**Abstract:** This paper presents a fast maximum intensity projection
technique based on binary shear-warp factorization. The proposed method
divides the density domain into a small number of intervals, and to each
interval a binary code representation is assigned. In a preprocessing step,
an additional volume is created which contains for each voxel the code
of the interval enclosing the given voxel density. We present an appropriate
data structure for storing this volume and an efficient lookup table technique
which can be used to rapidly access a voxel of a certain density code.
The volume is efficiently resampled along viewing rays only in voxels where
the densities reside in the interval which contains the appropriate maximum
value.