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US 8,948,841 B2Granted
MR-tracking based on magnetic signature selective excitation
AssigneesPolyvalor, Limited Partnership, Val-Chum, Limited Partnership
InventorsSylvain Martel, Jean-Baptiste Mathieu, Ouajdi Felfoul, Gilles Beaudoin
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Abstract
The present invention relates to a MR tracking method and device. More specifically, the present invention relates to a magnetic resonance tracking method and device, using a magnetic-susceptible object. A magnetic iso-surface induced by the object is selectively excited with a corresponding frequency offset; the magnetic iso-surface is then projected on three axes of a k-space, from which projections the spatial position of the object is calculated.
Claims11
A method for magnetic resonance tracking comprising:
- providing a magnetic-susceptible object in an MRI system, wherein said object is magnetically saturated and forms a magnetic dipole;
- selecting a predetermined frequency offset corresponding to a desired magnetic iso-surface about the object;
- generating the predetermined frequency in the MRI system to selectively excite an induced magnetic iso-surface about the object having a shape corresponding to the magnetic dipole and a size larger than the object;
- applying a readout gradient in the MRI system and projecting the excited induced magnetic iso-surface on three axes G1, G2 and G3 in k-space to obtain three projection lines representing the position of the excited induced magnetic iso-surface on the three axes;
- and
- calculating the position of the object from the three projections.
3 more elements
Dependencies are inferred from the claim text.