Boundary artifact reduction by extrapolating system matrices outside the field-of-view in joint multi-patch MPI

In multi-patch magnetic particle imaging an artifact-free image can be obtained by using a joint reconstruction and measuring the system matrices not only in the field-of-view but also in a huge overscan. This leads to a long calibration time and heavy memory consumption and therefore an unsuitability of this method for large three-dimensional measurements. In this work, we propose to only measure the system matrices in the field-of-view and to use a diffusion based extrapolation step to extend the system matrices computationally into the overscan. In this way, we massively reduce the calibration time while maintaining a nearly artifact-free image.

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004: Informatik

610: Medizin

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Research funding: The authors thankfully acknowledge the financial support by the German Research Foundation (DFG, grant number KN 1108/7-1).

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Boundary artifact reduction by extrapolating system matrices outside the field-of-view in joint multi-patch MPI