Correct Answer: C
Explanation:
High-resolution X-ray CT (Computed Tomography) is a completely nondestructive technique for visualizing features in the interior of opaque solid objects, and for obtaining digital information on their 3-D geometries and properties. It is useful for a wide range of materials, including rock, bone, ceramic, metal and soft tissue. High-resolution X-ray CT differs from conventional medical CAT-scanning in its ability to resolve details as small as a few microns in size, even when imaging objects made of high density materials.
As the X-rays pass through the object being scanned, the signal is attenuated by scattering and absorption. The measurement is obtained by the relative attenuation.