Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1997-10-27
1999-03-16
Smith, Ruth S.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600420, 600424, 324316, 324318, 324322, A61B 5055
Patent
active
058823042
ABSTRACT:
A magnetic probe (1) for use with a magnetic resonance imaging apparatus comprises an electron spin resonance (ESR) magnetometer. The position of the probe (1) tracked by measuring the resonant frequency of an ESR sample (32) in the probe. The resonant frequency is measured in the presence of a gradient sequence which employs three orthogonal, linear gradients. By determining the resonant frequency of the ESR sample in the presence of each of the gradients, the position of the probe can be determined. The probe may be placed on or in an object, and the position of the probe may be displayed on a desired magnetic resonance image of the object.
REFERENCES:
patent: 4572198 (1986-02-01), Codrington
patent: 5218964 (1993-06-01), Sepponen
patent: 5488950 (1996-02-01), Ehnholm
E. Dormann, et al.; "Application of The Organic Conductor (Fluoranthene)2+PF 6 As An ESR Magnetic Field Probe"; Journal of Magnetism and Magnetic Materials 54-57 (1986) 1315-1316.
D. Duret, et al.; "A New Ultra Low-Field ESR Spectrometer"; Rev. Sci. Instrum., vol. 62, No. 3, Mar. 1991, pp. 685-694.
Ehnholm Gosta J.
Vahala Erkki T.
Clair Eugene E.
Fry John J.
Gurin Timothy B.
Picker Nordstar Corporation
Smith Ruth S.
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