Bob Wei Hu

US Patent:

7466303, Dec 16, 2008

Filed:

Feb 10, 2004

Appl. No.:

10/776421

Inventors:

Dingrong Yi - Toronto, CA
Graham Arnold Wright - Toronto, CA
Bob Sueh-Chien Hu - Palo Alto CA, US

Assignee:

Sunnybrook Health Sciences Center - Toronto, Ontario

International Classification:

G09G 5/00

US Classification:

345156, 345157, 345158, 606 1

Abstract:

A device and software system with input and output capability for manipulating real and virtual objects in 3-dimensional space. The device consists of a six degree-of-freedom mechanical armature that has sensors to determine the location and orientation of a stylus and planar surface. In the input mode, manipulation of the physical armature will result in a corresponding two-dimensional, virtual image of the stylus and surface on a computer screen. The armature also has motors to automatically change the armature location and orientation in order to generate a physical representation in the real world of the location and orientation of a virtual object. The armature is built so that it maintains balance at any location and orientation to statically maintain the armature location and orientation without drifting to a null rest position.

US Patent:

8347738, Jan 8, 2013

Filed:

May 9, 2008

Appl. No.:

12/151963

Inventors:

Alexander Tung - Mountain View CA, US
Günter Niemeyer - Mountain View CA, US
David Liang - Menlo Park CA, US
Byong-Ho Park - Cincinnati OH, US
Friedrich B. Prinz - Woodside CA, US
Bob S. Hu - Stanford CA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

G01L 1/22

US Classification:

73862

Abstract:

This invention provides small position sensors for applications where localized sensing in a small volume of space is needed but where measurement of large relative displacement is also necessary. The invention enables a surgeon to accurately position the tip of a catheter during minimally invasive therapy. The current invention further improves the quality of tactile feedback to a physician during catheter-based surgeries with an axial force sensor at the tip of the catheter that allows for the transmission of force information to the physician. One embodiment of this invention is a position sensor for active interventional catheters, where the sensor may be laser-machined shape memory alloy (SMA), and the catheter actuators may be heated SMA or wire-pulleys. Providing position feedback from a catheter during minimally invasive therapy allows for closed-loop control of the catheter tip position under computer-aided guidance and enable force feedback to the physician.

US Patent:

20120146641, Jun 14, 2012

Filed:

Dec 8, 2011

Appl. No.:

13/374045

Inventors:

Holden H. Wu - Mountain View CA, US
Bob S. Hu - Los Altos CA, US

International Classification:

G01R 33/48

US Classification:

324309

Abstract:

A 5-dimensional imaging method and system is provided to acquire and display the effect of dynamic physiologic changes (either spontaneous or induced) on cardiac function of a patient's heart to elucidate their effects on diastolic myocardial function. In a patient free-breathing magnetic resonance imaging study, 3-dimensional spatial information is encoded by a non-Cartesian 3-dimensional k-space readout trajectory and acquired concurrently with recordings of cardiac and respiratory cycles. The advantage of using non-Cartesian sampling in this invention compared to, for example, Cartesian sampling is higher scan acceleration, improved robustness to motion/flow effects (incoherent instead of coherent artifacts) and robustness to missing data points in k-space.

US Patent:

20130274592, Oct 17, 2013

Filed:

Feb 28, 2013

Appl. No.:

13/780395

Inventors:

Taehoon SHIN - Menlo Park CA, US
Bob Hu - Los Altos Hills CA, US

International Classification:

A61B 5/055

US Classification:

600420, 600410

Abstract:

A method for acquiring a volumetric scan from at least a portion of a body of a subject suspected of exhibiting an observable manifestation of a disease or adverse health condition comprises, with the aid of a radio frequency (RF) source of a magnetic resonance imaging (MRI) system, applying a first RF pulse to the at least the portion of a body of the subject. A detector coil of the MRI system can then detect magnetic resonance (MR) signals from the at least the portion of the body of the subject. The MR signals can be detected upon a time delay subsequent to the application of the first RF pulse. The MR signals can be stored in a memory location as non-Cartesian data in k-space.

US Patent:

52508986, Oct 5, 1993

Filed:

Aug 9, 1991

Appl. No.:

7/743055

Inventors:

Bob S. Hu - Menlo Park CA
Steven M. Conolly - Menlo Park CA

Assignee:

Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

G01R 3320

US Classification:

324309

Abstract:

Disclosed is a method of detecting NMR signals indicative of a short T. sub. 2 species in the presence of a long T. sub. 2 species by utilizing magnetization transfer between species without requiring an auxiliary RF amplifier and with reduced power deposition (SAR). One or more zero degree RF pulses are applied to a body containing the short T. sub. 2 species and the long T. sub. 2 species with the pulses being at the resonant frequency. The RF pulses provides selective magnetization saturation of the short T. sub. 2 species, and the RF pulses are spaced in time to allow magnetization transfer from the short T. sub. 2 species to the long T. sub. 2 species. Gradients can then be applied to the body for signal localization with signals detected from the long T. sub. 2 species due to magnetization transfer from the short T. sub. 2 species being indicative of the presence of the short T. sub. 2 species.

US Patent:

56513666, Jul 29, 1997

Filed:

May 29, 1996

Appl. No.:

8/655034

Inventors:

David H. Liang - Menlo Park CA
Bob S. Hu - Menlo Park CA

Assignee:

Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

A61B 812

US Classification:

12866206

Abstract:

A simple forward viewing ultrasound catheter includes one or more transducers and an ultrasound mirror supported by a bearing in a sealed end of a catheter with a drive cable imparting relative motion to the transducer and mirror. The mirror directs ultrasound waves forward of the catheter. An optical fiber can be provided to direct a laser beam for ablation of atheroma while under guidance of simultaneous intravascular ultrasound. A portion of a cavity can be simultaneously imaged while an interventional device operates on the imaged portion of the cavity.

US Patent:

56069758, Mar 4, 1997

Filed:

Sep 19, 1994

Appl. No.:

8/309540

Inventors:

David H. Liang - Menlo Park CA
Bob S. Hu - Menlo Park CA

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

A61B 812

US Classification:

12866206

Abstract:

A simple forward viewing ultrasound catheter includes one or more transducers and an ultrasound mirror supported by a bearing in a sealed end of a catheter with a drive cable imparting relative motion to the transducer and mirror. The mirror directs ultrasound waves forward of the catheter. An optical fiber can be provided to direct a laser beam for ablation of atheroma while under guidance of simultaneous intravascular ultrasound.

US Patent:

53090993, May 3, 1994

Filed:

Aug 7, 1992

Appl. No.:

7/926982

Inventors:

Pablo Irarrazabal - Stanford CA
Bob S. Hu - Menlo Park CA
John Pauly - San Francisco CA

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

G01V 300

US Classification:

324306

Abstract:

Real-time spatially localized velocity distribution is measured using magnetic resonance techniques by first exciting a region of interest using an RF excitation pulse simultaneously with gradient pulses along two orthogonal axes. A cyclical read-out gradient is then applied along a read-out axis and a magnetic resonance signal is continuously sampled while the read-out gradient is applied. The excitation and read-out is repeated at time intervals to obtain time varying spatially localized velocities within the region of interest.