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Local Magnetic Particle Imaging with Revolving Permanent Magnets Disclosure Number: IPCOM000213515D
Publication Date: 2011-Dec-20
Document File: 1 page(s) / 52K

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Local Magnetic Particle Imaging with Revolving Permanent Magnets

Magnetic Particle Imaging (MPI) is a proposed new method for imaging the local distribution of magnetic tracer materials, which can be used in medical imaging. It was first described in "B. Gleich, J. Weizenecker, Tomographic imaging using the nonlinear response of magnetic particles, Nature 435, 2005" and in many subsequent publications and patents; see "J. Borgert, B. Gleich, T.M. Buzug, Magnetic Particle Imaging, in Kramme, RĂ¼diger; Hoffmann, Klaus-Peter; Pozos, Robert Steven (Eds.), Springer Handbook of Medical Technology, Springer-Verlag, Heidelberg, 2011" for a good overview of the existing literature as of end of 2010.

    MPI uses static gradient fields (selection field) and time varying external magnetic fields (drive fields) to perform spatial encoding and to change the magnetization of magnetic tracer materials. Usually, all these fields are applied from outside the field-of-view, which results in considerable efforts spent on field generation. Furthermore, the local spatial resolution is determined by the outside fields, which can be limiting if the area-of-interest is very small, e.g. a vessel wall, in relation to the dimensions of the object under examination.

    A current-free, local, revolving permanent magnet is disclosed based on Magnetic Particle Imaging (MPI) for very small fields of view. The selection field is generated by nested, concentric permanent magnets. The magnet...