Artifact free reconstruction with the system matrix approach by overscanning the field-free-point trajectory in magnetic particle imaging
| Autor: | Tobias Knopp, Alexander E. Weber, Thorsten M. Buzug, Jürgen Weizenecker, Franziska Werner |
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| Rok vydání: | 2015 |
| Předmět: |
Diagnostic Imaging
Field (physics) Signal 030218 nuclear medicine & medical imaging 03 medical and health sciences Magnetization 0302 clinical medicine Magnetic particle imaging Region of interest Astrophysics::Solar and Stellar Astrophysics Humans Radiology Nuclear Medicine and imaging Computer vision Physics Artifact (error) Radiological and Ultrasound Technology business.industry Phantoms Imaging Ferrosoferric Oxide Magnetic Fields 030220 oncology & carcinogenesis Trajectory Artificial intelligence business Artifacts Rotation (mathematics) |
| Zdroj: | Physics in medicine and biology. 61(2) |
| ISSN: | 1361-6560 |
| Popis: | Magnetic particle imaging is a tracer-based imaging method that utilizes the non-linear magnetization response of iron-oxide for determining their spatial distribution. The method is based on a sampling scheme where a sensitive spot is moved along a trajectory that captured a predefined field-of-view (FOV). However, particles outside the FOV also contribute to the measurement signal due to their rotation and the non-sharpness of the sensitive spot. In the present work we investigate artifacts that are induced by particles not covered by the FOV and show that the artifacts can be mitigated by using a system matrix that covers not only the region of interest but also a certain area around the FOV. The findings are especially relevant when using a multi-patch acquisition scheme where the boundaries of neighboring patches have to be handled. |
| Databáze: | OpenAIRE |
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