Robert W Pedersen

US Patent:

45357803, Aug 20, 1985

Filed:

Nov 7, 1984

Appl. No.:

6/669136

Inventors:

David Gur - Pittsburgh PA
John M. Herron - Pittsburgh PA
Robert H. Pedersen - Milwaukee WI

Assignee:

General Electric Company - Milwaukee WI

International Classification:

A61B 600

US Classification:

128659

Abstract:

Apparatus for measuring xenon concentration in xenon cerebral blood-flow studies operates under the control of a microprocessor which is used to monitor the patient's breathing cycle and to control a sampling pump in order to assure that only end-tidal gas is sampled. A xenon gas mixture is delivered to a patient by means of a mask assembly. At the end of each exhale cycle, the patient's end-tidal gas is held in a chamber on the exhale side of the mask assembly. At the start of the next inhale cycle, the microprocessor activates the sampling pump which draws end-tidal gas into a thermal conductivity detector. The output of the detector is transmitted through an A/D converter and the resultant value stored in the microprocessor memory along with the time of the sample. At the completion of a CT scan series, the accumulated data in the microprocessor is transferred to the CT-system-housed computer to be used in the reconstruction of cerebral blood-flow images using conventional techniques.

US Patent:

47278862, Mar 1, 1988

Filed:

Mar 27, 1987

Appl. No.:

7/031191

Inventors:

John E. Conrardy - Milwaukee WI
Bruce J. Fiorani - New Berlin WI
Robert H. Pedersen - Milwaukee WI
Mark P. Steinert - New Berlin WI

Assignee:

General Electric Company - Milwaukee WI

International Classification:

A61B 508

US Classification:

128725

Abstract:

Apparatus for detecting and indicating the commencement of inhalation by a patient under test includes a housing through which a gas flow due to the inhalation is directed. A light source and a light receptor positioned adjacent to transparent portions of the housing define a light path between them which transversely intersects the gas flow, the receptor being adapted to provide an output signal in response to incident light from the source. A movably positioned vane mounted inside the housing and normally biased to a position substantially clear of the light path, moves to a position progressively blocking the light path upon commencement of gas flow due to inhalation. Means responsive to a change in the receptor output signal resulting from blockage of the light path provides indication of the flow due to the inhalation commencement.

US Patent:

51776979, Jan 5, 1993

Filed:

Aug 31, 1990

Appl. No.:

7/576340

Inventors:

Paul C. Schanen - Waukesha WI
Robert H. Pedersen - Woodinville WA
Kishore C. Acharya - Brookfield WI

Assignee:

General Electric Company - Milwaukee WI

International Classification:

H03M 106
H03M 110

US Classification:

36457104

Abstract:

An autozeroing apparatus is disclosed for correcting the offset error in a computerized axial tomography (CAT) scanner data acquisition subsystem (DAS). The DAS includes a floating point amplifier for applying discrete amplification factors, or gain range segments, to an analog input before conversion to digital in an A/D converter. A digital autozero circuit is connected to the output of the A/D converter and adds a digital offset value to each A/D converter sample during data acquisition to correct for the net offset errors throughout the DAS. Separate storage latches are included for storing offset values corresponding to each gain range segment, and the offset value used for each sample correction corresponds to the gain range segment used for that sample. During an autozero reference interval, a reference voltage is applied to the DAS and the offset values are updated so as to force the corrected A/D converter output to agree with the reference voltage.

Address:

26345 Dukleth Dr, Wind Lake, WI 53185

VIN:

1FTPW14V47KA46891

Make:

FORD

Model:

F-150

Year:

2007