TOMCAT welcomes Gianluca Iori, beamline scientist from BEATS - the new beamline for tomography at the SESAME synchrotron in Jordan, to a 3-month training on beamline operations. Gianluca’s visit is part of the Staff Training (BEATS Work Package 2) organized for BEATS scientific staff and SESAME control engineers. BEATS is a European project, funded under the EU’s Horizon 2020 research and innovation programme and coordinated by the ESRF.
The X-ray Tomography group welcomes Stefan Gstöhl (Post-Doc), Maxim Polikarpov (Post-Doc), Margaux Schmeltz (Post-Doc) and Aleksandra Ivanovic (PhD Student) as new members. The group also thank everybody who helped making it possible for our Post-Docs and PhD student to join PSI amidst the challenges brought by the COVID-19 pandemic.
A fully automatized iterative reconstruction pipeline designed to reconstruct and segment dynamic processes within a static matrix has been developed at TOMCAT. The algorithm performance is demonstrated on dynamic fuel cell data where it enabled automatic extraction of liquid water dynamics from sub-second tomographic microscopy data. The work is published in Scientific Reports on 2 October 2020.
In a recent study, TOMCAT has shown that lossy compression by a factor of at least 3 to 4 of raw acquisitions generally does not affect the reconstruction quality and that higher factors (six to eight times) can be achieved for tomographic volumes with a high signal-to-noise ratio as it is the case for phase-retrieved datasets. This finding is relevant to current challenges on large tomography data management and storage especially at synchrotron facilities. The results of this study was published in Journal of Synchrotron Radiation.
Microcalcifications are the most important indicator in the diagnosis of early breast cancer. The team of X-ray tomography group, in collaboration with Kantonsspital Baden, has carried out a reader study to characterize microcalcifications non-invasively using grating interferometry. This study reveals a potential way to discriminate benign and malignant lesions at early stage.
TOMCAT has a new etcher tool for the fabrication of very high aspect ratio gratings in silicon. The new SPTS Rapier system for silicon deep reactive ion etching just arrived and unpacked from the crate in front of the Laboratory of Micro and Nanotechnology at PSI! We thank the LMN technical staff for the support and the great job of moving in!
Researchers at the X-ray tomography group have expanded the theoretical understanding of dual phase grating interferometry with polychromatic sources. As a result, beam hardening effects can be corrected and a real space correlation function of a sample can be retrieved in dark-field imaging. These are significant steps towards application of the method for the quantitative investigation of microstructures of materials and devices using dual phase grating interferometry. The results of the work were published in Optics Express on June 12, 2020.
Researchers from the TOMCAT beamline have developed a small-angle scattering tensor tomography method to visualize microscopic features within a macroscopic field of view with unprecedented data acquisition speed. The results of the study were published in Applied Physics Letters on April 1, 2020.
In collaboration with clinicians from the Inselspital and engineers of the University Hospital of Bern, the X-Ray Tomography Group will be part of a new SNF project entitled “The Human Auditory System in Motion: Direct Observation of the Microfunction of Sound Transmission using Dynamic Phase-contrast X-ray Imaging”.