Local coil unit for a magnetic resonance apparatus

Details Local coil unit for a magnetic resonance apparatus Local coil unit for a magnetic resonance apparatus

2006-02-21

2006-02-21

Arana, Louis M. (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C600S421000

Reexamination Certificate

active

07002347

ABSTRACT:
A local coil unit for a magnetic resonance apparatus, which radiates a radio-frequency field into an examination subject, has a housing and at least a part of the housing is formed of an insulating dielectric material that passively compensates for an inhomogeneity in the high-frequency field in the subject. The material has a relative dielectric value εrof greater than 50, preferably greater than 100, and a dielectric loss factor tan δ of less than 2.5×10−2, preferably less than 1×10−3. In the dielectric material displacement currents are generated which create an additional magnetic field that compensates for the minima in the B1 field as a result of the eddy currents arising in the patient due to the radio-frequency radiation.

REFERENCES:
patent: 5017872 (1991-05-01), Foo et al.
patent: 5410251 (1995-04-01), Renz
patent: 5865177 (1999-02-01), Segawa
patent: 5913888 (1999-06-01), Steinmeyer et al.
patent: 6252403 (2001-06-01), Alsop
Disclosure RD442005 - Publication Date Feb. 10, 2001.
“Manipulation of Signal Intensity Distribution with Dielectric Loading at 7.0T,” Yang et al, Proc. Intl. Soc. Mag. Reson. Med., vol. 9 (2001) p. 1096.

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