  The high resolution of the LHCb vertex detector makes it possible to perform
precise measurements of vertices of beam-gas and beam-beam interactions and
allows beam parameters such as positions, angles and widths to be determined.
Using the directly measured beam properties the novel beam-gas imaging method
is applied in LHCb for absolute luminosity determination. In this contribution
we briefly describe the method and the preliminary results obtained with May
2010 data.
