LOCAL TOMOGRAPHY

Tomography produces the reconstruction of a function f from a large number of line integrals of f. Conventional tomography is a global procedure in that the standard convolution formulas for reconstruction at a single point require the integrals over all lines within some plane containing the point. Local tomography, as introduced initially, produced the reconstruction of the related function LAMBDA-f where LAMBDA is the square root of -DELTA, the positive Laplace operator. The reconstruction of LAMBDA-f is local in that reconstruction at a point requires integrals only over lines passing infinitesimally close to the point, and Af has the same smooth regions and boundaries as f However, LAMBDA-f is cupped in regions where f is constant. LAMBDA-1f, also amenable to local reconstruction, is smooth everywhere and contains a counter-cup. This article provides a detailed study of the actions of LAMBDA and LAMBDA-1, and shows several examples of what can be achieved with a linear combination. It includes the results of x-ray experiments in which the line integrals are obtained from attenuation measurements on two-dimensional image intensifiers and fluorescent screens, instead of the usual linear detector arrays.