David W Petersen

US Patent:

6599245, Jul 29, 2003

Filed:

Jun 27, 2000

Appl. No.:

09/604568

Inventors:

Qinglin Ma - Bothell WA
John C. Lazenby - Fall City WA
Lin Xin Yao - Bellevue WA
Bruce A. McDermott - Bellevue WA
David A. Petersen - Fall City WA

Assignee:

Siemens Medical Solutions USA, Inc. - Iselin NJ

International Classification:

A61B 800

US Classification:

600437, 600454

Abstract:

A system for controlling the point spread function of an ultrasound signal transmitted into a patient. In accordance with one embodiment of the invention, only a selected number of the transducer elements transmit a transmit pulse. The elements which do not transmit the pulse are selected in accordance with an apodization probability density function. In accordance with another aspect of the present invention, each transducer element transmits a variable portion of a transmit pulse in order to control the acoustic power of the signal transmitted from each element.

US Patent:

6659547, Dec 9, 2003

Filed:

Jul 27, 2001

Appl. No.:

09/917528

Inventors:

David R. Petersen - Edmonds WA 98020

International Classification:

B62J 100

US Classification:

2972151, 29721512, 297410, 297353, 2803044

Abstract:

An adjustable back rest for a motorcycle comprising a carrier assembly connected to the frame of the motorcycle, a back plate assembly pivotally attached to the carrier assembly and positionable at an inclination angle, and an extensible slide connected between the carrier assembly and the back plate assembly that extends or retracts to thereby adjust the inclination angle of the back plate assembly and then is secured in place to position the back plate assembly as desired. A pillion rest is attached to the back plate assembly and is angularly adjustable by positioning a plurality of bar links connected between the pillion rest and the back plate assembly. The carrier assembly can be positioned and secured to the motorcycle frame to provide back rest support for the driver, or it may be positioned and secured to a cargo carrier attached to the frame to provide back rest support for the passenger.

US Patent:

6780154, Aug 24, 2004

Filed:

Jan 14, 2003

Appl. No.:

10/341816

Inventors:

Robert P. Hunt - Maple Valley WA
John C. Lazenby - Fall City WA
Robert N. Phelps - Sammamish WA
David A. Petersen - Fall City WA
Stephen B. Hooper - Seattle WA
Heike Seck - Issaquah WA
Jerry D. Hopple - Woodinville WA
Bhavani Duggirala - Bellevue WA

Assignee:

Siemens Medical Solutions USA, Inc. - Malvern PA

International Classification:

A61B 806

US Classification:

600446

Abstract:

A segmented ultrasound system is provided. Ultrasound data, such as image data in a video format, is wirelessly transmitted to a multi-use display device from a handheld ultrasound device. Any of various multi-use display devices may be used, such as personal digital assistants (PDA), tablet computers, lap top computers, or personal computers.

US Patent:

6806623, Oct 19, 2004

Filed:

Jun 27, 2002

Appl. No.:

10/185404

Inventors:

David A. Petersen - Fall City WA
John C. Lazenby - Fall City WA
Robert P. Hunt - Sammamish WA
Robert N. Phelps - Sammamish WA

Assignee:

Siemens Medical Solutions USA, Inc. - Malvern PA

International Classification:

H01L 4108

US Classification:

310334, 310317, 310319, 660407, 660437

Abstract:

Methods and systems for isolating transmit and receive circuitry at an ultrasound transducer element are provided. Separate electrodes or electrodes on opposite sides of a transducer element are connected to the separate transmit and receive paths or channels. Instead of high voltage transmit and receive switching, the transducer element isolates the transmit channel from the receive channel. The transmit channel includes circuitry for limiting the voltage at one electrode during receive processing, such as a switch operable to connect the electrode to ground. The receive channel includes circuitry for limiting the voltage at an electrode during transmit processing, such as a diode clamp preventing voltage swings greater than diode voltage at the electrode. Limiting the voltage provides virtual grounding or a direct current for either of the transmit or receive operation. Using a transmit channel discussed above or other transmit channels, a unipolar pulse may be generated starting at one voltage and ending at a different voltage.

