Vijay Thakur Shamdasani

US Patent:

20100094131, Apr 15, 2010

Filed:

Oct 2, 2007

Appl. No.:

12/444122

Inventors:

Unmin Bae - Seattle WA, US
Yongmin Kim - Lake Forest Park WA, US
Vijay Shamdasani - Seattle WA, US

Assignee:

WASHINGTON, UNIVERSITY OF - Seattle WA

International Classification:

A61B 8/14
A61B 8/00
G06K 9/00

US Classification:

600438, 600443, 382131

Abstract:

An in vivo source of compression is used to cause a bodily structure of interest to expand and contract. Ultrasound signals are incident and their echoes are processed by a strain processor. Resulting strain images are freed from noise caused external sources of compression. A tissue stiffness index is calculated to obtain quantitative measure of stiffness.

US Patent:

20120165670, Jun 28, 2012

Filed:

Aug 25, 2010

Appl. No.:

13/393998

Inventors:

William Tao Shi - Briarcliff Manor NY, US
Francois Guy Gerard Marie Vignon - Croton on Hudson NY, US
Jeffry Earl Powers - Bainbridge Island WA, US
Brent Stephen Robinson - Christchurch, NZ
Michael Richard Burcher - Impington, GB
Vijay Shamdasani - Seattle WA, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS N.V. - EINDHOVEN

International Classification:

A61B 8/13

US Classification:

600442

Abstract:

Ultrasound aberration, especially in transcranial imaging or therapy, is corrected by capturing the laterally two-dimensional nature of the aberration in the ultrasound being received, as by means of a two-dimensional receiving transducer array (). In some embodiments, transmissive ultrasound () is applied through the temporal window and is, for example, emitted from one or more real or virtual point sources () at a time, each point source being a single transducer element or patch or the geometrical focus of a collection of elements or patches. A patch may serve, in one aspect as a small focused transducer in the near field. A contralateral array () is, in one version, comprised of the point sources. In some aspects, aberration maps structured, independent-variable-wise, to correspond to the array structure of the receiving transducer embody aberration estimates, the ultrasound device being configured for improving ultrasound operation by modifying device settings to improve the location of ultrasound reception/transmission or correct beamforming. Enhancements include beam placement visualization, and intensity and beam shape prediction.

US Patent:

20120323123, Dec 20, 2012

Filed:

Sep 30, 2010

Appl. No.:

13/500527

Inventors:

Unmin Bae - Kenmore WA, US
Donna Lynn Richmond - Raleign NC, US
Alexey Viktorovich Cherepakhin - Lake Forest Park WA, US
Zhaowen Yang - Sammamish WA, US
Vijay Shamdasani - Kenmore WA, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS N.V. - EINDHOVEN

International Classification:

A61B 8/14

US Classification:

600443

Abstract:

This invention relates to a method of ultrasonically imaging a region of interest that may contain anechoic and/or hypoechoic echoes.The method comprises the steps of:Doing so, an anechoic image produced by the method of the invention emphazises the rendering of anechoic and/or hypoechoic areas over echoic ones.

US Patent:

20130131511, May 23, 2013

Filed:

Nov 15, 2010

Appl. No.:

13/511307

Inventors:

Roy Beck Peterson - Seattle WA, US
Yan Shi - White Plains NY, US
Hua Xie - Ossining NY, US
Jean-Luc Robert - White Planins NY, US
Vijay Shamdasani - Seattle WA, US
Robert Randall Entrekin - Kirkland WA, US
Anna Teresa Fernandez - Falls Church VA, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS N.V. - EINDHOVEN

International Classification:

A61B 8/08
A61B 8/00
A61B 8/14

US Classification:

600438

Abstract:

An ultrasonic diagnostic imaging system produces an image of shear wave velocities by transmitting push pulses to generate shear waves. A plurality of tracking lines are transmitted and echoes received by a focusing beamformer adjacent to the location of the push pulses. The tracking lines are sampled in a time-interleaved manner. The echo data acquired along each tracking line is processed to determine the time of peak tissue displacement caused by the shear waves at points along the tracking line, and the times of peaks at adjacent tracking lines compared to compute a local shear wave velocity. The resultant map of shear wave velocity values is color-coded and displayed over an anatomical image of the region of interest.

