A concept for a magnetic particle imaging scanner with Halbach arrays

Physics in Medicine and Biology
Anna C BakeneckerThorsten M Buzug

Abstract

Magnetic particle imaging (MPI) is a new medical imaging technique visualizing the concentration distribution of superparamagnetic nanoparticles used as tracer material. MPI is not yet in clinical routine, since one of the challenges is the upscaling of scanners. Typically, the magnetic fields of MPI scanners are generated electromagnetically, resulting into an immense power consumption, but providing high flexibility in terms of adjusting the field strengths and very fast image acquisition rates. Permanent magnets provide high flux densities and do not need any power supply. However, the flux density is not adjustable and a mechanical movement is slow compared to electromagnetically varying fields. The here proposed MPI scanner concept uses permanent magnets, and provides high flexibility with the possibility to choose between fast overview scanning and detailed image acquisition. By mechanical rotation of magnetic rings in Halbach array configuration it is possible to adjust the field strength or gradient strengths, respectively. The latter allows for determining the spatial resolution and the size of the field of view. A continuous mechanical rotation defines the coarseness of the scanning trajectory and the image acquisitio...Continue Reading

References

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Citations

Jan 12, 2021·Journal of Magnetic Resonance·Arne WickenbrockPeter Blümler

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