Magnetic resonance imaging apparatus including an interference-p

Details Magnetic resonance imaging apparatus including an interference-p Magnetic resonance imaging apparatus including an interference-p

1988-11-02

1990-03-20

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

049104616

ABSTRACT:
A magnetic resonance imaging apparatus includes an r.f. coil which is comprised of a number (for example, two in the case of a surface coil and four in the case of a cylindrical coil) of coaxial cables. The outer jackets of the cables are arranged so as to form a sleeve enclosing the core or center portion at the area of a node in the electric field. By keeping lead-out portions of the cables outside the sleeve, a highly interference free coil is obtained. The total cable length amounts to, for example, 3/4.lambda., with 1/4.lambda. as a lead out portion and 0.1.lambda. as a sleeve core defining the coil circumference.

REFERENCES:
patent: 2349154 (1944-05-01), Finch
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patent: 4605899 (1986-08-01), Eumurian et al.
patent: 4616181 (1986-10-01), Kemner et al.
patent: 4700137 (1987-10-01), Yoda et al.
patent: 4712067 (1987-12-01), Roschmann et al.
Ramo, S. et al., "Fields and Waves in Communication Electronics", 2nd Ed., (1984), pp. 238-247.

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