Version 2022.2.0¶
Note
The changelog is available at https://gitlab.esrf.fr/tomotools/nabu/-/blob/master/CHANGELOG.md
Highlights¶
This section highlights some of the available features.
Partial support for cone-beam reconstruction¶
Nabu is now able to reconstruct volumes with a cone-beam geometry, using the astra toolbox under the hood. Interestingly, the full volume does not need to fit in memory: reconstruction can be done by slabs, and the geometry is automatically recomputed for each slab.
This feature is not integrated yet in the pipeline, meaning it’s not available yet in the configuration file.
Volume casting¶
This application is casting a user-provided volume to a given expected volume and an output data type.
SRCurrent normalization¶
In principle, each frame is normalized as
where \(s\) is the synchrotron current for the current frame, \(sMax\) is the max current, and \(D\) is the dark frame.
However the electric current normalization is done during flat-field, lifting the need for knowing \(sMax\):
where \(s_P\) and \(s_F\) are the electric current of projection \(P\) and flat \(F\), respectively.
Normalizing by the synchrotron current eventually boils down to multiply with \(\frac{s_F}{s_P}\) after flat-field.
Configuration templates¶
When generating a new configuration file with nabu-config, you can use templates with pre-filled parameters, depending on your beamline/use-case.
The syntax is nabu-config --template <template_name>. Built-in templates are id19_pag, id16_ctf, id16_holo.
You can also define your own templates: simply save a configuration file in a directory, and use this directory in the NABU_TEMPLATES_DIR environment variable:
NABU_TEMPLATES_DIR="/home/me/nabu_config_templates" nabu-config --template mytemplate
Fixes¶
Improve handling of user-defined values through text file, eg. angles_file
NaN support in flat-field
horizontal/vertical translation in pipeline
Improve results of the “composite-sino-coarse-to-fine” (aka “near”) CoR estimator.