray imaging relies on fixed sources of X-rays to create images on film or digital detectors, with no movement of a laser in the process. Therefore, CR imaging stands out due to its unique technique of utilizing a moving laser beam for image capture.