Jed D Pack

US Patent:

7609802, Oct 27, 2009

Filed:

Apr 25, 2007

Appl. No.:

11/740002

Inventors:

David Allen Langan - Clifton Park NY, US
Peter Michael Edic - Albany NY, US
Xiaoye Wu - Rexford NY, US
Jed Douglas Pack - Glenville NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

A61B 6/00

US Classification:

378 4, 378 15

Abstract:

A method, computed tomography (CT) system and computer-readable medium for reconstructing an image volume of an object scanned in helical mode. An embodiment of the method includes determining discrete focal lengths within an imaging plane of the reconstructed field of view comprising the image volume; generating a circular scan sinogram(s) for the discrete focal lengths by interpolating the helical views; selecting within a backprojection operation a circular scan sonogram(s), for one or more image points within the imaging plane, over one or more circular views. The method then includes using the selected circular scan sinogram(s), in the backprojection of the image points point(s) over the circular views view(s) and performing a backprojection for all the image points over all the circular views to generate a reconstructed image of the object.

US Patent:

7616731, Nov 10, 2009

Filed:

Mar 20, 2007

Appl. No.:

11/725891

Inventors:

Jed Douglas Pack - Glenville NY, US
Zhye Yin - Schenectady NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H05G 1/60
H05G 1/64

US Classification:

378 10, 378 9, 378 19

Abstract:

Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a non-sequential activation is employed to acquire mathematically complete or sufficient projection data. In another embodiment, a distributed source is provided as a generally semicircular segment. In such an embodiment, an alternating activation scheme may be employed to allow one or more helices of image data to be acquired.

US Patent:

7706499, Apr 27, 2010

Filed:

Mar 20, 2007

Appl. No.:

11/725892

Inventors:

Jed Douglas Pack - Glenville NY, US
Zhye Yin - Schenectady NY, US
Samit Kumar Basu - Niskayuna NY, US
John Charles Hill - Rexford NY, US
Peter Michael Edic - Albany NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H05G 1/60

US Classification:

378 9, 378 10

Abstract:

Systems and methods are provided for acquiring and reconstructing projection data using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a non-sequential activation of X-ray source locations on an annular source is employed to acquire projection data. In another embodiment, a distributed source is tilted relative to an axis of the scanner to acquire the projection data. In a further embodiment, a plurality of X-ray source locations on an annular source are activated such that the aggregated signals correspond to two or more sets of spatially interleaved helical scan data.

US Patent:

7778386, Aug 17, 2010

Filed:

Apr 27, 2007

Appl. No.:

11/741359

Inventors:

Zhye Yin - Schenectady NY, US
Jed Douglas Pack - Glenville NY, US
Bruno K. B. De Man - Clifton Park NY, US
Norbert J. Pelc - Los Altos CA, US

Assignee:

General Electric Company - Schenectady NY
The Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

A61B 6/03

US Classification:

378 9, 378 4, 382121

Abstract:

Disclosed are embodiments of methods for reconstructing x-ray projection data (e. g. , one or more sinograms) acquired using a multi-source, inverse-geometry computed tomography (“IGCT”) scanner. One embodiment of a first method processes an IGCT sinogram by rebinning first in “z” and then in “xy,” with feathering applied during the “xy” rebinning. This produces an equivalent of a multi-axial 3generation sinogram, which may be further processed using a parallel derivative and/or Hilbert transform. A TOM-window (with feathering) technique and a combines backprojection technique may also be applied to produce a reconstructed volume. An embodiment of a second method processes an IGCT sinogram using a parallel derivative and/or redundancy weighting. The second method may also use signum weighting, TOM-windowing (with feathering), backprojection, and a Hilbert Inversion to produce another reconstructed volume.

US Patent:

7792238, Sep 7, 2010

Filed:

Feb 18, 2008

Appl. No.:

12/032810

Inventors:

Jed Douglas Pack - Glenville NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

A61B 6/00

US Classification:

378 4

Abstract:

A method for generating an image of an object is provided. The method comprises acquiring projection data at one or more projection views along a circular scan trajectory and generating a corrected projection dataset based upon a weighted derivative applied to a subset of the projection data. The method further comprises backprojecting the corrected projection dataset along one or more projection rays associated with one or more of the projection views, to generate a reconstructed image of the object.

US Patent:

7826587, Nov 2, 2010

Filed:

Sep 11, 2009

Appl. No.:

12/558248

Inventors:

David Allen Langan - Clifton Park NY, US
John Eric Tkaczyk - Delanson NY, US
James Walter LeBlanc - Niskayuna NY, US
Colin R. Wilson - Niskayuna NY, US
Xiaoye Wu - Rexford NY, US
Dan Xu - Schenectady NY, US
Thomas Matthew Benson - Clifton Park NY, US
Jed Douglas Pack - Glenville NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H05G 1/60

US Classification:

378 16, 378 20

Abstract:

A CT system includes a gantry, an x-ray source, a generator configured to energize the x-ray source to a first kVp and to a second kVp, a detector, and a controller. The controller is configured energize the x-ray source to the first kVp for a first time period, subsequently energize the x-ray source to the second kVp for a second time period, integrate data for a first integration period that includes a portion of a steady-state period of the x-ray source at the first kVp, integrate data for a second integration period that includes a portion of a steady-state period of the x-ray source at the second kVp, compare a signal-to-noise ratio (SNR) during the first integration period (SNR) and the second integration period (SNR), adjust an operating parameter of the CT system to optimize an SNRwith SNR, and generate an image using the integrated data.

US Patent:

7835486, Nov 16, 2010

Filed:

Mar 20, 2007

Appl. No.:

11/726023

Inventors:

Samit Kumar Basu - Niskayuna NY, US
Bruno De Man - Clifton Park NY, US
Jed Douglas Pack - Glenville NY, US
Xiaoye Wu - Rexford NY, US
Zhye Yin - Schenectady NY, US
Peter Michael Edic - Albany NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G01N 23/083

US Classification:

378 9, 378 10

Abstract:

Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a distributed source is provided as arcuate segments offset in the X-Y plane and along the Z-axis.

US Patent:

7933375, Apr 26, 2011

Filed:

Jun 29, 2007

Appl. No.:

11/771297

Inventors:

Jed Douglas Pack - Glenville NY, US

Assignee:

Morpho Detection, Inc. - Newark CA

International Classification:

A61B 6/03

US Classification:

378 4, 378901

Abstract:

A CT imaging system includes a computer that is programmed to rebin cone beam projection data into a series of two-dimensional sinograms based on an optimized ray consistency approach. The computer receives cone beam data from a detector array and is programmed to specify a plurality of view angles for the cone beam data. The computer selects a plurality of measured rays for each of the plurality of specified view angles, the plurality of measured rays having a view angle approximate to the specified view angle as determined by an optimized ray consistency. The computer also forms a two-dimensional sinogram for each of the plurality of specified view angles based on the selected plurality of measured rays. The computer then defines an image surface for each of the plurality of specified view angles based on the selected plurality of measured rays.