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BP 3 - Back Projection - 3D, iterative (ART)

(9/17/94)

PURPOSE

Performs one step of a three-dimensional ART back projection from a series of images taken with arbitrary azimuths PHI and tilt angles THETA.

SEE ALSO

BP 3D [Back Projection - 3D, using Euler angles, ||]
BP 3E [Back Projection - 3D, using Euler angles]
BP CTF [Back Projection - 3D, CTF correction, ||]
BP GW [Back Projection - weighted, arbitrary geometry]
BP GW3 [Back Projection - weighted, arbitrary geometry, 3 angles]
BP MEM2 [Back Projection - 2D maximum entropy method]
BP R2 [Back Projection - 2D, R**2 weighting of the image series]
BP RP [Back Projection - 3D, iterative, with constraints, ||]
BP S2 [Back Projection - 2D, single tilt iterative, with constraints]
BP W2 [Back Projection - 2D, filtered weighted]
BP WX [Back Projection - weighted, X]
BP WY [Back Projection - weighted, Y]
BP XY [Back Projection - simple for single axis & conical tilting]

USAGE

.OPERATION: BP 3,X10
[The optional output parameters specify registers where the sum of the absolute error and the root mean squared error are to be written. This register can be used to follow the progress of the reconstruction.]

.THREED FILE: REC001
[Enter the name of the existing 3-D file containing the current estimate. The file will be modified in each back projection step.]

.PROJECTION FILE: PRO005
[Enter the name of the experimental projection file. Be sure this contains the values for theta and phi in its header. They are written into the header by a previous 'ST' operation, e.g.]
ST

.INPUT FILE: PRO005

A
50,10

NOTES

  1. This program uses the interpolation philosophy of M. Radermacher's projection program.

SUBROUTINES

BPROJ3

CALLER

VTIL2

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