ASTRA toolbox training school for X-ray tomography, Antwerp, April 5-7, 2017.

Dates: 
Thursday, April 6, 2017 - 23:45

This dedicated EXTREMA training school will take place at the Vision Lab of the University of Antwerp and will be co-organized by CWI, Amsterdam. In a three day program, the trainees are introduced to advanced tomographic reconstruction using the ASTRA toolbox (http://www.astra-toolbox.com), a flexible open source platform for tomography.

The EXTREMA COST Action provides trainee grants for a limited number of participants.

Interest in this training school? You're welcome to subscribe by sending an email to jan.sijbers@uantwerp.be

Visual analysis of dynamic processes

The workshop on “Visual analysis of dynamic processes” is a follow-up of the mini-workshop on data handling and treatment at the 10th World Conference on Neutron Radiography in Grindelwald, Switzerland, in October 2014 and the Lorentz Workshop on Quantitative 3D X-Ray Imaging in Leiden, the Netherlands in January 2016. During those workshops many questions were raised regarding visual analysis of dynamic processes but only few solutions were provided. The key idea of this workshop is to bring together the communities of researchers working with X-ray and neutron CT and the communities of visual data analysis. In fact, even though at different time scales the final goal is a precise interpretation of noisy data through analysis and visualization procedures.

Today, there is a clear trend emerging towards quantitative and in-situ imaging of dynamic processes. Especially in neutron and X-ray computed tomography (CT) this trend demands the integration of computation and visualization steps with data acquisition to provide the information of interest. The motivations behind are manifold and integrate the following aspects: on one side the acquisition of tomographic projections, or radiographs, and the following reconstructed slice only provide intermediate information, which requires additional data processing to extract the targeted physical parameters (quantitative imaging), on the other side, there is a strong demand to reveal the information that is contained in the images which is hidden, because of noise or artefacts, in the sheer amount of data. The required data enhancement will make it possible to push the instrument performance beyond the limitations of the instrument hardware itself.

Website of the workshop: https://indico.psi.ch/conferenceDisplay.py?confId=4840

Dates: from 9 January 2017 08:00 to 11 January 2017 16:00
Timezone: Europe/Zurich
Location: Rigi Kulm
Chairs: Dr. Kaestner, Anders and Dr. Marone, Federica

International Workshop on Process and Biomedical Tomography

On November 7-9, the International Workshop on Process and Biomedical Tomography (ProBioTo2016) will take place, which is a scientific conference organized at Warsaw University of Technology (Warsaw, Poland). The event is part of the activities of the EU COST Action MP1207: EXTREMA - Enhanced X-ray Tomographic Recontruction: Experiment, Modeling and Algorithms.

The workshop brings together academic and industrial experts on tomography with a two-fold goal:

  • transfer the latest scientific research results into commercial research and development pipeline,
  • educate the academic community about the current industrial and biomedical communities needs related to tomography.

We hope to welcome you in Warsaw. More info can be found at: http://extrema2016.po.opole.pl/

Focused workshop on Region of Interest X-ray Computed Tomography

To satisfy the heterogeneous needs of X-ray CT users, flexible solutions are required both from the hardware and software point of view. The use of synchrotrons and microfocus X-ray sources present complementary approaches being characterized by different properties in terms of achievable spatial resolution, field of view and image contrast. The main aim of this event was to bring together experimentalists, mathematicians and computing scientists and explore this specific topic in Computed Tomography (CT) data collection and reconstruction. This focused meeting hosted a small group of mathematicians and computational scientists at the Elettra - Sincrotrone Trieste laboratory (Italy) with the aim to study in detail the Region-Of-Interest (ROI) problem in CT. This workshop has been organized as a follow-up of the Lorentz 2015 workshop focusing our attention on the specific topic of ROI-CT. In fact, ROI-CT reconstructed images are often corrupted by artefacts that, in some cases, mask part of the information contained in the image itself. Find solutions require a full comprehension of the origin of these artefacts. Micro-CT data were analyzed on site having the ability to acquire the data at varying contrast and spatial resolutions and on different instruments. The whole object has been imaged at medium spatial resolution by using a conventional CT instrument based on a microfocus source (http://www.elettra.trieste.it/lightsources/labs-and-services/tomolab/tom...) and then a selected ROI has been selected and imaged at higher spatial resolution. A similar approach has been adopted at the SYRMEP beamline of Elettra (http://www.elettra.trieste.it/elettra-beamlines/syrmep.html) where a micro-CT instrument allowing to work at higher spatial resolution and based on a synchrotron source is available. A mixed approach employing the conventional and synchrotron sources for the same object has been also explored.
The workshop has been co-funded by the EXTREMA COST Action, an European research network focused on advanced X-ray tomography and was attended by10 participants from several European countries. The Scientific Program of the workshop can be found at the link: http://www.elettra.trieste.it/Conferences/2015/ROI-CT/index.php?n=Main.Program . During the first day of the workshop 5 invited speakers have presented their work in the field of ROI-CT and the talks have been followed by 25 participants.

