초록 ▼

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 grad

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.

대표청구항 ▼

[ What claimed is:] [1.] A method for determining a position of a surgical instrument, the method comprising the steps of:placing an electron spin resonance sample in a known position with respect to the surgical instrument;placing the sample in the imaging region of a magnetic resonance imaging app

[ What claimed is:] [1.] A method for determining a position of a surgical instrument, the method comprising the steps of:placing an electron spin resonance sample in a known position with respect to the surgical instrument;placing the sample in the imaging region of a magnetic resonance imaging apparatus having a main magnetic field;applying at least a first gradient magnetic field in the imaging region;determining the resonant frequency of the sample in the presence of the at least a first gradient magnetic field; andbased on the resonant frequency of the sample, determining the position of the surgical instrument with respect to the at least a first gradient magnetic field.