Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2007-02-20
2007-02-20
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S309000
Reexamination Certificate
active
11269035
ABSTRACT:
For the purpose of providing an MRI apparatus which gives rise to no phase deviation due to frequency alteration of the RF magnetic field and signals for detection use, the MRI apparatus includes: signal collecting means which detects and collects magnetic resonance signals generated by applying a magnetostatic field, a gradient magnetic field and an RF magnetic field onto an object; frequency altering means which alters the frequency of the RF magnetic field and the frequency of signals for detection use in accordance with change in the Larmor frequency with time; and image reconstructing means which reconstructs an image on the basis of the collected signals, and further comprises: phase control means which sets as the phase at the time of starting detection of signals for detection use a phase Δθ given by a relational expression Δθ=2π·Δf·T using the difference Δf between the frequency altered by the frequency altering means and a reference frequency, and a time period T from the start of applying the RF magnetic field to the start of detection of magnetic resonance signals.
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Armstrong Teasdale LLP
GE Medical Systems Global Technology Company LLC
Horton Esq. Carl B.
Shrivastav Brij B.
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