The next Imaging and Optical Physics Seminar which will be held on-line via Zoom (see connection details below) from 2 pm on Tuesday, 6 October, 2020 (note the slightly different time compared to the previous seminars). The presenters will be Dr Andrew Stevenson (Australian Synchrotron, ANSTO / CSIRO) and Dr Marie-Christine Zdora (University of Southampton / Diamond Synchrotron). You can find the information about the talks below.
Here are the connection details that everyone will need to use for this webinar:
Join from a PC, Mac, iPad, iPhone or Android device:
Please click this URL to start or join. https://monash.zoom.us/j/94356286055?pwd=WjRuMEFHbVZJeE95ME1SaEd1Y2JUZz09 Or, go to https://monash.zoom.us/join and enter meeting ID: 943 5628 6055 and password: 50302443
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Webinar Agenda:
2.00-2.30pm
Dr Andrew Stevenson (Australian Synchrotron - ANSTO / CSIRO)
Title: Micro-Computed Tomography (MCT): A BRIGHT new beamline at ANSTO/Australian Synchrotron
Abstract: Micro-Computed Tomography (MCT) has been announced as one of the first new beamlines to be constructed at the Australian Synchrotron as part of the BRIGHT program. MCT will complement the existing X-ray imaging/tomography capability provided by the Imaging and Medical Beamline (IMBL), and will target applications requiring higher (sub-micron) spatial resolution and involving smaller samples. MCT will be a bending-magnet beamline, operating in the 8 to 40 keV range, based on a double-multilayer monochromator. This monochromator will be able to be removed from the X-ray beam path, enabling studies with a filtered white beam when required. The photon-delivery system will also house a single-(vertical)bounce mirror, capable of suppressing harmonic contamination in low-energy monochromatic beams and providing the means to shape the spectrum of filtered white beams on the high-energy side. MCT will benefit from X-ray phase-contrast modalities (such as propagation-based, grating-based and speckle) in addition to conventional absorption contrast, and be equipped with a robotic stage for rapid sample exchange. A higher-resolution CT configuration based on the use of a Fresnel zone plate system will also be available. A number of sample environmental stages, such as for high temperature and the application of loads, are planned in collaboration with certain groups in the user community.
Anticipated application areas for non-destructive 3D sample characterization include biomedical/ health science, food, materials science, and palaeontology. This presentation will detail the current design, planning and procurement effort being devoted to MCT.
2.30-3.00pm
Dr Marie-Christine Zdora (University of Southampton / Diamond Synchrotron)
Title: : X-ray speckle-based imaging: Principles and applications
Abstract: X-ray speckle-based imaging (SBI) is a recent multimodal technique capable of delivering attenuation, phase-contrast and dark-field signals of a sample. SBI is based on a very simple experimental setup that only requires an X-ray diffuser, such as a piece of sandpaper, as an additional optical element. Thanks to its simplicity, high phase sensitivity and quantitative character, SBI has received great interest in the X-ray imaging community.
In this talk, I will first explain the principles of SBI and give an overview of the various data acquisition and image reconstruction methods. I will then present our recent results on SBI phase tomography for 3D virtual histology, demonstrating the great potential of the technique in the biomedical field. I will finish with a short outline of the possibilities and first results of SBI implemented at laboratory X-ray sources, which is an important step towards the wider availability and use of the technique.
