Acquisition, optimization and interpretation of X-ray computed tomographic imagery: applications to the geosciences

High-resolution X-ray computed tomography (CT) is a novel technology ideally suited to a wide range of geological investigations. It is a quick and nondestructive method to produce images that correspond closely to serial sections through an object. Sequential contiguous images are compiled to create three-dimensional representations that can be manipulated digitally to perform efficiently a large array of measurement and visualization tasks. Optimal data acquisition and interpretation require proper selection of scanning configuration, use of suitable X-ray sources and detectors, careful calibration, and attention to origins and modes of artifact suppression. Visualization of CT data typically profits from the ability to view arbitrarily oriented sections through the three-dimensional volume represented by the data. and from the capability to extract features of interest selectively and display perspective Views of them using methods of isocontouring or Volume rendering. Geological applications include interior examination of one-of-a-kind fossils or meteorites; textural analysis of igneous and metamorphic rocks. geometric description and quantification of porosity and permeability in rocks and soils; and any other application demanding three-dimensional data that formerly required physical serial sectioning. (C) 2001 Elsevier Science Ltd. All rights reserved.