Wei Chun Chang

US Patent:

6459085, Oct 1, 2002

Filed:

Oct 26, 1999

Appl. No.:

09/427362

Inventors:

Wei Chang - Lisle IL
Kenneth Matthews - Chicago IL
Caesar Ordonez - Aurora IL

Assignee:

Rush Presbyterian-St. Lukes Medical Center - Chicago IL

International Classification:

G01J 2700

US Classification:

25037011, 25037001, 25037009, 250591, 250367

Abstract:

A device and method for determining the x- and y-positions, as well as the depth of interaction, of an interaction between a gamma ray and a scintillation crystal. In one embodiment, a first and a second sensor array are disposed on opposite sides of a scintillation crystal which is subjected in incident gamma radiation resulting in the release of photons. The first sensor array provides a measurement of the x- and y-positions of the interaction while the second sensor array provides a measurement of the depth-of-interaction. In one embodiment, the first sensor array is a photomultiplier array and the second sensor array is an array of wavelength-shifting fibers.

US Patent:

7683331, Mar 23, 2010

Filed:

Dec 7, 2007

Appl. No.:

11/999901

Inventors:

Wei Chang - Lisle IL, US

Assignee:

Rush University Medical Center - Chicago IL

International Classification:

G01T 1/166

US Classification:

25036304

Abstract:

A single photon emission computed tomography (SPECT) system for cardiac imaging including an open arc-shaped frame. A collimator subsystem is shaped to approximately match the thoracic contour to optimize the geometric efficiency for detecting photons emitted from the heart of patients having different sizes and weights and shaped to surround and position the collimator subsystem closely proximate a heart of a patient of the patients encompassed by at least one predetermined image volume for optimizing collimation of radiation photons emitted from the heart. The collimator subsystem is facilitated by a tracking system that is capable of quickly bringing up the collimator component, which meets a specific set of collimation requirements, into place for imaging. And an open arc-shaped detector system is coupled to the collimator subsystem having a shape closely matching the shape of the collimator subsystem for detecting collimated radiation photons from the collimator subsystem and generating output electrical signals.

US Patent:

7683332, Mar 23, 2010

Filed:

Dec 7, 2007

Appl. No.:

12/001000

Inventors:

Wei Chang - Lisle IL, US

Assignee:

Rush University Medical Center - Chicago IL

International Classification:

G01T 1/166

US Classification:

25036304

Abstract:

This invention features an integrated single photon emission computed tomography (SPECT)/transmission computed tomography (TCT) system for cardiac imaging including an open arc-shaped frame. A collimator system is shaped to approximately match the thoracic contour of patients having different sizes and weights and shaped to surround and position the collimator closely proximate a heart of a patient of said patients encompassed by at least one predetermined image volume for optimizing collimation of radiation photons emitted from the heart. An arc-shaped detector system is coupled to the collimator subsystem having a shape closely matching the shape of the collimator subsystem for detecting collimated radiation photons from the collimator subsystem and generating output electrical signals. A patient positioning subsystem positions a patient to a predetermined central longitudinal axis of the three-dimensional imaging volume and for intermittently and incrementally rotating the patient about the predetermined central longitudinal axis for generating a plurality of TCT images.

US Patent:

54499135, Sep 12, 1995

Filed:

Nov 3, 1993

Appl. No.:

8/147807

Inventors:

Wei Chang - Lisle IL

International Classification:

G01T 1166

US Classification:

25036304

Abstract:

Apparatus for producing attenuation data for compensating a radionuclide emission imaging system. A single photon emission computed tomography (SPECT) system includes a radiation source disposed across the field of view from a detector portion and offset from a diameter through the center of the field of view intersecting a center of the detector portion. The radiation source and detector thereby define an asymmetrical radiation pattern that enlarges an attenuation field of view to provide a more thorough sampling of an object in the field of view.

US Patent:

20160297494, Oct 13, 2016

Filed:

Jun 15, 2016

Appl. No.:

15/183299

Inventors:

- Holdrege NE, US
Zhenghua Kong - Vernon Hills IL, US
Wei Chang - Buffalo Grove IL, US
Yazhao Wang - Suzhou, CN
Kai Wang - Suzhou, CN

International Classification:

B62K 15/00
B62K 3/00

Abstract:

A portable conveyance has a deck, a front drive wheel proximately disposed to a first end of the deck and a rear drive wheel attached proximate to a second end of the deck. A guide roller assembly attached proximate to the rear drive wheel. The guide roller assembly has a first rotational axis and the rear drive wheel rotates about a second rotational axis different from the first rotational axis and parallel to the first rotational axis, such that the guide roller assembly is not in contact with a substantially flat surface when the first and rear drive wheels are in contact with the substantially flat surface, and the guide roller assembly is in rotational contact with the surface when the deck is lifted into a towing position.