Summary

AstraReconCpu

Process category

Brief description

Computational demand

for typical tomography data

(low, medium, high)

Comment(s)

Reference(s)

Common alternative process(es)

reconstructor

To reconstruct normalised and conditioned data.

Depends on the reconstruction algorithm selected.

Uses CPU resources.

The Astra Toolbox

AstraReconGpu
TomopyRecon

Parameters

Brief description

Savu Configurator command

>>> disp -avv

-------------------------------------------------------------------------------------
 2) AstraReconCpu(savu.plugins.reconstructions.astra_recons.astra_recon_cpu)         
  Wrapper around the Astra toolbox for cpu reconstruction.                           
    1)               init_vol : None
    Dataset to use as volume initialiser (doesn't currently work with preview).
    2)                    log : True
    Take the log of the data before reconstruction (True or False).
    3)              algorithm : FBP
    Reconstruction type (FBP|SIRT|SART|ART|CGLS|FP|BP|).
    4)           n_iterations : 1
    Number of Iterations - only valid for iterative algorithms.
    5)                preview : []
    A slice list of required frames.
    6)     centre_of_rotation : 0.0
    Centre of rotation to use for the reconstruction.
    7)            in_datasets : []
    Create a list of the dataset(s) to process.
    8)                  ratio : 0.95
    Ratio of the masks diameter in pixels to the smallest edge size along given axis.
    9)           out_datasets : []
    Create a list of the dataset(s) to create.
   10)             centre_pad : False
    Pad the sinogram to centre it in order to fill the reconstructed volume ROI for
    asthetic purposes. NB: Only available for selected algorithms and will be ignored
    otherwise. WARNING: This will significantly increase the size of the data and the
    time to compute the reconstruction).
   11)              outer_pad : False
    Pad the sinogram width to fill the reconstructed volume for asthetic purposes.
    Choose from True (defaults to sqrt(2)), False or float <= 2.1. NB: Only available
    for selected algorithms and will be ignored otherwise. WARNING: This will
    increase the size of the data and the time to compute the reconstruction).
   12)               log_func : np.nan_to_num(-np.log(sino))
    Override the default log function.
   13)             force_zero : [None, None]
    Set any values in the reconstructed image outside of this range to zero.
   14)              projector : line
    Set astra projector (line|strip|linear).
-------------------------------------------------------------------------------------

>>>

Additional notes

For basic information on this process, please use the disp -av (or disp -avv or disp -v[v] <process index>) command in Savu Configurator (see above). The table below is intended to provide some additional notes on a number of selected topics:

Item	Parameter name	Parameter format	Example(s)		Comment(s)
Item	Parameter name	Parameter format	Parameter value	Effect	Comment(s)
1	init_vol
2	log				The *log* parameter needs to be set to False, if PaganinFilter is applied beforehand.
3	algorithm
4	n_iterations
5	preview
6	centre_of_rotation				The default value of the *centre_of_rotation* parameter is 0.0, which normally needs to be manually modified to a more appropriate value or, if VoCentering is used beforehand in the process chain, then this parameter is automatically set to a value determined by this auto-centring process.
7	in_datasets
8	ratio
19	out_datasets
10	centre_pad
11	outer_pad
12	force_zero
13	projector

Usage

TBC.

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