Timothy Pa Eagan

US Patent:

7180291, Feb 20, 2007

Filed:

Nov 25, 2003

Appl. No.:

10/536334

Inventors:

Thomas Chmielewski - Willoughby Hills OH, US
James A. Flock - Euclid OH, US
Timothy Eagan - Cleveland OH, US

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

G01V 3/00

US Classification:

324318, 324322

Abstract:

A birdcage coil () used in conjunction with a magnetic resonance imaging apparatus includes a first conductive loop (), a second conductive loop (), and a plurality of first conductor rungs () disposed between the first and second conductive loops. A third conductor () is coupled to the second conductive loop at resonance frequencies, such as by second conductor rungs (). The birdcage coil also includes switches () for switching the birdcage coil at least among: 1) an RF transmit mode to operate as an RF transmit coil; and 2) an RF receive mode to operate as an RF receive coil.

US Patent:

7375526, May 20, 2008

Filed:

Oct 20, 2006

Appl. No.:

11/551413

Inventors:

William A. Edelstein - Schenectady NY, US
Tesfaye K. Kidane - Shaker Heights OH, US
Tanvir N. Baig - Cleveland OH, US
Timothy P. Eagan - Shaker Heights OH, US
Robert W. Brown - Solon OH, US

International Classification:

G01V 3/00

US Classification:

324318, 324307

Abstract:

The present invention provides an apparatus for reducing acoustic noise in a magnetic resonance imaging device including passive shielding located outside the actively shielded gradient winding elements in order to reduce the magnitude of fields that spread outside the gradient coil assembly in unwanted directions and interact with the magnet cryostat or other metallic magnet parts, inducing eddy currents that cause consequent acoustic noise. The passive shielding elements are conducting layers located on the outer radius of the cylindrical gradient coil assembly in a cylindrical magnet system, conducting layers located at the ends of the gradient coil assembly in a cylindrical magnet system, and conducting layers located inside the actively shielded gradient winding inner elements in a cylindrical magnet system. The passive shielding could also be located on separate structures that are vibrationally isolated from the magnet cryostat. The actively shielded gradient winding can also be extended to portions at the ends of the actively shielded gradient winding and further to portions inside the inner radius of the inner portion of the actively shielded gradient winding.

US Patent:

20050046422, Mar 3, 2005

Filed:

Aug 25, 2004

Appl. No.:

10/925691

Inventors:

William Edelstein - Schenectady NY, US
Tesfaye Kidane - Shaker Heights OH, US
Tanvir Baig - Cleveland OH, US
Timothy Eagan - Shaker Heights OH, US
Robert Brown - Solon OH, US

International Classification:

G01V003/00

US Classification:

324307000

Abstract:

The present invention provides an apparatus for reducing acoustic noise in a magnetic resonance imaging device including passive shielding located outside the actively shielded gradient winding elements in order to reduce the magnitude of fields that spread outside the gradient coil assembly in unwanted directions and interact with the magnet cryostat or other metallic magnet parts, inducing eddy currents that cause consequent acoustic noise. The passive shielding elements are conducting layers located on the outer radius of the cylindrical gradient coil assembly in a cylindrical magnet system, conducting layers located at the ends of the gradient coil assembly in a cylindrical magnet system, and conducting layers located inside the actively shielded gradient winding inner elements in a cylindrical magnet system. The passive shielding could also be located on separate structures that are vibrationally isolated from the magnet cryostat. The actively shielded gradient winding can also be extended to portions at the ends of the actively shielded gradient winding and further to portions inside the inner radius of the inner portion of the actively shielded gradient winding. The actively shielded gradient windings and passive shielding should be designed concurrently in order to substantially optimize the gradient linearity and reduce the eddy currents generated in metallic parts of the magnetic resonance imaging system.

US Patent:

20100290683, Nov 18, 2010

Filed:

Oct 29, 2008

Appl. No.:

12/740358

Inventors:

Gordon D. Demeester - Wickliffe OH, US
Michael A. Morich - Mentor OH, US
Timothy P. Eagan - Shaker Heights OH, US

Assignee:

KONINKLIJKE PHILIPS ELECTRONICS N.V. - EINDHOVEN

International Classification:

G06K 9/00

US Classification:

382131

Abstract:

In preparation for acquiring PET image data, subject motion models are built based on physiologic signal monitoring and MR data is collected and used for improved PET imaging. The physiologic signal monitoring is also used during PET imaging, and the acquired MR data is used for prospective or retrospective gating of the PET image acquisition, or in the PET reconstruction for improved correction/imaging.

