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  4. Non-Equispaced System Matrix Acquisition for Magnetic Particle Imaging Based on Lissajous Node Points
 
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Non-Equispaced System Matrix Acquisition for Magnetic Particle Imaging Based on Lissajous Node Points

Publikationstyp
Journal Article
Date Issued
2016-11-01
Sprache
English
Author(s)
Kaethner, Christian  
Erb, Wolfgang  
Ahlborg, Mandy  
Szwargulski, Patryk  
Knopp, Tobias  
Buzug, Thorsten M.  
Institut
Biomedizinische Bildgebung E-5  
TORE-URI
http://hdl.handle.net/11420/5568
Journal
IEEE transactions on medical imaging  
Volume
35
Issue
11
Start Page
2476
End Page
2485
Article Number
7490369
Citation
IEEE Transactions on Medical Imaging 11 (35): 7490369 2476-2485 (2016-11-01)
Publisher DOI
10.1109/TMI.2016.2580458
Magnetic Particle Imaging (MPI) is an emerging technology in the field of (pre)clinical imaging. The acquisition of a particle signal is realized along specific sampling trajectories covering a defined field of view (FOV). In a system matrix (SM) based reconstruction procedure, the commonly used acquisition path in MPI is a Lissajous trajectory. Such a trajectory features an inhomogeneous coverage of the FOV, i.e. the center region is sampled less dense than the regions towards the edges of the FOV. Conventionally, the respective SM acquisition and the subsequent reconstruction do not reflect this inhomogeneous coverage. Instead, they are performed on an equispaced grid. The objective of this work is to introduce a sampling grid that inherently features the aforementioned inhomogeneity by using node points of Lissajous trajectories. Paired with a tailored polynomial interpolation of the reconstructed MPI signal, the entire image can be recovered. It is the first time that such a trajectory related non-equispaced grid is used for image reconstruction on simulated and measured MPI data and it is shown that the number of sampling positions can be reduced, while the spatial resolution remains constant.
Subjects
Acquisition Grid
Interpolation
Lissajous Node Points
Magnetic Particle Imaging
Reconstruction
DDC Class
600: Technik
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