00991naa a2200205 a 450000100080000000500110000800800410001910000260006024501230008626000090020952003180021865300280053665300220056465300180058665300280060465300180063270000210065070000200067177300940069110296642006-03-15       1999    bl ---       0--  u    #d1 aMASCARENHAS, N. D. A.  aTransmission tomography under poisson noise using the Anscombe transformation and Wiener filtering of the projections.  c1999  aA minitomograph scanner for soil science was developed by the National Center for Research and Development of Agricultural Instrumentation (EMBRAPA/CNPDIA). the purpose of this paper is twofold. First, a statistical characterization of the noise affecting the projection measurements of this scanner is presented.  aAnscombe transformation  aEstimation theory  aPoisson noise  aTransmission tomography  aWiener filter1 aSANTOS, C. A. N.1 aCRUVINEL, P. E.  tNuclear Instruments and Methods in Physics Research A, Amsterdamgv.423, p.265-271, 1999.