US Patent:

20100322497, Dec 23, 2010

Filed:

Jun 17, 2010

Appl. No.:

12/817846

Inventors:

James F. Dempsey - Chagrin Falls OH, US
Qingguo Zeng - Twinsburg OH, US
Roger Nana - Oakwood Village OH, US
John L. Patrick - Oakwood Village OH, US
Timothy P. Eagan - Oakwood Village OH, US
Shmaryu M. Shvartsman - Highland Heights OH, US

Assignee:

VIEWRAY, INCORPORATED - Oakwood Village OH

International Classification:

G06K 9/00

US Classification:

382131, 382154

Abstract:

Systems and methods for tomographic reconstruction of an image include systems and methods for producing images from k-space data. A k-space data set of an imaged object is acquired using know k-space data acquisition systems and methods. A portion of the k-space data set is sampled so as to collect some portion of the k-space data. An image is then reconstructed from the collected portion of the k-space data set according to a convex optimization model.

US Patent:

20120229141, Sep 13, 2012

Filed:

Feb 29, 2012

Appl. No.:

13/407852

Inventors:

Robert W. Brown - Cleveland OH, US
Yong Wu - Cleveland OH, US
Zhen Yao - Cleveland OH, US
Shmaryu Shvartsman - Highland Heights OH, US
Thomas Chmielewski - Stow OH, US
Timothy Eagan - Cleveland Heights OH, US

International Classification:

G01R 33/422
B26D 5/00
G06F 17/50

US Classification:

324322, 716110, 83358

Abstract:

Radio frequency (RF) shields used with magnetic resonance imaging (MRI) apparatus may experience gradient field induced eddy currents and RF field induced eddy currents. These eddy currents can cause the RF shield to heat up at an undesirable rate. RF shields are designed to have a desired degree of RF shielding and a desired heating attribute. Design goals for RF shields include gradient field transparency and RF field opacity, both of which can be influenced by eddy currents. Example methods identify a gradient field that will induce eddy currents and identify an RF field that will induce eddy currents. If a region on the RF shield is identified where the desired heating attribute will not be achieved, then a pattern of axial cuts and azimuthal cuts can be made in the RF shield to reduce gradient eddy current heating in the RF shield while maintaining desired RF shielding.

US Patent:

20190012814, Jan 10, 2019

Filed:

Aug 20, 2018

Appl. No.:

16/105848

Inventors:

- Oakwood Village OH, US
Qingguo Zeng - Twinsburg OH, US
Roger Nana - Oakwood Village OH, US
John Lester Patrick - Chagrin Falls OH, US
Timothy P. Eagan - Oakwood Village OH, US
Shmaryu M. Shvartsman - Highland Heights OH, US

Assignee:

ViewRay Technologies, Inc. - Oakwood Village OH

International Classification:

G06T 11/00
G06T 7/00
G01R 33/48
G01R 33/561
G01R 33/56

Abstract:

Systems and methods for tomographic reconstruction of an image include systems and methods for producing images from k-space data. A k-space data set of an imaged object is acquired using know k-space data acquisition systems and methods. A portion of the k-space data set is sampled so as to collect some portion of the k-space data. An image is then reconstructed from the collected portion of the k-space data set according to a convex optimization model.

US Patent:

20150212174, Jul 30, 2015

Filed:

Apr 13, 2015

Appl. No.:

14/685021

Inventors:

- Cleveland OH, US
Yong Wu - Cleveland OH, US
Zhen Yao - Cleveland OH, US
Shmaryu Shvartsman - Highland Heights OH, US
Thomas Chmielewski - Stow OH, US
Timothy Eagan - Cleveland Heights OH, US

International Classification:

G01R 33/422
G01R 33/48
G01R 33/385
G01R 33/565
G01R 33/341

Abstract:

Radio frequency (RF) shields used with magnetic resonance imaging (MRI) apparatus may experience gradient field induced eddy currents and RF field induced eddy currents. These eddy currents can cause the RF shield to heat up at an undesirable rate. RF shields are designed to have a desired degree of RF shielding and a desired heating attribute. Design goals for RF shields include gradient field transparency and RF field opacity, both of which can be influenced by eddy currents. Example methods identify a gradient field that will induce eddy currents and identify an RF field that will induce eddy currents. If a region on the RF shield is identified where the desired heating attribute will not be achieved, then a pattern of axial cuts and azimuthal cuts can be made in the RF shield to reduce gradient eddy current heating in the RF shield while maintaining desired RF shielding.

Address:

12700 Fairhill Rd APT 202, Cleveland, OH 44120

VIN:

2HGFG12607H527301

Make:

HONDA

Model:

CIVIC

Year:

2007