MR method and MR device for determining the position of microcoi

Details MR method and MR device for determining the position of microcoi MR method and MR device for determining the position of microcoi

1998-02-17

2000-07-11

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

600424, G01V 300

Patent

active

060878312

ABSTRACT:
The invention relates to an MR method and an MR device for determining the position of at least one microcoil (11, 12) which is provided in or on an object (1) to be examined which is situated in an examination zone. During the acquisition of microcoil MR signals (S), at least one variable magnetic gradient field acts on the examination zone, so that the k space is scanned at scanning points (k.sub.x (t.sub.i), k.sub.y (t.sub.i)). The position (x, y) of the microcoil (11, 12) is determined from at least three scanning values (S(t.sub.i)) of a microcoil MR signal and the associated scanning points (k.sub.x (T.sub.i), k.sub.y (t.sub.i)) for example by solving a system of equations formed from these values. The MR method can be used for various scanning modes of the k space, and the acquisition of the microcoil MR signals (S) does not require any MR sequences other than the MR sequences required for determining the nuclear magnetization distribution in the examination zone.

REFERENCES:
patent: 5353795 (1994-10-01), Souza et al.
patent: 5644234 (1997-07-01), Rasche et al.
patent: 5936406 (1999-08-01), Potthast
"Real Time Positioning Monitoring of Invasive Devices Using Magnetic Resonance" C.L. Domoulin et al, Magnetic Resonance in Medicine, Mar. 1993, pp. 411-415.

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