Final answer:
b) Filtered backprojection is an algorithm used in CT scans to remove artifacts and noise, enhancing image quality.
Step-by-step explanation:
The term referring to the automatic removal of artifacts that occur in anatomy of various densities, especially in the context of imaging techniques such as CT scanning, is filtered backprojection. This process is used to improve the quality of the images produced by these scans. Filtered backprojection is an algorithm that applies a filter to the projections before they are backprojected onto the image plane, significantly reducing the noise and improving image clarity.