Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-50461 Posterpräsentation Kulow, Anicó Full field X-ray fluorescence imaging with coded apertures Our aim is to develop a simple and inexpensive method for full field X-ray fluorescence imaging.We combine an energy-dispersive array detector with a coded aperture to obtain high resolution images. To obtain the information from the recorded image a reconstruction step is necessary. The reconstruction methods we have developed, were tested on simulated data and then applied to experimental data. The first tests were carried out at the BAMline @ BESSY II. This method enables the simultaneous detection of multiple elements, which is important e.g. in the field of catalysis. 2020 CONEXS 2020 Newcastle, UK 18.02.2020 20.02.2020 2020-02-26 OPUS4-49963 Posterpräsentation Kulow, Anicó X-ray fluorescence imaging with coded apertures We developed a new method for full field X-ray fluorescence imaging at the BAMline @ BESSY II. We combined an energy dispersive array detector for X-rays with a coded aperture to get high resolution images. In coded aperture imaging, an object is projected through a mask, producing many overlapping images on the detector. To get the information about the investigated object out of the projected image, a decoding step is necessary. The first part of our project was to develop the decoding algorithms. We tested the reported reconstruction with an antimask and compared the results with the performance of self-written reconstruction programs based on an iterative and a genetic algorithm. First tests were performed with raytracing simulations. The next step was the collection of experimental data at the BAMline @ BESSY II (HZB). A test objects could be successfully reconstructed with our newly developed algorithm. 2019 PRORA 2019 Berlin, Germany 28.11.2019 29.11.2019 2019-12-11 OPUS4-47997 Vortrag Kulow, Anicó X-ray imaging with coded apertures Coded aperture imaging systems are in use in astrophysics since the 1960's. We want to adapt this technique for full field x-ray fluorescence imaging in combination with a color-x-ray-camera. 2019 Seminar des Atominstituts der TU Wien Vienna, Austria 14.05.2019 14.05.2019 2019-05-20 OPUS4-51518 Zeitschriftenartikel Kulow, Anicó; de Oliveira Guilherme Buzanich, Ana; Reinholz, Uwe; Emmerling, Franziska; Hampel, S.; Fittschen, U.E.A.; Streli, C.; Radtke, Martin Comparison of three reconstruction methods based on deconvolution, iterative algorithm and neural network for X-ray fluorescence imaging with coded apertures X-ray imaging methods are used in many fields of research, as they allow a non-destructive Investigation of the elemental content of various samples. As for every imaging method, for X-ray imaging the optics are of crucial importance. However, these optics can be very expensive and laborious to build, as the requirements on surface roughness and precision are extremely high. Angles of reflection and refraction are often in the range of a few mrad, making a compact design hard to achieve. In this work we present a possibility to simplify X-ray imaging. We have adapted the coded aperture method, a high energy radiation imaging method that has its origins in astrophysics, to full field X-ray fluorescence imaging. In coded aperture imaging, an object is projected through a known mask, the coded aperture, onto an area sensitive detector. The resulting image consists of overlapping projections of the object and a reconstruction step is necessary to obtain the information from the recorded image. We recorded fluorescence images of different samples with an energy-dispersive 2D detector (pnCCD) and investigated different reconstruction methods. With a small coded aperture with 12 holes we could significantly increase the count rate compared to measurements with a straight polycapillary optic. We show that the reconstruction of two different samples is possible with a deconvolution approach, an iterative algorithm and a neural network. These results demonstrate that X-ray fluorescence imaging with coded apertures has the potential to deliver good results without scanning and with an improved count rate, so that measurement times can be shortened compared to established methods. United Kingdom Royal Society of Chemistry 2020 Journal of Analytical Atomic Spectrometry 35 7 1423 1434 10.1039/d0ja00146e 2020-11-05