Large field-of-view tiled grating structures for X-ray phase-contrast imaging.
X-ray grating-based interferometry promises unique new diagnostic possibilities in medical imaging and materials analysis. To transfer this method from scientific laboratories or small-animal applications to clinical radiography applications, compact setups with a large field of view (FoV) are required. Currently the FoV is limited by the grating area, which is restricted due to the complex manufacturing process. One possibility to increase the FoV is tiling individual grating tiles to create one large area grating mounted on a carrier substrate. We investigate theoretically the accuracy needed for a tiling process in all degrees of freedom by applying a simulation approach. We show how the resulting precision requirements can be met using a custom-built frame for exact positioning. Precise alignment is achieved by comparing the fringe patterns of two neighboring grating tiles in a grating interferometer. With this method, the FoV can be extended to practically any desired length in one dimension. First results of a phase-contrast scanning setup with a full FoV of 384 mm × 24 mm show the suitability of this method.
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Tobias J
TJ
Schröter
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Frieder J
0000000341514844
FJ
Koch
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Pascal
P
Meyer
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Danays
D
Kunka
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Jan
J
Meiser
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Konstantin
K
Willer
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Lukas
L
Gromann
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Fabio
0000000235617305
F
De Marco
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Julia
J
Herzen
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Peter
P
Noel
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Andre
A
Yaroshenko
Institute for Applied Computer Science, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Andreas
A
Hofmann
Chair of Biomedical Physics, Department of Physics and Institute of Medical Engineering, Technical University of Munich, 85748 Garching, Germany.
Franz
F
Pfeiffer
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Jürgen
J
Mohr