In order to include the molecular interference effect, a simple procedure i
s proposed and demonstrated to be able to update the usual cross section da
tabase for photon coherent scattering modelling in Monte Carlo codes. This
effect was evaluated by measurement of coherent scattering distributions an
d by means of a model based on four basic materials composing biological ti
ssues, (C) 2001 Elsevier Science Ltd. All rights reserved.