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Artefacts in X-Ray Tomography
Lorentz Workshop “Artefacts in X-ray Tomography”
February 9-13 2015, Lorentz@Oort.
Significant progress has been made in recent years in the ability to perform advanced 3D X-ray imaging for scientific, industrial and medical applications. The quality of such images is often limited by the presence of certain structured distortions, known as “artefacts”. Artefacts can have a broad range of causes, related to the experimental setup, but also to the computations performed on the measured data. The main goal of this Lorentz Center Workshop was to initiate an in-depth discussion on the various artefacts that arise in X-ray tomography.
The workshop brought together around 55 participants from different communities (mathematical, computational, engineering, photonics, experimental) involved in tomography. From the first day and onwards, there was a strong urge among the participants to zoom into concrete problems and exchange experiences related to these problems.
Several discussion groups on selected topics were formed during the week:
1. Region-of-Interest Tomography
2. X-ray micro-CT
3. Full system calibration
4. Fluid flow reconstruction in CT
5. Reconstruction from limited and noisy data
6. Correction for motion introduced during acquisition
7. Quality measures for tomography scans
Before the workshop, Francesco de Carlo compiled a repository of experimental synchrotron datasets that served as a basis for many of the discussions.
A particular successful item in the program was the speeddating session, where participants were teamed up in pairs for 3-minute discussions. Although no one knew what to expect, it was highly valued by most participants as a good means of creating new contacts.
As a platform for shaping the newly formed collaborations, a web repository was set up for the different topics treated during the workshop, which can be found at
This workshop was partially funded by the EU EXTREMA COST Action, a network grant for advanced tomography. The next challenge will be to transform the discussion results into concrete computational/experimental solutions for various types of artefacts. On 18-20 May 2015, there will be a follow-up workshop at the European Synchrotron (ESRF) in Grenoble. This will include simultaneous availability of three experimental beamlines, creating a unique experimental/computational event.
Overall, the workshop was received in a very positive way. Due to a major local outbreak of a flu-like virus, about half the participants suffered from sickness during the week. On one hand, this caused difficulties, but at the same time it created a special atmosphere where the group felt united in its struggle against the elements.
- Joost Batenburg (Amsterdam, The Netherlands)
- Francesco de Carlo (Argonne, United States)
- Lucia Mancini (Basovizza, Italy)
- Jan Sijbers (Wilrijk, Belgium)