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Sergio A Lemaitre

from Milwaukee, WI
Age ~64
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Also known as:
Se Lemaitre, Sergio Lemairte, Sergio E
Phone and address:
5428 Lydell Ave, Milwaukee, WI 53217
(414) 963-8729
Related to:
Coretta D Lemaitre, 28Friederike Lemaitre, 65Friederi Lemaitre HoefenerSophia A Lemaitre, 31Friederike Lemaitre, 60
Connected to:
Amanda Lemaitre, 44Bernard J Lemaitre, 90Ellen B Lemaitre, 63Eric J Lemaitre, 53Joel R Lemaitre, 39Nicolas J Lemaitre, 33Theresa C Lemaitre, 33Athena K Lemakis, 55Renee L Lemal, 70Frank S Lemalu, 49

Sergio Lemaitre Phones & Addresses

  • 5428 Lydell Ave, Milwaukee, WI 53217 (414) 963-8729 (414) 964-5302
  • Whitefish Bay, WI
  • 108 Lexington Cir, Chapel Hill, NC 27516
  • 123 Hamilton Rd, Chapel Hill, NC 27514 (919) 932-6562
  • 5428 N Lydell Ave, Milwaukee, WI 53217 (414) 964-5302

Education

Degree: High school graduate or higher

Resumes

Resumes

Sergio Lemaitre Photo 1

Principal Engineer

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Location:
Milwaukee, WI
Industry:
Hospital & Health Care
Work:
GE Healthcare
Development Engineer
Skills:
Medical Devices
Product Development
Engineering
Six Sigma
Testing
Research and Development
Simulations
X Ray Tubes
Ion and Electron Optics Design
Sergio Lemaitre Photo 2

Sergio Lemaitre

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Publications

Us Patents

Cathode For High Emission X-Ray Tube

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US Patent:
6785359, Aug 31, 2004
Filed:
Jul 30, 2002
Appl. No.:
10/064606
Inventors:
Sergio Lemaitre - Whitefish Bay WI
Assignee:
GE Medical Systems Global Technology Company, LLC - Waukesha WI
International Classification:
H01J 3506
US Classification:
378136
Abstract:
A method and apparatus for an x-ray tube having an emitter and a differentially biased emitter-cup cathode configured to provide an electron beam of substantially greater perveance and beam compression ratio than otherwise obtainable with conventional cathode designs is disclosed. The method and apparatus include a cathode assembly opposing an anode and spaced apart therefrom. The cathode is maintained during operation of the x-ray tube at a negative potential with respect to the anode. The cathode assembly includes an emitter for emitting an electron beam to a focal spot on the anode during operation of the x-ray tube and a cathode front member having an aperture defined by the cathode front member on a first side of the emitter. A backing is disposed on a second side of the emitter and is operably connected to the cathode front member via a backing insulator. The cathode further includes a means for applying a differential bias in the cathode assembly to variably change the focal spot size.

Focal Spot Position Adjustment System For An Imaging Tube

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US Patent:
6968039, Nov 22, 2005
Filed:
Aug 4, 2003
Appl. No.:
10/604605
Inventors:
Sergio Lemaitre - Whitefish Bay WI, US
John Scott Price - Wauwatosa WI, US
Assignee:
GE Medical Systems Global Technology Co., LLC - Waukesha WI
International Classification:
H01J035/14
US Classification:
378138, 378136, 378121, 378140
Abstract:
A cathode () for an imaging tube () is provided. The cathode () includes an emitter () that emits an electron beam () to a focal spot () on an anode (). A backing member () is electrically disposed on a second side () of the emitter () and contributes in formation of the electron beam (). A deflection electrode () is electrically disposed between the backing member () and the anode () and adjusts position of the focal spot () on the anode (). A non-contact x-ray source component position measuring system () is also provided. The position measuring system () includes an electromagnetic source () having an electromagnetic radiation source component () and a probe () that directs an emission signal () at and receives a return signal from the electromagnetic radiation source component (). A controller () generates the emission signal () and determines position of the electromagnetic radiation source component () in response to the return signal (). An electron beam focal spot position adjusting system () is also provided.

Rf Accelerator For Imaging Applications

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US Patent:
7206379, Apr 17, 2007
Filed:
Oct 29, 2004
Appl. No.:
10/904229
Inventors:
Sergio Lemaitre - Whitefish Bay WI, US
Assignee:
General Electric Company - Schenectady NY
International Classification:
H01J 35/02
H05G 2/00
US Classification:
378122, 378119, 378121, 378124, 315501
Abstract:
The present invention is an RF cavity for accelerating electrons in imaging applications such as x-ray tubes and CT applications. An RF cavity having electron emitters placed therein accelerates the electrons across the cavity. The geometric shape of the cavity determines the electromagnetic modes that are employed for the acceleration of electrons. The fast electrons are used to generate x-rays by interacting with a target, either a solid or a liquid target. The electron accelerator may be used in an arc source for a stationary computed tomography application, in an x-ray tube, as a booster for an electron gun, and other imaging applications.

