Imaging systems

Patent 4254778 Issued on March 10, 1981. Estimated Expiration Date:

May 22, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3789832

Inventors

Assignee

EMI Limited

Application

No. 06/041424 filed on 05/22/1979

US Classes:

600/410, Magnetic resonance imaging or spectroscopy324/309, To obtain localized resonance within a sample324/314With conditioning of transmitter signal

Examiners

Primary: Michell, Robert W.
Assistant: Jaworski, Francis J.

Attorney, Agent or Firm

Fleit & Jacobson

International Classes

A61B 5/055 (20060101)
G01R 33/54 (20060101)
G01R 33/48 (20060101)

Foreign Application Priority Data

1978-05-25 GB

Abstract

In an apparatus for examining human bodies by nuclear magnetic resonance to produce images of cross-sectional slices of such bodies, it is desirable to reduce the recovery time between scans at different angles. A suitable pulse sequence for examination with minimum dispersion is disclosed. Repetition of the sequence with inverted pulses to drive the spins back to equilibrium and reduce recovery time is also disclosed.

Other References

Mansfield, P. "Proton Spin Imaging by Nuclear Magnetic Resonance", Contemp. Physics, 1976, vol. 17, No. 6, pp. 553-576
Becker, E. D. et al., "Driven Equilibrium Fourier Transform Spectroscopy, A New Method for Nuclear Magnetic Resonance Signal Enhancement", Jrnl. of Amer. Chem. Soc., 91:27, Dec. 31, 1969 pp. 7784, 7785
Easson, R. M., "Design & Performance of Yig-Tuned Gunn Oscillators," Microwave Journal, Feb. 1971, pp. 53-54, 56, 58, 68
Hoult, D. I., "Zeugmatography; A Criticism of the Concept of a Selective Pulse in the Presence of a Field Gradient," Jrnl. of Mag. Res. 26, 165-167 (1977)