Usefull Reference: Fundamentals of three-dimensional reconstruction from projections. Penczek PA. Methods Enzymol. 2010; 482: 1-33
In SPIDER operations that reconstuct a volume from its projections are grouped under back projection irrespective of whether the method entails a actual 'back projection' step.
| Operation | Operation Subset volumes | Input angles | Symmetries | Method | Interpolation | Weighting | Notes | Source code |
|---|---|---|---|---|---|---|---|---|
| 'BP 3F' | 'BP 32F' | 3 | + | Direct Fourier | 5x5x5 Kaiser-Bessel | - | 1 or 3 output volumes, MPI available | bp3f.f, bp32f.f, oneline.f |
| 'BP CG' | 'BP CG 3' | 3 | - | SIRT - Conjugate gradient WBP | Linear or FBS | - | 1 or 3 output volumes, MPI available | bpcg.f, prepcub_s.f, hiang.f, rprq.f, prjcq.f, bckpj.f |
| 'BP RP' | 'BP RP 3' | 3 | + | SIRT - Constrained WBP | - | - | MPI available | bprp.f, redprq.f, hiang.f, asta.f, bckpj.f, prjcq.f |
| 'BP 3N' | - | 3 | + | Direct Fourier | Nearest neighbor | - | -- | nn4.f |
| 'BP 3D' | - | 3 | - | WBP | - | Choice of: Gaussian, none, triangular overlap | Also used for tomography | bcq.f, buildm.f, cang.f, bpcqp.f, bpcmp.f, bpcq.f, bpcm.f, wtf.f, wtm.f |
| 'BP W2' | - | Single | - | WBP | - | Parzen | For tomography. Faster then 'BP S2'. | wgbp2.f, rdpa.f, fftr_q.f |
| 'BP S2' | - | Single | - | SIRT - Constrained WBP | - | - | For tomography. Slower than 'BP W2' | bps2.f, bpcq.f, prjs2.f, prjc2.f, prjc0.f, repr2_s.f, cppb.f, smt3.f, ... |
| 'BP R2' | - | None | - | - | R**2 or R*, Parzen | --- | Weights only, No back projection! Use with 'BP RP'. | bpwr.f, bpwr_q.f |
| Operation | Resolution | Time |
|---|---|---|
| 'BP CG' | 17.95 | 531 |
| 'BP 3F' / 'BP 32F' | 23.96 | 128 |
| 'BP 3N' / 'BP 32F' | 23.99 | 25 |
Source file: bp_overview.html Updated: 3 Oct 2012 ArDean Leith