Douglas Leroy Boyd

6735271, May 11, 2004

Nov 28, 2000

09/728481

Roy E. Rand - Palo Alto CA
Jonathan Harman - Pacifica CA
Douglas P. Boyd - Hillsborough CA

GE Medical Systems Global Technology Company LLC - Waukesha WI

H05G 160

378 4, 378 15

A scanning electron beam computed tomographic system eliminates axial offset between target and detector by disposing the target, collimator, and detector such that active portions of the target and detector are always diametrically opposite each other. This result is achieved by providing a helical target, collimator, and detector, or by providing planar target, collimator, and detector components that are inclined relative to the vertical axis such that active portions of the target and detector are always diametrically opposite each other. Either configuration eliminates cone beam error and the necessity to correct for same. Further, the system can provide multi-slice scanning of an object that is in constant motion at a critical velocity, without having to interpolate data. Conventional helical scanning may still be undertaken. Detector elements can be disposed axially to improve signal/noise ratio and to produce a cone beam cancellation effect.

6934357, Aug 23, 2005

Jul 23, 2003

10/625719

Douglas Perry Boyd - Hillsborough CA, US
Geordie Henry Zapalac - Nevada City CA, US
Peter Michael Edic - Albany NY, US

GE Medical Systems Global Technology Company LLC - Waukesha WI

G01N020/083

378 62, 378 8, 378901

A method for facilitating a reduction in motion artifacts includes comparing two sequential scanned images to determine motion.

7020232, Mar 28, 2006

Feb 21, 2003

10/371467

Roy E. Rand - Palo Alto CA, US
Jonathan Harman - Pacifica CA, US
Douglas P. Boyd - Hillsborough CA, US

GE Medical Systems Global Technology Company, LLC - Waukesha WI

H05G 1/60

378 4, 378 10

A scanning electron beam computed tomographic system eliminates axial offset between target and detector by disposing the target, collimator, and detector such that active portions of the target and detector are always diametrically opposite each other. This result is achieved by providing a helical target, collimator, and detector, or by providing planar target, collimator, and detector components that are inclined relative to the vertical axis such that active portions of the target and detector are always diametrically opposite each other. Either configuration eliminates cone beam error and the necessity to correct for same. Further, the system can provide multi-slice scanning of an object that is in constant motion at a critical velocity, without having to interpolate data. Conventional helical scanning may still be undertaken. Detector elements can be disposed axially to improve signal/noise ratio and to produce a cone beam cancellation effect.

7020511, Mar 28, 2006

Aug 14, 2002

10/064756

Douglas P. Boyd - Hillsborough CA, US
Susan E. Candell - Lafayette CA, US

GE Medical Systems Global Technology Company, LLC - Waukesha WI

A61B 5/05

600428, 600407, 600410, 600413, 600415, 600425, 600476, 600479, 378 4, 378 10, 378 12, 378 14, 378 19, 378 20, 378 21, 378114, 378115, 378450, 378483

Certain embodiments of the present invention provide a method for three-dimensional cine EBA/CTA imaging. The method includes monitoring a cardiac cycle of a patient and selecting a trigger point along the cardiac cycle. When the cardiac cycle of the patient reaches the trigger point, a computed tomography (CT) scan of the patient is initiated. At least two CT scans of the patient are performed during a time period over two or more cardiac cycles. A cine angiography image is constructed from the at least two CT scans.

20030161440, Aug 28, 2003

Aug 14, 2002

10/064757

Douglas Boyd - Hillsborough CA, US
Susan Candell - Lafayette CA, US

H05G001/64

378/098120

Certain embodiments of the present invention provide a method and system for cine EBA/CTA imaging. The method includes positioning a patient at a first position in a CT scanner, scanning the patient during a first sweep beginning at a first triggering event, moving the patient to a second position, scanning the patient in a second sweep beginning at a second triggering event, and forming a series of motion images based on at least the first and second sweeps.

41387210, Feb 6, 1979

Nov 11, 1976

5/741128

Douglas P. Boyd - Woodside CA

Board of Trustees of The Lelane Standard Junior University - Stanford CA

G01M 2300

364414

A fan-shaped beam or a fan array of individual beamlets of penetrating radiation, such as X-ray or. gamma. -ray radiation, is directed through a planar slice of the body to be analyzed to a position sensitive detector. The fan beam and the detector are caused to move in a rectilinear or nearly rectilinear fashion so that the individual beamlets or rays of penetrating radiation scan across the body and each detector records a parallel ray shadowgraph at a different angle of rotation (scan angle) with respect to the body and covering a range of scan angles less than 180. degree. and typically approximately 90. degree. The recorded shadowgraphic data is then reconstructed into a 3-D tomograph of the body using a method of successive approximations. The resultant scanner may be used to analyze planes of the body parallel to the major axis thereof such as saggital or coronal as well as transaxial planes. In a preferred embodiment, the position sensitive detector includes detector elements arranged for detecting penetrating radiation passing through the body in a number of divergent planes diverging from the source.

40754928, Feb 21, 1978

Nov 29, 1974

5/528026

Douglas P. Boyd - Palo Alto CA
Michael Goitein - Milton MA

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

G01N 2134

250445T

A fan-shaped beam of penetrating radiation, such as X-ray or. gamma. -ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corresponding to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected. A focussed grid collimator is interposed between the body and the position sensitive detector for collimating the penetrating rays to be detected.

49930559, Feb 12, 1991

Nov 23, 1988

7/275780

Roy E. Rand - Palo Alto CA
Douglas P. Boyd - Hillsborough CA
Kristian R. Peschmann - San Francisco CA

Imatron, Inc. - South San Francisco CA

H01J 3510

378125

X-ray tube includes a rotatable envelope in which is mounted an electron gun at one end and a target anode at the other end. A fixed means for deflecting the electron beam from the electron gun is provided to deflect the electron beam on a fixed path as the envelope of the x-ray tube rotates about an axis. The electron beam being confined to a fixed path results in the electron beam striking various positions of the target anode to provide for improved heat dissipation. The electron beam is deflected along the fixed path using magnetic deflection means including magnetic deflection coils positioned external of the envelope to provide a deflection field transverse to the electron beam. The target anode is cooled by directing a cooling fluid on an external side of the target anode.