  We present preliminary results of 2D radiative modelling of He I lines in
solar prominences, using a new numerical code developed by us (Leger,
Chevallier and Paletou 2007). It treats self-consistently the radiation
transfer and the non-LTE statistical equilibrium of H and, in a second stage,
the one of He using a detailed atomic model. Preliminary comparisons with new
visible plus near-infrared observations made at high spectral resolution with
THeMIS are very satisfactory.
