Page 335 - Biomedical Engineering and Design Handbook Volume 2, Applications

THE PRINCIPLES OF X-RAY COMPUTED TOMOGRAPHY 313

FIGURE 10.58 Soft-solid four-phase composite material. (a) Three-dimensional reconstruction; (b) two-dimensional slice.

back-projected frames using the Feldkamp cone-beam algorithm, with a resolution of 512 × 512 pixels
per frame.
The material was initially chilled to −20°C and subsequently warmed to −10°C. The alteration in
the air cell network (black) and the structural rearrangement of the ice plus matrix phase (white) with
temperature rise is clearly defined. To provide quantitative measurement of microstructural detail,
the volume is sliced across a region of interest (Fig. 10.58b). Here, the slice pixel size is 5 mm for a
projection magnification of ×18.