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Norbert J Pelc

from Los Altos, CA
Age ~66

Norbert Pelc Phones & Addresses

  • 480 Distel Dr, Los Altos, CA 94022
  • Capitola, CA
  • Milwaukee, WI
  • 490 Distel Dr, Los Altos, CA 94022 (650) 387-6666

Work

Position: Professional/Technical

Education

Degree: Graduate or professional degree

Emails

n***p@hotmail.com

Publications

Us Patents

Reduced Field-Of-View Method For Cine Magnetic Resonance Imaging

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US Patent:
6353752, Mar 5, 2002
Filed:
May 14, 1999
Appl. No.:
09/312027
Inventors:
Bruno Madore - Redwood City CA
Norbert J. Pelc - Los Altos CA
Assignee:
Board of Trustees of the Leland Standford Junior University - Palo Alto CA
International Classification:
A61B 5055
US Classification:
600410, 324307, 324309
Abstract:
In some dynamic applications of MRI, only a part of the field-of-view (FOV) actually undergoes dynamic changes. A class of methods, called reduced-FOV (rFOV) methods, convert the knowledge that some part of the FOV is static or not very dynamic into an increase in temporal resolution for the dynamic part, or into a reduction in the scan time. Although cardiac imaging is an important example of an imaging situation where changes are concentrated into a fraction of the FOV, the rFOV methods developed up to now are not compatible with one of the most common cardiac sequences, the so-called retrospective cine method. The present work is a rFOV method designed to be compatible with cine imaging. An increase by a factor n in temporal resolution or a decrease by n in scan time is obtained in the case where only one n of the FOV is dynamic (the rest being considered static). Results are presented for both Cartesian and spiral imaging.

Method For Reducing Image Artifacts Due To Periodic Signal Variations In Nmr Imaging

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US Patent:
4706026, Nov 10, 1987
Filed:
Aug 16, 1985
Appl. No.:
6/766842
Inventors:
Norbert J. Pelc - Wauwatosa WI
Gary H. Glover - Waukesha WI
Assignee:
General Electric Company - Milwaukee WI
International Classification:
G01R 3320
US Classification:
324309
Abstract:
A method for reducing image artifacts due to periodic motion of a subject undergoing examination by nuclear magnetic resoance (NMR) techniques includes the acquisition of scan data for imaging the object. The scan data is composed of a number of views. The acquisition of each view includes the generation of an NMR signal and the application of a magnetic gradient along at least one dimensional axis of the object. The magnetic field gradient is characterized by a parameter value (e. g. , amplitude or direction) adjustable from view to view to encode spatial information into the NMR signal. The method includes the step of selecting the value of the adjustable parameter value for each view. A view order is then selected so as to attempt to obtain a predetermined relationship between the object motion and the adjustable parameter of the magnetic field gradient. The relationship is chosen to minimize artifacts in the reconstructed image.

Method Of Efficient Data Encoding In Dynamic Magnetic Resonance Imaging

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US Patent:
6144873, Nov 7, 2000
Filed:
Apr 17, 1998
Appl. No.:
9/062295
Inventors:
Bruno Madore - Redwood City CA
Gary H. Glover - Stanford CA
Norbert J. Pelc - Los Altos CA
Assignee:
Board of Trustees of The Leland Stanford Junior University - Palo Alto CA
International Classification:
A61B 5055
US Classification:
600410
Abstract:
MRI is used to monitor the time behavior or an organ of interest. Images of such organ may change in time due to physiological motion, and/or due to contrast-agent accumulation. Dynamic applications generally involve acquiring data in a k-t space, which contains both temporal and spatial information. In some dynamic applications, the t axis of the k-t space is not densely filled with information. A method is introduced which can transfer information from the k axes to the t axis, allowing a denser, smaller k-t space to be acquired, and leading to significant reductions in the acquisition time of the temporal frames. Results are presented for cardiac imaging and functional MRI (fMRI). In the case of cardiac imaging, the present method is shown to reduce the data requirement by nearly a factor two. In the case of fMRI, reductions by as much as a factor six can be obtained.

