Version 2024.2.0

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.

New fast reconstruction method

This new version ships a faster-than-FBP method for reconstruction: HierarchicalBackprojector, from nabu.reconstruction.hbp. It works by applying FBP recursively on sub-images, in a “divide-and-conquer” scheme. This will yield an approximate reconstruction, but the accuracy is usually enough for most cases. It’s typically 5-10X faster to reconstruct huge slices.

In the configuration file, it can be used with method = HBP in the [reconstruction] section.

Cone-beam reconstruction

There are various improvements for the cone-beam reconstruction (used with method = cone in [reconstruction] section):

  • Filters other than “ramlak” can now be used

  • Advanced options like padding mode, horizontal translations, slice ROI… are now supported

  • It provides results consistent with FBP regarding scaling and angular convention

New center of rotation estimator

A new center of rotation (CoR) estimator is available: method = vo, using the method developed by Nghia Vo in algotom. This will make a fine addition to our (already large) collection.

Miscellaneous improvements

  • VKFFT is now the default FFT implementation. This normally yields faster processing, with significantly lower memory footprint

  • New data readers (NXTomoReader and EDFStackReader) are now used by the full-field pipeline. They are simpler and more efficient.

  • Stitching:

    • Generalize pre-processing stitching. Create dedicated stitching for y-stitching on NXtomo(s).

    • Rework calculation of final position

Fixes

  • Fix translation_movements_file when used alongside projections subsampling

  • Fix radios rotation when reconstructing only one slice

  • Fix crash when method = none in [reconstruction] (i.e don’t do the reconstruction, only pre-process the data)

  • Many fixes for cone-beam pipeline (see above)