Steven K Johnson
Land Surveyors in Salt Lake City, UT

6636584, Oct 21, 2003

Dec 17, 2001

10/024035

Steven A. Johnson - Salt Lake City UT
David T. Borup - Salt Lake City UT
James Wiskin - Salt Lake City UT
Michael J. Berggren - Salt Lake City UT

TechniScan, Inc. - Salt Lake City UT

G01N 2300

378901, 378 62, 378 37, 600437

A method for increasing the speed of the parabolic marching method by about a factor of 256. This increase in speed can be used to accomplish a number of important objectives. Firstly, the speed can be used to collect data to form true 3-D images or 3-D assembled from 2-D slices. Speed allows larger images to be made. Secondly, the frequency of operation can be increased to 5 MHz to match the operating frequency of reflection tomography. This allow the improved imaging of speed of sound which in turn is used to correct errors in focusing delays in reflection tomography imaging. This allows reflection tomography to reach or closely approach its theoretical spatial resolution of ½ to ¾ wave lengths. A third benefit of increasing the operating frequency of inverse scattering to 5 MHz is the improved out of topographic plane spatial resolution. This improves the ability to detect small lesions.

2014005, Feb 20, 2014

Aug 15, 2012

13/586663

Tobias Schroeder - Melrose MA, US
Daniel Eduardo Groszmann - Belmont MA, US
John Whidden - Salt Lake City UT, US
Steven Wayne Johnson - Salt Lake City UT, US

A61B 5/05

600424

Electromagnetic tracking systems and methods for correcting hemispherical ambiguity are described. The system may include a single transmitter having three coils arranged in an industry-standard coil arrangement (ISCA). The tracking system may also contain a receiver having three coils arranged in an ISCA configuration, as well as a fourth coil having a different orientation then any of the other three coils of the receiver. The fourth coil may be used to determine the correct solution to the hemispherical ambiguity that can occur when tracking using two three-coil assemblies. Other embodiments are described.

4662222, May 5, 1987

Dec 21, 1984

6/684801

Steven A. Johnson - Salt Lake City UT

G01N 2904

73602

An apparatus and method for reconstructing an acoustic image of an object using a central processing unit programmed to process data derived from acoustic energy that has been transmitted at multiple frequencies and scattered by the object. Electronic signals are propagated at multiple frequencies and transduced into acoustic energy waves which are propagated toward an object. Transducer receivers detect the acoustic energy waves after they have been scattered by the object and the detected acoustic energy waves are then electronically processed and input into a high-speed digital computer which may comprise a central processing unit and/or a central processing unit in combination with an array processor. Data is also prepared and input to the computer representing the incident field and the computer then reconstructs a high-quality image of the scanned object so as to produce an image having high spacial resolution and including actual internal viscous and elastic properties of the object through the use of new inverse scattering techniques used in the data processing steps.

7841982, Nov 30, 2010

Sep 9, 2005

11/223084

Steven A. Johnson - Salt Lake City UT, US
David T. Borup - Salt Lake City UT, US
James Wiskin - Salt Lake City UT, US
Michael J. Berggren - Salt Lake City UT, US

Techniscan, Inc. - Salt Lake City UT

A61B 5/00, G01N 23/00

600437, 600442, 600443, 600448, 181101

A transmission wave field imaging method, comprising the transmission of an incident wave field into an object, the incident wave field propagating into the object and, at least, partially scattering. Also includes the measuring of a wave field transmitted, at least in part, through an object to obtain a measured wave field, the measured wave field based, in part, on the incident wave field and the object. Additionally, the processing of the measured wave field utilizing a parabolic approximation reconstruction algorithm to generate an image data set representing at least one image of the object.

7684846, Mar 23, 2010

Sep 9, 2005

11/222541

Steven A. Johnson - Salt Lake City UT, US
David T. Borup - Salt Lake City UT, US
James Wiskin - Salt Lake City UT, US
Michael J. Berggren - Salt Lake City UT, US

Techniscan, Inc - Salt Lake City UT

A61B 5/00, G01N 23/00

600407, 181101

A transmission wave field imaging method, comprising the transmission of an incident wave field into an object, the incident wave field propagating into the object and, at least, partially scattering. Also includes the measuring of a wave field transmitted, at least in part, through an object to obtain a measured wave field, the measured wave field based, in part, on the incident wave field and the object. Additionally, the processing of the measured wave field utilizing a recursive reconstruction algorithm to generate an image data set representing at least one image of the object.

5339282, Aug 16, 1994

Oct 2, 1992

7/956036

Paul K. Kuhn - Midvale UT
Steven A. Johnson - Salt Lake City UT

University of Utah Research Foundation - Salt Lake City UT

G03B 4206

367 7

An annular array scanner utilizes a synthetic focusing approach to improve imaging results. Image sharpening methods include corrections for the speed of sound of the image, phased array misregistration and separate view misalignment as well as inverse filtering for the scanning system point spread function.