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Mobile Magnetic Particle Imaging Disclosure Number: IPCOM000186516D
Publication Date: 2009-Aug-25
Document File: 1 page(s) / 115K

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The Prior Art Database



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Mobile Magnetic Particle Imaging

     MPI detects very weak responses from magnetic nano-particles. A special shielding room is used to stop signals from outside to interfere. The shielding (weight, size) does not allow to move the MPI equipment around the hospital. It would be beneficial to have an MPI system that can be moved around the hospital. One application could be an instrument that can be rolled to the bed of the patient, rather than moving the patient to a special scanner room. A possible product could be a movable low- performance low-cost MPI scanners, e.g. for supervision of internal bleeding such as cerebral hemorrhage. It should ideally only require a 230V~ socket to be operational.

     The present document presents filtering concepts that allow to avoid a shielding, thereby enabling an MPI devices that can be moved around in the hospital, e.g. directly to the patient bed.

Several aspects have to be solved in order to realize a mobile device:

a) Static and Time-varying Magnetic fields outside some distance to the device shall be below regulations to protect humans (0.5mT for pace makers)
b) Interference to hospital equipment

a) High-frequency field (VHF, UHF) can be stopped by appropriate low-pass filters
b) Low-frequency fields (e.g. AM-emitters in long and medium wave) need other mechanisms. The receive coil can be optimised such, that its far field vanishes very rapidly with distance. One very simple realisation would be to place a second receive coil electrically in series, apart from the FOV, to receive only the field from external disturbers, but with opposite direc...