.FILE NUMBERS: 1-20,33,45-128
[Enter number of files containing projections.]
.SLICE NUMBER, RADIUS OF RECONSTRUCTED CIRCLE: 23,52
[Enter number of slice to be reconstructed and the radius
of the reconstructed circle.]
.SEARCH DIRECTIONS, ENTROPY TYPE: 3,1
[Number of gradient search directions for the optimization program:
only 3, 4 or 6 is allowed. Three directions are sufficient.
Entropy type determines the definition of the entropy to be used:
0 - fixed default value - the average of the reconstructed image is kept constant and equal to the default value;
1 - variable average, no default value needed;
2 - not supported;
3 - not supported;
4 - values of reconstructed object are kept 0<f<1 at fixed default value. This option can be treated as the constraint of maximum value of the reconstruction provided that the projections are scaled properly.]
.C_AIM, VARIANCE: 1000,1
[C_aim is the expected chi-squared error used for convergence
test. Variance is the error of each pixel. Only a constant error
model is used. Note that the two numbers are related.]
.STARTING VALUE, DEFAULT VALUE: 0.1,0.2
[Starting value used as a background for the reconstructed image.
It must be positive. A good guess is 1/N, where N is the number of
reconstructed pixels.
Default value is used for maximization of entropy type 0 or 4.]
.ITERATION LIMIT, CONVERGENCE TEST: 100,1
[Iteration limit prevents excessively long calculations.
Convergence test defines the stopping criterion used:
1 - C <= 1.005*C_aim or TEST <= 0.01;
2 - as in opt. 1, but stop after 8 iterations if TEST starts increasing;
3 - as in opt. 1, but stop if C changes by less than 1%.]
.PRINT INFORMATION EACH ITERATION STEP (Y/N): N
[Self-explanatory.]
.SCALING FACTOR: 1.0
[Projections are multiplied be this factor. It simplifies
adjustment of the projections' values to obey constraints.]
.RECONSTRUCTED 2-D FILE: SLI023
[Name of output file.]
NOTES