.(W)EIGHTING- OR (T)RANSFER-FUNCTION: W
[Enter W if you want to calculate the weighting function, T
if you want to calculate the transferfunction of the
back-projection.]
If W was answered:
.CRITICAL VALUE FOR W: 0.6
[Enter a threshold level for the weighting function. I.e.
every value in the weighting function that is below the
"critical value" is replace by it.]
.3D VOLUME DIAMETER: 64.0
[Enter the ray lenght for the simple backprojection. This is
the width of the step function or the halfwidth of the
Gaussian function that limits the back-projection ray in
real space.]
.GENER.ANGLES IN (L)ABEL,(D)OCF,(E)XTERNAL: L
[Angles of the projections can be provided in the header
(L)abel of the projection files or by a document file or
external.]
.FILE NUMBERS OF PROJECTION FILES: 1-5
.TEMPLATE OF PROJECTION FILE SERIES: PRN001
.INPUT FILE: volume001
[You can enter the name of a Fourier transform of a volume
to which the weighting function is then applied. This file
needs to be in the simple format 3D Fourier format (see CP
SF3). If the answer is "*" then the function will only be
calculated but not applied.]
.WEIGHT FILE: weight001
[Enter name for 3D weighting function]
If no input 3D file was given, then the program needs to know the dimensions:
.NSAM,NROW: 66 64
.NSLICE: 64
[Note that the function also will be stored in sinple 3D
Fourier format. NSAM needs to be 2 point larger than the
real space value.]