JOHN LISTERUD
Medical Practice in Philadelphia, PA

6288543, Sep 11, 2001

Aug 30, 1996

8/706185

John Listerud - Philadelphia PA
Robert Grossman - Haverford PA

The Trustees of the University of Pennsylvania - Philadelphia PA

G01V 300

324309

A method for improved magnetic resonance imaging is disclosed herein. This method includes the step of interleaving a first slice-selective inversion recovery pulse within two slice-selective echo trains resulting from two other slice-selective inversion recovery pulses generated prior to the first pulse during a rapid spin echo sequence. In other words, the first slice-selective inversion recovery pulse is generated after receiving a first slice-selective echo train resulting from a second slice-selective inversion recovery pulse generated prior to the first pulse and before receiving a second slice-selective echo train resulting from a third slice-selective inversion recovery pulse generated prior to the generation of the first pulse.

5250899, Oct 5, 1993

Aug 12, 1991

7/744193

John Listerud - Philadelphia PA
Teresa Chan - Wauwatosa WI

Trustees of the University of Pennsylvania - Philadelphia PA

G01R 3320

324309

A method for suppressing fat in a magnetic resonance image of a target organ, wherein fat is present in the vicinity of the target organ involves subjecting the target organ to electromagnetic energy so as to cause an organ signal response and a fat signal response related to the magnetization of the organ and the fat, respectively. The subjecting to electromagnetic energy involves subjecting the target organ to a saturation preamble and thereafter subjecting the target organ to an offsetting spin-echo sequence. The organ and fat responses are detected and image information based on the responses is generated. The saturation preamble, selectively excites and then dephases a particular substance, such as fat, in the vicinity of the target organ. Preferably exciting and then dephasing involves subjecting the target organ to a Hore 1-3-3-1 signal. The subjecting of the target organ to an offsetting spin-echo sequence preferably involves subjecting the target organ to a spin-echo sequence which offsets gradient and spin echoes resulting in a phase difference between the response from the target organ and a response from fat.

5271399, Dec 21, 1993

Nov 27, 1991

7/799359

John Listerud - Philadelphia PA
Scott Atlas - Princeton NJ

Trustees of the University of Pennsylvania - Philadelphia PA

A61B 5055

1286533

Methods for producing an angiograph of a body portion are disclosed as including the steps of subjecting the body portion to electromagnetic energy so as to cause a response related to the magnetization of the body portion. Fast spin echo magnetic resonance measurements are performed on a three dimensional section of the body portion to generate three dimensional intensity information. The three dimensional intensity information is thereafter processed to construct an angiograph. In a preferred embodiment magnetic resonance data is produced by generating a slice gradient, generating a z axis slab selective 90. degree. pulse, generating a z axis slab selective 180. degree. pulse, generating a first phase encoding gradient pulse for a particular K. sub. y coordinate, generating a second phase encoding gradient pulse for a particular K. sub. z coordinate, and generating an x frequency encoding gradient and reading echo signal data from the body portion resulting from the 180. degree. pulse.