Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2007-10-09
2009-08-11
Arana, Louis M (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S307000
Reexamination Certificate
active
07573269
ABSTRACT:
A method for generating a magnetic resonance image of a moving subject comprises tracking the position and orientation of a target volume and modifying acquisition parameters for each line of k-space data using current position and orientation information. By approximating the target volume as a rigid object, the current position and orientation is translated into an offset vector and a rotation which are used to modify the acquisition of each k-space line individually. The offset along a slice direction is compensated for by changing the transmit frequency. The offset along the frequency-encoding direction is compensated for by changing the frequency of a reference demodulation signal. The offset along the phase direction is compensated for by changing the phase of a reference demodulation signal, or by adding a phase into the line of k-space data after acquisition. The rotation is applied directly to the logical axes to change the angles between the logical axes and the physical axes of a magnetic resonance imaging system.
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M. Zaitsev, C. Dold, J. Hennig, O. Speck, Title: Real Time Prospective Motion Correction for High Resolution in Vivo MRI Using an Optical Motion Tracking System, ISMRM 14, 2006, p. 2978.
Arana Louis M
Fitzpatrick William
GE Global Patent Operation
GE Medical Systems Global Technology Company LLC.
Phillips Roger C.
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