US Patent:

20130317362, Nov 28, 2013

Filed:

Dec 19, 2011

Appl. No.:

13/995522

Inventors:

Yan Shi - White Plains NY, US
Hua Xie - Ossining NY, US
Roy Peterson - Seattle WA, US
Jean-Luc Robert - White Plains NY, US
Vijay Shamdasani - Seattle WA, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS N.V. - EINDHOVEN

International Classification:

A61B 8/08
A61B 8/00

US Classification:

600438

Abstract:

The weighted-average-based position () in the temporal domain is computed based on the sampling of shear wave displacement () along the propagation path. The weighting is, for example, by displacement observed at times () corresponding to sampling and represents the time of arrival of the shear wave at the shear-wave propagation path location being sampled. In some embodiments, the computed shear-wave times of arrival at respective locations are functionally related to known inter-location distances () to derive shear-wave group velocity. The derived velocity can serve as input into known algorithms for estimating shear elasticity of the medium, such as body tissue, for purposes of clinical diagnosis and therapy assessment.

US Patent:

20140005548, Jan 2, 2014

Filed:

Dec 2, 2011

Appl. No.:

13/992281

Inventors:

John Douglas Fraser - Woodinville WA, US
Roy Peterson - Seattle WA, US
Jean-Luc Robert - White Plains NY, US
Vijay Shamdasani - Seattle WA, US
Hua XIE - Ossining NY, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS N.V. - EINDHOVEN

International Classification:

A61B 8/00
A61B 8/08

US Classification:

600447

Abstract:

An ultrasonic diagnostic imaging system for shear wave measurement transmits push pulses in the form of a sheet of energy. The sheet of energy produces a shear wavefront which is a plane wave, which does not suffer from the 1/R radial dissipation of push pulse force as does a conventional push pulse generated along a single push pulse vector. The sheet of energy can be planar, curved, or in some other two or three dimensional shape. A curved sheet of energy can produce a shear wave source which focuses into a thin line, which increases the resolution and sensitivity of the measuring techniques used to detect the shear wave effect.

US Patent:

20220401078, Dec 22, 2022

Filed:

Nov 22, 2020

Appl. No.:

17/775635

Inventors:

- EINDHOVEN, NL
Hua Xie - Cambridge MA, US
Man M Nguyen - Melrose MA, US
Vijay Thakur Shamdasani - Kenmore MA, US
William Tao Shi - Wakefield MA, US

International Classification:

A61B 8/08
A61B 8/14
A61B 8/00
G01S 15/89

Abstract:

Systems and methods for calculating hepato-renal index (HRI) values from radiofrequency (RF) data are disclosed herein. The RF data may include fundamental frequency components, harmonic frequency components, or a combination thereof. Signal intensities within regions of interest may be calculated from the RF data. The signal intensities may be averaged to arrive at an average signal intensity value for each region of interest. In some examples, some of the highest and/or lowest signal intensity values may be removed prior to averaging. The ratio of the average signal intensities from the different regions of interest may be then be taken to arrive at the HRI values.

US Patent:

20220386996, Dec 8, 2022

Filed:

Aug 11, 2022

Appl. No.:

17/886153

Inventors:

- EINDHOVEN, NL
Vijay Thakur Shamdasani - Kenmore WA, US

International Classification:

A61B 8/08
A61B 8/06
A61B 8/00

Abstract:

An ultrasonic diagnostic imaging system acquires different kinds of pilot images showing different characteristics of a region of a body where shearwave measurements are performed. The pilot images are analyzed by a push pulse locator to adaptively generate push pulses at locations in the body which minimize or avoid shearwave travel through blood vessels, through regions of stiffness inhomogeneities in the body, or at times when shearwaves are adversely affected by tissue motion.