Method of motion tracking measurement in MR imaging system

Details Method of motion tracking measurement in MR imaging system Method of motion tracking measurement in MR imaging system

1994-06-07

1996-08-13

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300, G01V 314

Patent

active

055459935

ABSTRACT:
Physical quantities representing six kinds of freedom relating to parallel movement and rotation of an inspection object are detected during repetition of a measurement sequence of magnetic resonance imaging, and a direction and a position of a desired slice moved with parallel movement and rotation of the inspection object are calculated in accordance with the detection result. An intensity ratio of gradient magnetic fields in x-, y- and z-axes directions for synthesizing a slice direction gradient magnetic field, an intensity of a phase encoder gradient magnetic field and a read direction gradient magnetic field are determined so that a direction of an excitation slice coincides with the direction of the desired slice after movement. Similarly, a center frequency of excitation pulses is determined so that a position of the excitation slice coincides with the position of the desired slice after movement. Magnetic resonance signals are measured by imaging parameters so updated, and an image is reconstructed.

REFERENCES:
patent: 4994743 (1991-02-01), Glover et al.
patent: 5042485 (1991-08-01), Sano et al.
patent: 5368030 (1994-11-01), Zinreich et al.
IEEE Trans, Medical Imaging, vol. 10, No. 4, pp. 548-553.
SMRM 9th Annual Meeting (1990) p. 560.
SMRM 10th Annual Meeting (1991) p. 1227.

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