Regensburg 2019 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 1: X-ray Imaging

ST 1.4: Vortrag

Montag, 1. April 2019, 15:45–16:00, H48

Improved Grating Interferometer for Dynamical Imaging at the Munich Compact Light Source — •Johannes Brantl, Martin Dierolf, Christoph Jud, Klaus Achterhold, and Franz Pfeiffer — Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching, Germany

X-ray grating interferometry allows the measurement of three complementary image modalities, attenuation, phase contrast and dark field. In the default acquisition scheme, phase and absorption grating have to be translated relative to each other resulting in a stepping curve. This can limit the visualisation of dynamical systems even if the flux is sufficiently high to allow for short exposure times. This is the case at the Munich Compact Light Source (MuCLS) [1], where a synchrotron-like X-ray beam is produced by inverse Compton scattering. Despite the high flux, dynamical imaging could so far only been performed for periodic processes, e.g. for in-vivo phase-contrast imaging of the respiratory system of mice [2], due to the limited stepping speed. The extension to temporal measurements of non-periodic dynamical systems is achieved by upgrading the current setup with a piezo actuator for stepping. We will present first results of imaging dynamical processes on the subsecond scale.

[1] Eggl, Elena et al., ``The Munich Compact Light Source: initial performance measures'', J. of Synch. Rad. 23 (2016): 1137-1142.

[2] Gradl, R., et al. ``Dynamic in vivo chest x-ray dark-field imaging in mice'', IEEE Trans. Med. Imag. (2018).