Christopher B Matthews

US Patent:

6359279, Mar 19, 2002

Filed:

Dec 7, 1998

Appl. No.:

09/206508

Inventors:

Daniel Gagnon - Twinsburg OH
Christopher G. Matthews - Lyndhurst OH

Assignee:

Picker International, Inc. - Cleveland OH

International Classification:

F01T 1166

US Classification:

2503631, 2503601, 25037009

Abstract:

A radiation detector includes slit collimator. A radiation detector receives radiation which has been received in each of the slits. The aspect ratio of the detector is approximately three, and each semiconductor radiation detector has a transverse dimension which is less than that of its respective slit. A reconstruction processor generates an image indicative of the radiation received by the detectors. The detector may be rotated about a fixed axis. Alternately, the detector may be translated in coordination with its rotation to provide a substantially square field of view.

US Patent:

6552349, Apr 22, 2003

Filed:

Jan 8, 2002

Appl. No.:

10/041198

Inventors:

Daniel Gagnon - Twinsburg OH
Christopher G. Matthews - Lyndhurst OH

Assignee:

Koninklijke Philips Electronics N.V.

International Classification:

G01T 120

US Classification:

2503631, 2503601, 25037009

Abstract:

A radiation detector includes a slit collimator. A radiation detector receives radiation which has been received in each of the slits. The aspect ratio of the detector is approximately three, and each semiconductor radiation detector has a transverse dimension which is less than that of its respective slit. A reconstruction processor generates an image indicative of the radiation received by the detectors. The detector may be rotated about a fixed axis. Alternately, the detector may be translated in coordination with its rotation to provide a substantially square field of view.

US Patent:

6727502, Apr 27, 2004

Filed:

Jun 27, 2001

Appl. No.:

09/893934

Inventors:

Christopher G. Matthews - Lyndhurst OH
Wenli Wang - Aurora OH

Assignee:

Koninklijke Philips Electronics, N.V. - Eindhoven

International Classification:

G01T 1164

US Classification:

25036303, 25036302

Abstract:

An imaging method using a plurality of radiation detectors ( ) is disclosed. A plurality of coincidence radiation events are measured ( ) associated with a point radiation source ( ). Initial values are assigned ( ) for fitting parameters. Lines of response (LOR) are calculated ( ) based upon the fitting parameters and the measured radiation events. A figure of merit is generated ( ) that characterizes the apparent size of the point radiation source based upon the LORs. The fitting parameters are optimized ( ) using a minimization algorithm which includes iteratively repeating the calculating ( ) and generating ( ) steps to produce a minimized figure of merit. Correction factors are extracted from the optimized fitting parameters ( ). A set of radiation data is acquired from an associated subject. The radiation data is corrected for mechanical camera misalignment by correcting the spatial coordinates of the detected radiation events using the correction factors.

US Patent:

D535375, Jan 16, 2007

Filed:

Oct 6, 2005

Appl. No.:

29/239948

Inventors:

William H. Walker - Fairlawn OH, US
Thomas E. Hanna - Wooster OH, US
Christopher R. Matthews - Windsor MA, US
Debra Lynn Miersma - Dalton MA, US

Assignee:

Rubbermaid Incorporated - Fairlawn OH

International Classification:

2899

US Classification:

D23366

US Patent:

62947885, Sep 25, 2001

Filed:

Aug 18, 1999

Appl. No.:

9/377009

Inventors:

Steven E. Cooke - Garfield Heights OH
Christopher G. Matthews - Lyndhurst OH
John F. Vesel - Christina Dr. OH

Assignee:

Marconi Medical Systems, Inc. - Highland Heights OH

International Classification:

G01T 1172

US Classification:

25036303

Abstract:

In positron emission imaging, coincident gamma ray pairs are acquired and processed to generate an image. Random gamma ray pairs in the acquired coincidence data degrade the quality of the resultant image. The coincident gamma ray pairs are re-paired to generate non-coincident gamma ray pairs. The non-coincident pairs are used to correct for randoms in the acquired coincidence data. Alternately, singles gamma rays may be detected and paired with non-coincident single gamma rays to generate non-coincident pairs. These pairs may be used to correct for randoms in the acquired coincidence data.

US Patent:

61473537, Nov 14, 2000

Filed:

May 29, 1998

Appl. No.:

9/086947

Inventors:

Daniel Gagnon - Twinsburg OH
Christopher G. Matthews - Lyndhurst OH
Frank P. DiFilippo - Strongsville OH

Assignee:

Picker International, Inc. - Cleveland OH

International Classification:

G01T 1166

US Classification:

25036305

Abstract:

A gamma camera includes first and second detectors which face an examination region. The detectors are rotatable about the examination region and translatable in a direction tangential to the examination region. Translation of the detectors is coordinated with the rotation of the detectors about the examination so as to increase the effective field of view of the detectors. In a first embodiment, the detectors are translated in the transverse direction when the detectors are located at each of a plurality of positions about the examination region. In a second embodiment, translation of the detectors is coordinated such that, for a given projection angle, the first detector is used to detect radiation data from a subset of the region of interest.