Schematic geometry of x-ray refraction in a medium for cone-beam DPC-CT.

Abstract

<p>(<i>x</i>^′,<i>z</i>^′) represents the coordinates of the detector plane. <i>OAC</i> is the mid-plane. <i>D</i> is the distance from the source to the rotation center <i>O</i>. <i>θ</i> represents the view angle under which the data was taken. <i>l</i> is any incident ray in the three dimensional space under <i>θ</i>. <i>P</i> is the line integral of <i>δ</i> along <i>l</i>.</p