Yiping Peter Du

8170644, May 1, 2012

Apr 18, 2007

12/297482

Yiping Du - Aurora CO, US

The Regents of the University of Colorado - Denver CO

A61B 5/00

600416, 600410, 324307, 324309, 382128

Mapping of myelin water content in white matter may provide important information for early diagnosis of multiple sclerosis and the detection of white matter abnormality in other diseases. It is disclosed here that free induction decay (FID) of each voxel at multiple slice locations is acquired in the brain using an echo-planar spectroscopic imaging (EPSI) pulse sequence. The multi-slice EPSI acquisition is designed to have a short first echo time (2 ms) and echo-spacing (1 ms) in order to acquire multiple sampling points during the fast decay of the myelin water signal. Multi-compartment analysis is then applied to the FID in each pixel using a 3-pool model of white matter to obtain quantitative maps of the myelin water fraction. Using this technique, the MR data for whole brain mapping of the myelin water can be acquired in less than 10 minutes, making this technique feasible for routine clinical applications.

20110275926, Nov 10, 2011

Jan 16, 2009

12/863729

Yiping Du - Aurora CO, US

The Regents of the University of Colorado - Denver CO

A61B 5/055

600410

Methods, systems, and devices are described for substantially simultaneous acquisition of magnetic resonance angiography (MRA) and magnetic resonance venography (MRV) data. Some embodiments provide susceptibility weighted magnetic resonance imaging of vasculature, including generating a multi-echo pulse sequence having a repetition time, and a first echo and a second echo during the repetition time; acquiring MRA data from at least the first echo; and acquiring MRV data from at least the second echo. The MRA data and/or the MRV data may also be post-processed (e.g., filtered, displayed, etc.). Various embodiments provide additional functionality, including techniques for processing data from an unsampled portion of one echo using sampled data from another echo.

62687301, Jul 31, 2001

May 24, 1999

9/317510

Yiping Du - Towson MD

GE Medical Systems Global Technology Company LLC - Waukesha WI

G01V 300

324309

An MRI system acquired NMR data from which a three-dimensional image of a patient's heart is reconstructed. The NMR data is acquired as a plurality of three-dimensional slabs that are concatenated to reconstruct the image. A plurality of respiratory gating windows are established and NMR data for each slab is acquired during a different one of the respiratory gating windows.

6198289, Mar 6, 2001

Dec 8, 1998

9/207458

Yiping Du - Towson MD
Kevin F. King - New Berlin WI

General Electric Company - Milwaukee WI

G01V 300

324322

In an MR imaging system, a method is provided for operating an MR gradient coil to provide a pulse sequence which comprises first and second sub-sequences. During the first sub-sequence, the coil is operated to produce a pair of diffusion-weighted imaging pulses, each having a gradient amplitude and a slew-rate. During the second sub-sequence the coil is operated to produce a train of echo-planar imaging pulses, each having a gradient amplitude which is selectively less than the amplitude of the diffusion-weighted pulses, and a slew-rate which is selectively greater than the slew-rate of the diffusion-weighted pulses. Thus, the invention is directed to a gradient system which can provide optimal performance for both diffusion-weighted imaging and echo-planar imaging, while using only a single coil for a given gradient axis. At the same time, the system enables gradient performance parameters to be selected so as to ensure that constraints imposed by the Reilly curve will not be exceeded, and to thereby avoid peripheral nerve stimulation.

61448745, Nov 7, 2000

Oct 15, 1998

9/173194

Yiping Du - Towson MD

General Electric Company - Milwaukee WI

A61B 5055

600413

NMR data required to reconstruct an image is divided into central k-space views and peripheral k-space views. NMR navigator signals are acquired during a scan to indicate patient respiration and a first gating signal is produced when respiration is within a narrow acquisition window and a second gating signal is produced when respiration is within a wider acquisition window. Central k-space views are acquired when the first gating signal is produced and peripheral k-space views are acquired when the second gating signal is produced.

62757202, Aug 14, 2001

Mar 16, 1999

9/270351

Yiping Du - Towson MD
Thomas K. F. Foo - Rockville MD

General Electric Company - Schenectady NY

A61B 5055

600410

A method is disclosed for providing a time efficient and accurate measure of the absolute positional displacements of a reference structure in navigator echo MR imaging. The method comprises the steps of operating an MR system to acquire a reference navigator echo associated with the object at a specified reference position, and applying an MR sequence to the object to acquire a set of MR image data when the object is selectively displaced from the reference position. The data set includes an acquired navigator echo having a specified field of view. The method further comprises truncating the acquired navigator echo by means of a selectively positioned truncation window, calculating the difference between linear phase shifts respectively associated with acquired and reference navigator echoes, and displacing the truncation window by an amount representing or corresponding to the phase shift difference in spatial units. Thereupon, the truncating, difference calculation, and truncation window displacement steps are iteratively repeated a specified number of times or when the calculated displacements converge to zero, to provide a final phase shift difference value and an absolute spatial displacement of a reference structure. The final value is used to determine the displacement of the object from the specified reference position when the MR data set is acquired.

62926845, Sep 18, 2001

Dec 14, 1999

9/460686

Yiping Du - Towson MD
Elliot R. McVeigh - Timonium MD

GE Medical Systems Global Technology Company, LLC - Waukesha WI

A61B 5055

600410

Navigator signals are acquired during a cardiac gated MRI scan to measure the position and velocity components of respiratory motion. Acquired cardiac image views are discarded and/or corrected based on the measurement of the positional and velocity components of respiratory motion to reduce motion artifacts. In one embodiment the navigator pulse sequence includes velocity encoding gradient, and in a second embodiment, velocity is determined by measuring the change in diaphragm position between successive navigator pulse sequences.