[vtkusers] raw files reades - volumizer

[Christos Panagiotou]

hi

i am trying the past couple of days to volumize a set of raw data files 
containing medical data
the files represent images of
size 256x256
binary (0-255)
spacing 2.5
voxel size (x,y) 1.1211
(the above data comes from an independent header file / raw files -> no 
header)

first of all which reader should i use?
vtkImageReader, vtkImageReader2, vtkBMPReader, ...?

if someone has already some code that does something similar, i would 
appreciate if he/she could share it

thanks
christos