.IS THIS A FOURIER TRANSFORM (Y/N)?: Y
[If the input file is a Fourier transformed Radon transform
answer Y. Currently there is no information in the file
header of Radon transforms that identify if it is in real
or Fourier space.]
.OUTPUT FILE: RECON001
[Enter name of output file.]
.INTERMEDIATE OUTPUT FILE: F_INTER001
[Enter name of file to store intermediate volume. This file
is only being used if the memory requirements of the
program are larger than the memory provided. If the file
name, however, has an "_" (underline) in the second
position, the intermediate output file is used regardless
of memory size. This option can be quite helpful if intermediate results are of interrest. The content of this volume
are the projections in a single axix tilt series around y.]
.ENTER X,Y DIMENSIONS: 64,64
[Enter the x and y dimensions of the backtransformed volume.]
.ENTER Z DIMENSION: 64
.OBJECT DIAMETER: 60
[Enter diameter of reconstructed object.]
.INCLUDE LOW-PASS FILTER(Y/N): N
[The underlying algorithm is a filtered backprojection. If "Y"
is answered here, then the weighting funtion is multiplied with
a Fermi filter (s. FF) with a radius corresponding to Crowther's
formula.]
.OBJECT DIAMETER: 50
[Enter the diameter of the object in the output image. If
this is not known, use the longer of the image dimensions.]
.WEIGHTING FUNCTION DOC-FILE: WDOC001
[Enter the name for a document file that will contain the
weighting function. This can be used e.g. to produce a plot
of this function. It will be well behaved up to the resolution
limit defined by Bracewell's/Crowther's formula: N=pi*D/r.]
.INCLUDE LOW-PASS FILTER (Y/N)?: Y
[If Y is answered a fermi low-pass filter will be applied to the
weighting function. The radius of this filter is calculated from
Crowther's formula.]
NOTES