Koichi Oshio

US Patent:

6519354, Feb 11, 2003

Filed:

Sep 14, 1999

Appl. No.:

09/395556

Inventors:

Koichi Oshio - Brookline MA

Assignee:

Brigham and Womens Hospital, Inc. - Boston MA

International Classification:

G06K 900

US Classification:

382130, 382285

Abstract:

The present invention creates detailed 2D images from 3D sets of angiographic data. First, a 3D set of angiographic data is acquired. Next, one determines from which perspective they wish to view the 3D data. After the perspective is selected, for each pixel in the 2D image to be created, an imaginary ray is extended through the 3D data set, according to the perspective from which the 2D image is being rendered. For each ray, the n most intense data points intersected by that ray are selected and summed together. Finally, the 2D image is created on a pixel by pixel basis, with each pixel being displayed according to the sum of the n most data points intersected by the ray associated with that pixel.

US Patent:

7020318, Mar 28, 2006

Filed:

May 22, 2002

Appl. No.:

10/153993

Inventors:

Koichi Oshio - Santa Rosa CA, US
David A. Feinberg - Bodega Bay CA, US
Matthias Guenther - Sebastopol CA, US

Assignee:

Advanced MRI Technologies, LLC - Sebastopol CA

International Classification:

G06K 9/00

US Classification:

382131, 382130, 382132, 600410, 128922

Abstract:

MR imaging produces a projection image showing better image contrast between small blood vessels and background than traditional net intensity projection (NIP) images but more visual clues to vessel depth than traditional maximum intensity projection (MIP) images.

US Patent:

RE356565, Nov 11, 1997

Filed:

Aug 15, 1995

Appl. No.:

8/515177

Inventors:

David A. Feinberg - New York NY
Koichi Oshio - Brookline MA

Assignee:

Brigham & Women's Hospital, Inc. - Boston MA

International Classification:

G01V 300

US Classification:

324309

Abstract:

Fast magnetic resonance imaging uses combined gradient echoes and spin echoes. In each of one or more TR intervals, after an initial NMR RF nutation pulse, a sequence of 180. degree. RF nutation pulses is used to refocus the RF response into corresponding string of spin echoes. However, in addition, during the time that such spin echo would normally occur after each such 180. degree. RF nutation pulse, a plurality of alternating polarity read-out magnetic gradient pulses is utilized so as to very rapidly form a sub-sequence of gradient echoes. This fast multi-section MRI sequence utilizes the speed advantages of gradient refocusing while overcoming the image artifacts arising from static field homogeneity and chemical shift. Image contrast is still determined by the T2 contrast in Hahn spin echoes. A novel k-space trajectory temporally modulates signals and demodulates artifacts.

US Patent:

52706540, Dec 14, 1993

Filed:

Jul 5, 1991

Appl. No.:

7/727229

Inventors:

David A. Feinberg - Berkeley CA
Koichi Oshio - Brookline MA

International Classification:

G01V 300

US Classification:

324309

Abstract:

Fast magnetic resonance imaging uses combined gradient echoes and spin echoes. In each of one or more TR intervals, after an initial NMR RF nutation pulse, a sequence of 180. degree. RF nutation pulses is used to refocus the RF response into corresponding string of spin echoes. However, in addition, during the time that such spin echo would normally occur after each such 180. degree. RF nutation pulse, a plurality of alternating polarity read-out magnetic gradient pulses is utilized so as to very rapidly form. a sub-sequence of gradient echoes. This fast multi-section MRI sequence utilizes the speed advantages of gradient refocusing while overcoming the image artifacts arising from static field homogeneity and chemical shift. Image contrast is still determined by the T2 contrast in Hahn spin echoes. A novel k-space trajectory temporally modulates signals and demodulates artifacts.