\input zb-basic \input zb-ioport \iteman{io-port 00541528} \itemau{Natterer, Frank} \itemti{Determination of tissue attenuation in emission tomography of optically dense media.} \itemso{Inverse Probl. 9, No.6, 731-736 (1993).} \itemab In emission tomography of optically dense media a certain integral equation arises. It is the problem of determining the attenuation distribution which must be taken into account when setting up the equations from which the activity distribution is computed. A method for computing the attenuation distribution from the emission data is presented. \itemrv{L.Hacia (Pozna\'n)} \itemcc{} \itemut{emission tomography; optically dense media; attenuation distribution} \itemli{doi:10.1088/0266-5611/9/6/009} \end