Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
In radiology, an axial image is one obtained by rotating around the axis of the body, producing a transverse planar image, that is, a section transverse to the axis. /axÂ·iÂ·al/ (akÂ´se-al) of or pertaining to the axis of a structure or part.