More info on:
https://confluence.aps.anl.gov/pages/viewpage.action?pageId=26640411

mini-workshop on “Finding approaches to eliminate artefacts in x-ray phase contrast computed tomography”, September 16-18 2015, UCL London

Dates: 
Wednesday, September 16, 2015 - 23:45

X-ray phase contrast (PC) computed tomography (CT) has been heavily investigated over the last two decades. It holds potential to overcome the major limiting factor of conventional CT: poor contrast for soft biological tissues. This is because contrast in PC-CT is driven by phase effects rather than attenuation ones, which can be several orders of magnitude stronger than the latter. PC-CT is typically implemented using propagation-based, crystal-based or grating-based approaches. These methods, however, rely either on spatially or temporarily coherent or quasi-parallel beams. These conditions are only met at synchrotrons, or, to some extent, by micro-focal x-ray tubes. The use of synchrotrons and micro-focal x-ray tubes is not suited to many practical applications due to accessibility and x-ray flux constraints, respectively. At UCL, new approaches to PC-CT have been developed, named edge illumination PC-CT, which has been demonstrated in several instances to work well with x-ray tubes with relatively large focal spots, i.e. in a scenario that is closer to practical reality.

This workshop was primarily aimed at a) identifying the origin of artefacts in edge illumination PC-CT images and b) at finding approaches towards their elimination, but also at c) gaining insight about image acquisition and reconstruction techniques employed by other groups, and d) at identifying possible future collaborations.

Local Organizers: Charlotte Hagen and Anna Zamir

The EXTREMA COST Action provided reimbursement for 5 participants, covering travel and lodging costs and Local Organizer Support.

Workshop on Experimental and Computational Tomography, ESRF Grenoble, 18-20 May 2015.

Dates: 
Monday, May 18, 2015 - 23:45

The ESRF workshop was intended to bring together experimental and computational scientists involved in advanced X-ray tomography in the state-of-the-art synchrotron X-ray imaging environment of ESRF.
The program centered around three challenging topics, for which datasets have been made available before the workshop: (i) combined phase retrieval and tomography; (ii) region-of-interest tomography; (iii) limited data and low-dose tomography. A unique feature of this workshop was the hands-on program on the first day, where the participants experienced the actual imaging process at various synchrotron tomography beamlines.
Local organizers: Wolfgang Ludwig, Peter Cloetens, Claudio Ferrero

The EXTREMA COST Action provided reimbursement for 19 participants, covering travel and lodging costs and Local Organizer Support, for a total of € 17.762,80.

Meeting on Tomography and Applications, Milano, April 20-22 2015.

Dates: 
Monday, April 20, 2015 - 23:45

This meeting combined lectures and discussion on a broad range of theoretical, computational and experimental aspects of tomography. Several EXTREMA members participated in the meeting, from various backgrounds. The meeting was not COST-only, and as such it allowed to introduce our network to a partially new audience. MP1207 provided participant reimbursement for 7 participants and Local Organiser Support.

Local organizers: Paolo Dulio and Carla Peri

The EXTREMA COST Action provided reimbursement for 14 participants, covering travel and lodging costs and Local Organizer Support, for a total of € 11.857,33.

Lorentz Workshop on “Artefacts in X-ray tomography”, Leiden, 9-13 February 2015.

Dates: 
Monday, February 9, 2015 - 23:15 to Friday, February 13, 2015 - 23:30

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 https://confluence.aps.anl.gov/display/XSDLORENTZ2015/Artefacts+in+X-Ray...

Organizing committee: Joost Batenburg, Francesco de Carlo, Lucia Mancini, Jan Sijbers

The EXTREMA COST Action provided reimbursement for 22 participants, covering travel and lodging costs and Local Organizer Support, for a total of € 20.612,98.

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