f Algebraic reconstruction for 3D seismic quality control

Derived from medical applications, algebraic reconstruction techniques (ART) were first implemented by geophysicists for crosswell tomography (Bois et al, 1972 ; Bishop et al, 1985 ; Paulson et al, 1985; lvansson, 1985). 2-D refraction cases were recently studied (krajewski et al, 1989 ; Ruhl and Luschen, 1989), using a particular ART variant known as Simultaneous Iterative Reconstruction Technique (or SIRT), whereby each model bin slowness is modified when all raypaths pertaining to that bin have been taken into account .