Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1986-09-10
1988-01-19
Noland, Tom
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324312, 324314, 364150, 382 50, G01R 3320
Patent
active
047206780
ABSTRACT:
In a system for reducing artifacts in a desired image due to substantially periodic variations in the imaging signal detected from a portion of an object under examination, a method and apparatus for generating from a signal y(t) related to the variations and whose values are not equally likely, a signal .phi.(t) whose values are substantially equally likely for use in distributing events substantially evenly over the variations. In order to provide the signal .phi.(t), an apparatus is disclosed for executing the following steps: (a) establishing a historical data base derived from values of the signal y(t) for a period of time preceding the present time, (b) measuring parameters related to the present value of the signal y(t); and (c) producing a value for .phi.(t) using the present measured parameters and the historical data base; wherein the values of .phi.(t) are more evenly distributed than the values of y(t).
REFERENCES:
patent: 4663591 (1987-05-01), Pelc et al.
C. L. Schultz et al., "The Effect of Motion on Two-Dimensional Fourier Transformation Magnetic Resonance Images." Radiology, Jul. 1984, pp. 117-121; vol. 152, No. 1.
D. R. Bailes, et al., "Respiratory Ordered Phase Encoding (ROPE): A Method for Reducing Respiratory Motion Artefacts in MR Imaging." Journal of Computer Assisted Tomography, vol. 9, No. 4, pp. 835-838, Jul./Aug. 1985.
B. Vinocur, "Motion-Reduction Software Brightens Outlook for Body MRI", Diagnostic Imaging, pp. 79, 82 and 84, Aug., 1985.
"Digital Radiography", William P. Brody, M.D., Ph.D., Raven Press, 1984, pp. 61-62.
Glover Gary H.
Pelc Norbert J.
General Electric Company
Noland Tom
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