Systems, Apparatus And Methods For X-Ray Imaging

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US Patent:
7280637, Oct 9, 2007
Filed:
Mar 28, 2006
Appl. No.:
11/391152
Inventors:
Jizhong Chen - Milwaukee WI, US
Sergio Lemaitre - Whitefish Bay WI, US
Brian Douglas Lounsberry - Thiensville WI, US
International Classification:
H01J 35/06
US Classification:
378136, 378138
Abstract:
A cathode cup is provided. The cathode cup includes one or more pockets; and one or more filaments associated with the one or more pockets. A same number of pockets as filaments are present. Each pocket is associated with exactly one filament and is configured to have a length that is tailored to a length of the filament. The cathode cup can be used in an X-ray system having an anode and a cathode. A method of electron beam shaping is provided. The method includes the following steps. A computer-simulated model of a cathode cup is created. The model is used to predict focal spot dimensions. The predicted focal spot dimensions are compared to desired focal spot dimensions. The steps of creating, using and comparing are repeated until the predicted focal spot dimensions match the desired focal spot dimensions. A cathode cup is created based on the computer-simulated model.

Method And Apparatus To Control Radiation Tube Focal Spot Size

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US Patent:
7409043, Aug 5, 2008
Filed:
May 23, 2006
Appl. No.:
11/439027
Inventors:
Bruce Matthew Dunham - Mequon WI, US
Jonathan Richard Schmidt - Wales WI, US
Sergio Lemaitre - Whitefish Bay WI, US
Assignee:
General Electric Company - Schenectady NY
International Classification:
H05G 1/32
H05G 1/34
H05G 1/46
US Classification:
378115, 378110, 378112, 378113
Abstract:
A method for controlling focal spot size changes of an x-ray source in an imaging system includes measuring focal spot sizes as a function of a plurality of x-ray source operating parameters, determining a calibration table or transfer function utilizing the measured focal spot sizes as a function of the plurality of x-ray tube operating parameters, and utilizing the calibration table or transfer function to control focal spot size variations during operation of the imaging system.

Reduced Focal Spot Motion In A Ct X-Ray Tube

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US Patent:
7450690, Nov 11, 2008
Filed:
Jul 8, 2005
Appl. No.:
11/160796
Inventors:
Wayne Frederick Block - Sussex WI, US
Edward Emaci - Brookfield WI, US
Sergio Lemaitre - Whitefish Bay WI, US
Ron Kent Hockersmith - Waukesha WI, US
Assignee:
General Electric Company - Schenectady NY
International Classification:
H01J 35/06
H01J 35/30
H01J 35/14
H01J 17/04
H01J 17/16
US Classification:
378136, 378137, 378138, 313631, 313634
Abstract:
An x-ray tube assembly is provided comprising a tube casing assembly including a plurality of vertical mount posts. An insulator plate is mounted to the plurality of vertical mount posts such that the insulator plate can translate vertically on the posts. A cathode assembly is mounted to the insulator plate and generates both an eccentric moment and a vertical expansion in response to a cathode power load. A semi-compressible element is positioned between at least one of the vertical mount posts and the insulator plate. The semi-compressible element becomes incompressible at a cathode power threshold such that the vertical expansion is translated into a correction moment countering the eccentric moment.

System And Method For Generating X-Rays

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US Patent:
7558374, Jul 7, 2009
Filed:
Mar 12, 2007
Appl. No.:
11/685036
Inventors:
Sergio Lemaitre - Shorewood WI, US
Assignee:
General Electric Co. - Schenectady NY
International Classification:
H01J 35/02
US Classification:
378121, 378 10, 378124, 378143
Abstract:
A system and method for generating X-rays comprising a waveguide having a cavity extending therethrough, a first sidewall, and a second sidewall opposite the first sidewall, the second sidewall having an opening extending therethrough forming or including a target therein. An electron emitter coupled to an inner surface of the first sidewall for emitting electrons into the cavity, microwaves coupled into the cavity generating an electric field for accelerating the electrons through the cavity and toward the target in the opening of the second sidewall for generating X-rays.

High Voltage Stable Cathode For X-Ray Tube

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US Patent:
7576481, Aug 18, 2009
Filed:
Jun 30, 2005
Appl. No.:
11/160623
Inventors:
Sergio Lemaitre - Whitefish Bay WI, US
Assignee:
General Electric Co. - Schenectady NY
International Classification:
H01J 19/42
US Classification:
313356, 313292, 313352, 313446, 313353, 313331, 378136, 378137, 378138, 378113, 378178
Abstract:
A method of producing a cathode for use in an x-ray tube assembly is provided including machining an emission aperture into a cup emission surface portion of a cup structure. The cup structure is comprised of a cup base portion opposite the cup emissions surface portion. Electro-discharge machining is used to form an electro-discharge machining slot into the cup structure to provide access to the interior of the cup structure. Electro-discharge machining is used to form a transverse coil chamber within the interior by way of the electro-discharge machining slot such that the transverse coil chamber is formed between the cup base portion and the cup emissions surface portion while retaining an essentially contiguous emissions surface perimeter surrounding the emission aperture.
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Sergio A Lemaitre from Milwaukee, WI, age ~64 Get Report