Correction of local field inhomogeneity in magnetic resonance imaging apparatus


Perturbations in a static magnetic field of magnetic resonance imaging apparatus are compensated by creating magnetic fields near an object creating the perturbations with the magnetic fields adjusted to offset the perturbations in the static magnetic field. In an embodiment where the perturbations are caused by an x-ray detector in a combined modality imaging apparatus, the coils are positioned to surround the x-ray detector and create magnetic fields in the static magnetic field outside of the detector which compensate for the perturbations caused by the x-ray detector.


< Urological electrosurgical resectoscope

< Real time self-adjusting calibration algorithm

> Apparatus for the characterization of tissue of epithelial lined viscus

> Method and device for determining access to a subsurface target

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