OPTICAL TOMOGRAPHY FOR 3-DIMENSIONAL SPECTROSCOPY

The optical implementation of the tomography technique developed for X-ray computer-aided tomography (CAT) analysis is one method that allows non-invasive separation of the information within a specimen's axial area. This may be achieved by rotating the specimen with respect to the imaging system and acquiring images at multiple perspectives. The multiperspective images are reassembled by a computer program to obtain a quantitative three-dimensional map of the specimen. The reconstruction methods rely on the assumption that rays propagate in a straight line through the sample. The concepts in optical tomographic reconstruction are described, with a view to laying the foundation for reconstruction with nondistorted optical ray paths.