Yi Wang

US Patent:

7003343, Feb 21, 2006

Filed:

Apr 1, 2002

Appl. No.:

10/109888

Inventors:

Richard Watts - New York NY, US
Yi Wang - Pittsburgh PA, US
Martin R. Prince - New York NY, US

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

A61B 5/05
G01V 3/00

US Classification:

600410, 600419, 324306

Abstract:

Current bolus chase magnetic resonance angiography is limited by the imaging time for each station. Tailoring the density of k-space sampling along the anterior-posterior direction of the coronal station allows a substantial decrease in scan time that leads to greater contrast bolus sharing among stations and consequently a significant improvement in image quality. Fast arterial-venous transit in the carotid arteries requires accurate, reliable timing of the acquisition to the bolus transit to maximize arterial signal and minimize venous artifacts. The rising edge of the bolus is not utilized in conventional elliptical-centric view ordering because the critical k-space center must be acquired with full arterial enhancement. The invention provides a recessed elliptical-centric view ordering scheme is introduced in which the k-space center is acquired a few seconds following scan initiation. The recessed view ordering is shown to be more robust to timing errors in a patient studies.

US Patent:

7123757, Oct 17, 2006

Filed:

Jun 6, 2002

Appl. No.:

10/164502

Inventors:

Vladimir N. Kolmogorov - New York NY, US
Yi Wang - Pittsburgh PA, US
Ramin Zabih - New York NY, US

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

G06K 9/00

US Classification:

382128

Abstract:

An efficient navigator method is presented that substantially increases the scan efficiency while maintaining the motion suppression effectiveness in magnetic resonance imaging. The method is achieved by simultaneously acquiring different image volumes at different motion states of the subject being scanned. A scheduling algorithm is used to assign volumes to position bins of a motion histogram of the subject. The motion histogram is periodically updated and the volumes are reassigned to position bins.

US Patent:

7545967, Jun 9, 2009

Filed:

Sep 17, 2003

Appl. No.:

10/664425

Inventors:

Martin R. Prince - New York NY, US
Ramin Zabih - New York NY, US
Yi Wang - Pittsburgh PA, US
Richard Watts - Christchurch, NZ
Junhwan Kim - Seoul, KR
Jeff Bezanson - Scarsdale NY, US
Hale Ersoy - Ankara, TR

Assignee:

Cornell Research Foundation Inc. - Ithaca NY

International Classification:

G06K 9/00

US Classification:

382130, 382128, 382131, 382280, 382284, 600425, 600429, 600410, 600419, 600407, 378 21, 378 27, 378 4, 378 62, 128920, 128922

Abstract:

In time-resolved contrast-enhanced magnetic resonance angiography, a measure quantifying image quality provides a basis for generating a linear filtered composite image by facilitating selection of a mask and an arterial phase image for subtraction. Filtering of individual pixels of a temporal series of images provides enhanced contrast in a single image by allowing the temporal behavior of the pixel intensity to denote representation as an artery, vein or background tissue. Motion artifacts are suppressed by re-registering sequential images, adjusting weighting before averaging and subtraction and filtering the Fourier data to eliminate data corrupted by motion or other phenomena.

US Patent:

7734078, Jun 8, 2010

Filed:

Jun 1, 2009

Appl. No.:

12/475797

Inventors:

Martin R. Prince - New York NY, US
Ramin Zabih - New York NY, US
Yi Wang - Pittsburgh PA, US
Richard Watts - Christchurch, NZ
Junhwan Kim - Seoul, KR
Jeff Bezanson - Scarsdale NY, US
Hale Ersoy - Chestnut Hill MA, US

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

G06K 9/00

US Classification:

382130, 382128, 382131, 382280, 382284, 600425, 600429, 600410, 600419, 600407, 378 21, 378 27, 378 4, 378 62

Abstract:

In time-resolved contrast-enhanced magnetic resonance angiography, a measure quantifying image quality provides a basis for generating a linear filtered composite image by facilitating selection of a mask and an arterial phase image for subtraction. Filtering of individual pixels of a temporal series of images provides enhanced contrast in a single image by allowing the temporal behavior of the pixel intensity to denote representation as an artery, vein or background tissue. Motion artifacts are suppressed by re-registering sequential images, adjusting weighting before averaging and subtraction and filtering the Fourier data to eliminate data corrupted by motion or other phenomena.

US Patent:

7941204, May 10, 2011

Filed:

Nov 16, 2005

Appl. No.:

11/281920

Inventors:

Yi Wang - New York NY, US
Pascal Spincemaille - New York NY, US
Thanh D. Nguyen - New York NY, US

International Classification:

A61B 5/05
G01V 3/00

US Classification:

600420, 600410, 324307, 324309

Abstract:

Methods of acquiring magnetic resonance imaging (MRI) data for angiography. The present invention includes novel magnetization preparation schemes where the navigator and fat saturation pulses are executed in steady state after the preparatory pulses in order to minimize the delay between the magnetization preparation and the image echoes. The present invention also provides for improved methods of contrast-enhanced MRI where data are collected along non-linear trajectories through k-space and may also involve novel view ordering. In addition, the present methods employ novel motion corrections that minimize motion artifacts. The present invention further provides novel methods of self-calibrated sensitivity-encoded parallel imaging that allow for accurate and rapid scanning of subjects.

US Patent:

7999548, Aug 16, 2011

Filed:

Aug 26, 2009

Appl. No.:

12/548172

Inventors:

Ryan J. Brown - New York NY, US
Yi Wang - New York NY, US

International Classification:

G01V 3/00
A61B 5/055

US Classification:

324318, 324309, 324307, 600410, 600422

Abstract:

Magnetic resonance imaging of the lower extremities using a coil array having sections of decoupled coil elements that enclose, bilaterally and separately, both legs at the same longitudinal region along the cranial-caudal direction.

US Patent:

8200311, Jun 12, 2012

Filed:

Apr 20, 2007

Appl. No.:

11/737812

Inventors:

Pascal Spincemaille - New York NY, US
Yi Wang - New York NY, US
Martin R. Prince - New York NY, US

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

A61B 5/055

US Classification:

600413, 382128

Abstract:

Described is a robust electrocardiogram (ECG) ordering technique of k-space for breath hold contrast enhanced magnetic resonance angiography (CE-MRA) that acquires the central part of k-space in a motion-free portion of diastole and fills in from the periphery of k-space at all other times. To make maximal use of the contrast enhancement, data is acquired continuously even when the ECG signal is lost. The ECG signal is monitored in real time. The ECG ordering technique allows a flexible acquisition matrix and is robust against ECG signal imperfections. The ECG ordering technique allows thoracic and pulmonary magnetic resonance angiography with a higher resolution when compared to the conventional gated sequence.

US Patent:

8369590, Feb 5, 2013

Filed:

May 21, 2008

Appl. No.:

12/124973

Inventors:

Yi Wang - New York NY, US
Noel C. F. Codella - New York NY, US
Hae-Yeou Lee - Yuseong-gu, KR

Assignee:

Cornell University - Ithaca NY

International Classification:

G06K 9/00

US Classification:

382128, 382131

Abstract:

A method for identifying an attribute of an object represented in an image comprising data defining a predetermined spatial granulation for resolving the object, where the object is in contact with another object. In an embodiment, the method comprises identifying data whose values indicate they correspond to locations completely within the object, determining a contribution to the attribute provided by the data, and identifying additional data whose values indicate they are not completely within the object. The method next interpolates second contributions to the attribute from the values of the additional data and finds the attribute of the object from the first contribution and second contributions. The attribute may be, for example, a volume, and the values may correspond, for example, to intensity.