Final answer:
The distance that the table travels between slices in a CT scan is called collimation. It involves aligning the X-ray beam to improve image quality and reduce radiation exposure.
Step-by-step explanation:
The distance that the table travels between slices is called collimation. Collimation refers to the process of aligning the X-ray beam to ensure accurate and consistent results in CT scans. It helps in reducing the amount of radiation exposure and improving image quality.
For example, in a CT scan, the patient table moves a certain distance between each image slice. The collimation process helps in controlling the width of the X-ray beam, ensuring that only the required area is imaged.