Projection Domain Reconstruction Method For Helical Scanning Computed Tomography Apparatus With Multi-Column Detector Array Employing Overlapping Beams

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US Patent:
5469486, Nov 21, 1995
Filed:
Nov 8, 1993
Appl. No.:
8/151456
Inventors:
Hui Hu - Waukesha WI
Norbert J. Pelc - Los Altos CA
Armin H. Pfoh - New Berlin WI
Assignee:
General Electric Company - Waukesha WI
International Classification:
A61B 603
G01N 23083
US Classification:
378 4
Abstract:
An x-ray computed tomography system for helically scanning a patient translates the patient as projections of the patient at various beam angles are obtained. The projection data are weighted prior to reconstruction to account for multiply measured projection data and the deviation of the cone beam from a parallel beam approximation.

Film-Based Dual Energy Radiography

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US Patent:
4603428, Jul 29, 1986
Filed:
Jan 4, 1985
Appl. No.:
6/688979
Inventors:
John M. Sandrik - Wauwatosa WI
Norbert J. Pelc - Wauwatosa WI
Assignee:
General Electric Company - Schenectady NY
International Classification:
G03C 146
G03B 4202
US Classification:
378174
Abstract:
X-ray energy-difference images are obtained simultaneously by exposing a body to a broad energy spectrum x-ray beam while a radiographic film package is disposed between front and rear x-ray intensifying screens. The film package has two superimposed films with a light-opaque sheet between them. The front screen, on which the polyenergetic image beam emerging from the body is incident, is excited to luminescence by x-ray photons predominantly in one energy band and the rear screen is excited predominantly by photons in another band. The light opaque sheet preferably contains x-ray filter material for additional filtering of photons to increase the fraction of photons at said other band to which the rear screen is sensitive. A shadowgraph of a marker is formed on the film emulsions during x-ray exposure to aid in matching congruent picture elements on each film when the developed films are being read out to obtain signals corresponding to their intensities. Notches in the edges of the films and sheet serve as a code for indicating the type of screens with which the package can be used.

Encoding For Nmr Phase Contrast Flow Measurement

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US Patent:
5093620, Mar 3, 1992
Filed:
Aug 9, 1990
Appl. No.:
7/564945
Inventors:
Norbert J. Pelc - Los Altos CA
Gary H. Glover - Menlo Park CA
Assignee:
General Electric - Milwaukee WI
International Classification:
G01R 3320
US Classification:
324306
Abstract:
In an NMR system a method for measuring the motion of spins moving in an unknown direction includes four separate measurement cycles. The first cycle establishes a reference phase and each of the subsequent three measurement cycles includes motion encoding field gradients for measuring motion along respective pairs of Cartesian coordinates. All four measurements are combined to calculate each of the motion components along x, y and z coordinates.

Method For Increasing Temporal Resolution Of Mr Fluoroscopy

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US Patent:
5697370, Dec 16, 1997
Filed:
Jan 17, 1996
Appl. No.:
8/587409
Inventors:
Norbert J. Pelc - Los Altos CA
Stephen G. Hushek - Brookfield WI
Assignee:
General Electric Company - Waukesha WI
Board of Trustees of the Leland Stanford Jr. University - Stanford CA
International Classification:
A61B 5055
US Classification:
1286532
Abstract:
A method is described for increasing the temporal resolution of MR fluoroscopy procedures. A central portion of the image requiring a higher temporal resolution is updated more frequently using less-than-complete newly acquired NMR data. A running average of the signals produced by peripheral structures is used to form the periphery of the image and to remove artifact-producing data from the less-than-complete NMR data.

Altering Spatial Characteristics Of A Digital Image

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US Patent:
4653013, Mar 24, 1987
Filed:
Nov 19, 1984
Appl. No.:
6/672609
Inventors:
Arthur K. Collins - Waukesha WI
Norbert J. Pelc - Wauwatosa WI
Susan T. Wallenslager - Waukesha WI
Assignee:
General Electric Company - Milwaukee WI
International Classification:
G01D 1514
US Classification:
364518
Abstract:
The values of pixels in a new image matrix are obtained by mapping pixels of the new matrix in the old matrix and then using polynomial interpolation of a plurality of values of pixels in the old matrix to obtain values of interim pixels in the new matrix and then using polynomial interpolation of a plurality of interim values to obtain final values of pixels in the new matrix. A precalculated table of weighting coefficients based on offset of a new pixel from an adjacent old pixel is used to expedite the polynomial interpolation.
Norbert J Pelc from Los Altos, CA, age ~66 Get Report