Name

prep_vol - prepare the volume for calculation of gridding projections and generate the interpolants.

Usage

volft, kb = prep_vol(vol) or volft, kbx, kby, kbz = prep_vol(vol)

Input

vol: input volume for which projections will be calculated using prgs, the volume can be either cubic or rectangular

Output

volft: volume prepared for gridding projections using prgs
kb: interpolants (tabulated Kaiser-Bessel function) when the input volume is cubic.
kbx, kby, kbz: interpolants (tabulated Kaiser-Bessel function) along x,y and z direction when the input volume is rectangular.

Method

Fourier space interpolation.

Reference

Penczek, P.A., Renka, R. and Schomberg, H.: Gridding-based direct Fourier inversion of the three-dimensional ray transform. J. Opt. Soc. Am. A. 21:499-509, 2004.

Author / Maintainer

Pawel A. Penczek

Keywords

category 1: TRANSFORMS
category 2: FOURIER

Files

projection.py

Maturity

stable: works for most people, has been tested; test cases/examples available.

Bugs

None. It is perfect.