US Patent:

6875178, Apr 5, 2005

Filed:

Jun 27, 2002

Appl. No.:

10/184461

Inventors:

Robert N. Phelps - Sammamish WA, US
David A. Petersen - Fall City WA, US
John C. Lazenby - Fall City WA, US
Robert P. Hunt - Sammamish WA, US

Assignee:

Siemens Medical Solutions USA, Inc. - Malvern PA

International Classification:

A61B008/00

US Classification:

600447

Abstract:

Methods and systems for receiving different types of signal formats from different ultrasound transducers are provided. A base unit of an ultrasound system includes a connector and receiver circuit for connecting with one of multiple different types of transducers. For example, a conventional transducer providing analog information associated with a single element on one receive channel is connected with the connector and receiver circuit. Alternatively, a transducer outputting time division multiplex or other multiplex information representing multiple transducer elements is connected with the connector and receiver circuit. The receiver circuit processes the received information differently depending on the data format. For example, the preamplifier impedance or gain is different for single element signals versus time division multiplex signals. As another example, a low pass filter bandwidth is larger for time division multiplex signals than for signals representing a single element.

US Patent:

6891311, May 10, 2005

Filed:

Sep 18, 2002

Appl. No.:

10/247379

Inventors:

Robert Phelps - Sammamish WA, US
David A. Petersen - Fall City WA, US

Assignee:

Siemens Medical Solutions USA, INC - Malvern PA

International Classification:

H01L041/08

US Classification:

310317, 310319, 310334

Abstract:

A transmit pulser includes an H-bridge of four transistors. First and second transistors of the H-bridge connect with a first electrode of a transducer element, and third and fourth transistors of the H-bridge connect with a second electrode of the transducer element. A differential receive amplifier connects with the first and third transistors. First and second diode clamps connect with the first and third transistors, respectively, and the inputs to the differential receive amplifier. The second and fourth transistors connect to a same power or voltage source, imposing a same voltage in either a forward or a reverse direction. By using matched transistor pairs (e. g. first and third matched pair and second and fourth matched pair), symmetrical transmit waveforms are generated. Symmetrical transmit waveforms allow for using phase inversion or phase differences between transmit waveforms for imaging, such as for harmonic imaging of tissue. The spectral content of symmetrical waveforms is narrower or includes less harmonic information.

US Patent:

6939300, Sep 6, 2005

Filed:

Feb 19, 2002

Appl. No.:

10/078690

Inventors:

David A. Petersen - Fall City WA, US
Robert N. Phelps - Issaquah WA, US

Assignee:

Siemens Medical Solutions USA, Inc. - Malvern PA

International Classification:

A61B008/00

US Classification:

600437

Abstract:

Transmitters for generating multilevel transmit waveforms for medical diagnostic ultrasound are provided. Voltages from a plurality of sources are superposed or summed. Switches control the amplitude and polarity of the summed voltages so that a transmit waveform having four or more, such as nine, voltage levels is provided. A simple switching pulser without a power amplifier combines voltages applied to two or more flux paths in a third flux path. Superposition of magnetic flux in the third flux path provides for an output voltage responsive to the sum and difference of two different voltages. Alternatively or additionally, the secondary windings of multiple transformers are connected in series with a transducer element. By providing different input voltages to each of the transformers, the multilevel transmit waveform is generated.

US Patent:

7304415, Dec 4, 2007

Filed:

Aug 13, 2004

Appl. No.:

10/917579

Inventors:

David A. Petersen - Fall City WA, US
John C. Lazenby - Fall City WA, US

Assignee:

Siemens Medical Solutions USA. Inc. - Malvern PA

International Classification:

H01L 41/00

US Classification:

310334, 31031601, 310317, 310319

Abstract:

Interconnection from a multidimensional transducer array to electronics is provided. Circuit board modules are used in combination with z-axis interconnections of a transducer array to provide active electronics within a volume adjacent to the multidimensional transducer array. By using multiple modules to connect to different regions of z-axis interconnects, conductor paths from the transducer to the electronics are more likely of similar lengths. By including a thin or thinner region on each of the modules for active electronics, a greater volume of the space adjacent to the transducer array may include active electronics. Thicker regions route conductors from the 2D array regions, and thinner regions provide space for active electronics. Using multiple modules with z-axis interconnects may reduce cross-talk and space requirements for implementing some or all of the transmit and/or receive beamformation adjacent to the multidimensional transducer array. Additionally or alternatively, other electronics than beamformation components are provided on the modules.