A tomographic unit using what type(s) of motion must be dedicated to tomographic imaging?

In this context, the question pertains to the types of motion used in tomographic imaging and the requirement for a multipurpose imaging unit. Tomography often necessitates specific movements to acquire cross-sectional images, thus limiting the versatility of the imaging unit.

The types of motion likely referred to involve different mechanisms that can be employed in imaging systems, such as translational motion (moving in a straight line), rotational motion (spinning around an axis), and possibly another distinct type of movement. For an imaging system to be exclusively dedicated to tomographic imaging, it must utilize the motions that facilitate this form of imaging effectively, enabling the required slice-by-slice data acquisition.

The correct answer indicates that only the specific types of motion designated as 2 and 3 are suitable for tomographic imaging. This implies that other types of motion (like the first type mentioned) may not be applicable for this specialized purpose, leading to confusion in the imaging process or inadequate image quality for tomographic objectives.

Understanding that tomographic imaging relies heavily on precise and often intricate motions explains why those particular types of motion are necessary. Adherence to the proper mechanics is essential to achieving the desired diagnostic images with the necessary detail and accuracy typical in tomographic processes.