公开(公告)号：EP0145277B1

公开(公告)日：1988-03-02

申请号：EP84307728.0

申请日：1984-11-08

Applicant: TECHNICARE CORPORATION

Inventor： Kramer, David Moses ,  Yeung, Hong Ning

IPC: G01R33/20

CPC classification number: G01R33/565

公开(公告)号：EP0213858A3

公开(公告)日：1988-03-02

申请号：EP86306319

申请日：1986-08-15

Applicant: TECHNICARE CORPORATION

Inventor： Kramer, David Moses ,  Compton, Russell Allen ,  Yeung, Hong-Ning

IPC: G01N24/08

CPC classification number: G01R33/4835 ,  G01R33/4828

Abstract: In a magnetic resonance imaging system, a multiplexing technique is used to image volumetric regions by performing a number of scans within the recovery time of the spin systems. The multiple scans acquire signal information from sub-regional volumes by phase-encoding in the direction of the excitation gradient.

公开(公告)号：EP0134701B1

公开(公告)日：1989-11-08

申请号：EP84305284.6

申请日：1984-08-03

Applicant: TECHNICARE CORPORATION

Inventor： Compton, Russell Allen ,  Kramer, David Moses ,  Hinshaw, Waldo Stephen

IPC: G01N24/06 ,  G01N24/08

CPC classification number: G01R33/385 ,  G01R33/381

公开(公告)号：EP0134701A3

公开(公告)日：1986-02-05

申请号：EP84305284

申请日：1984-08-03

Applicant: TECHNICARE CORPORATION

Inventor： Compton, Russell Allen ,  Kramer, David Moses ,  Hinshaw, Waldo Stephen

IPC: G01N24/06 ,  G01N24/08

CPC classification number: G01R33/385 ,  G01R33/381

Abstract: The null point in the gradient field of an NMR imaging system is offset from its nominal position in the static magnetic field by application of a bias field to the gradient field. The bias field produces a substantially uniform offset in the field intensity at every point in the gradient field. Alternatively, null point offset may be achieved by controll- ably superimposing two gradient fields of separately located null points.

公开(公告)号：EP0145277A1

公开(公告)日：1985-06-19

申请号：EP84307728.0

申请日：1984-11-08

Applicant: TECHNICARE CORPORATION

Inventor： Kramer, David Moses ,  Yeung, Hong Ning

IPC: G01R33/20

CPC classification number: G01R33/565

Abstract: In an NMR imaging system, two-pulse excitation sequences are used to acquire lines of NMR signal information. Artifact signal components may also be present during the times of NMR signal acquisition. In order to remove these artifacts from the center of the image, the artifact signals are alternately phase-encoded from line to line by alternating the phase of one of said excitation pulses from line to line. Fourier transformation is performed on the lines of information in at least the direction of alternate phasing of the artifact components, which relocates the artifacts to the edge of the resulting image.

公开(公告)号：EP0204569A3

公开(公告)日：1988-03-09

申请号：EP86304287

申请日：1986-06-05

Applicant: TECHNICARE CORPORATION

Inventor： Kramer, David Moses ,  Strenk, Lawrence Matthew ,  Compton, Russell Allen ,  Murdoch, James Bryce

IPC: G01N24/08

CPC classification number: G01R33/482 ,  G01R33/56554

Abstract: The present invention provides nuclear magnetic resonance apparatus for producing resonance information in the form of first and second spin echo signals, comprising:
means for applying a static magnetic field to a subject being examined; means for applying a first radio frequency signal to said subject for inducing nuclear magnetic resonance information signals; means for applying a second radio frequency signal to said subject for generating spine cho signals at the end of a first predetermined time interval following said first radio frequency signal; and means for applying a third radio frequency signal to said subject for generating spine cho signals at the end of a second predetermined time interval following said first radio frequency signal, which second predetermined time interval is not harmonically related in duration to the duration of said first predetermined time interval.

公开(公告)号：EP0219206A3

公开(公告)日：1987-09-16

申请号：EP86306320

申请日：1986-08-15

Applicant: TECHNICARE CORPORATION

Inventor： Compton, Russell Allen ,  Keller, John Timothy ,  McBride, Thomas Robert ,  Kramer, David Moses

IPC: A61B05/05 ,  G01N24/00

CPC classification number: G01R33/583

Abstract: In a magnetic resonance imaging system, the same reference signal is used for both radio frequency transmission and phase sensitive detection. The use of the same reference signal for both transmission and reception prevents phase unlock between the two events. However, this technique results in variation in the demodulated, frequency encoded information, which is corrected by digitally filtering the received signal information as a function of the demodulation frequency used.

公开(公告)号：EP0134701A2

公开(公告)日：1985-03-20

申请号：EP84305284.6

申请日：1984-08-03

Applicant: TECHNICARE CORPORATION

Inventor： Compton, Russell Allen ,  Kramer, David Moses ,  Hinshaw, Waldo Stephen

IPC: G01N24/06 ,  G01N24/08

CPC classification number: G01R33/385 ,  G01R33/381

Abstract: The null point in the gradient field of an NMR imaging system is offset from its nominal position in the static magnetic field by application of a bias field to the gradient field. The bias field produces a substantially uniform offset in the field intensity at every point in the gradient field. Alternatively, null point offset may be achieved by controll- ably superimposing two gradient fields of separately located null points.