Nuclear magnetic resonance imaging with patient protection again

Details Nuclear magnetic resonance imaging with patient protection again Nuclear magnetic resonance imaging with patient protection again

1994-03-14

1996-03-12

Smith, Ruth S.

Surgery

Truss

Pad

324318, 324322, A61B 5055

Patent

active

054977738

ABSTRACT:
A nuclear magnetic resonance imaging scheme capable of reducing the eddy currents induced within the living body outside of the imaging region, so as to protect the patient against the nerve stimulation due to the eddy currents, and obtaining the MR images at high image quality by protecting the image quality against the N/2 and chemical artifacts. The nerve stimulation is prevented by providing a shield member for shielding a nerve stimulation sensitive portion of the patient located outside of the imaging region from a change of the gradient magnetic fields. The artifacts are prevented by applying a reading gradient magnetic field which is repeatedly switching its polarity along a phase encoding gradient magnetic field applied at a rate of once in every two switchings of the reading gradient magnetic field, separating the acquired NMR signals resulting from odd and even turns of switchings of the reading gradient magnetic field as separate data sets, and re-constructing MR images from the separate data set for odd turns and even turns separately.

REFERENCES:
patent: 5028872 (1991-07-01), Nakabayashi
patent: 5348012 (1994-09-01), Kojima
Cohen et al., Sensory stimulation by time-varying magnetic fields, Magnetic Resonance in Medicine, (1990) vol. 14, pp. 409-414.
Budinger et al., Health effects of in vivo nuclear magnetic resonance, Biomedical Magnetic Resonance, pp. 421-441.
McRobbie et al., Thresholds for biological effects of time-varying magnetic fields, Clin. Phys. Physiol. Meas., (1984), vol. 5, pp. 67-78.
Yamagata et al., Evaluation of dB/dt thresholds for nerve stimulation elicited by trapezoidal and sinusoidal gradient fields in echo-planar imaging, Proceedings of 10th Annual Meeting of Magnetic Resonance in Medicine, p. 1277.

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