how to reconstruct 3d volume from 2d ct slices with its header information?

Hello I want to reconstruct 3d volume from 2d dicom slices. I had written a code in Matlab successfully. But I don't know how to use the standard information for a given 3d volume. for example, the spacing between slices, voxel spacing etc. The example of this information is given below... thanks.

[Rik]

Usually, people just make a contiguous, square 3D matrix to contain the data, and use the positional information only when they have to.