Robert J Graf

US Patent:

20130176560, Jul 11, 2013

Filed:

Oct 22, 2012

Appl. No.:

13/657517

Inventors:

Duke University - Durham NC, US
Robert N. Graf - Durham NC, US
Francisco E. Robles - Durham NC, US

Assignee:

Duke University - Durham NC

International Classification:

G01J 3/45

US Classification:

356300, 356342

Abstract:

Current apparatuses and methods for analysis of spectroscopic optical coherence tomography (SOCT) signals suffer from an inherent tradeoff between time (depth) and frequency (wavelength) resolution. In one non-limiting embodiment, multiple or dual window (DW) apparatuses and methods for reconstructing time-frequency distributions (TFDs) that applies two windows that independently determine the optical and temporal resolution is provided. For example, optical resolution may relate to scattering information about a sample, and temporal resolution may be related to absorption or depth related information. The effectiveness of the apparatuses and methods is demonstrated in simulations and in processing of measured OCT signals that contain fields which vary in time and frequency. The DW technique may yield TFDs that maintain high spectral and temporal resolution and are free from the artifacts and limitations commonly observed with other processing methods.

US Patent:

D2848554, Jul 29, 1986

Filed:

Mar 19, 1984

Appl. No.:

6/590788

Inventors:

Robert Graf - Wilton CT

Assignee:

PKS/Communications, Incorporated - Milford CT

US Classification:

D14 53

US Patent:

20160290867, Oct 6, 2016

Filed:

Feb 22, 2016

Appl. No.:

15/050368

Inventors:

- Durham NC, US
Robert N. Graf - Durham NC, US
Francisco E. Robles - Durham NC, US

International Classification:

G01J 3/453
G01B 9/02

Abstract:

Current apparatuses and methods for analysis of spectroscopic optical coherence tomography (SOCT) signals suffer from an inherent tradeoff between time (depth) and frequency (wavelength) resolution. In one non-limiting embodiment, multiple or dual window (DW) apparatuses and methods for reconstructing time-frequency distributions (TFDs) that applies two windows that independently determine the optical and temporal resolution is provided. For example, optical resolution is provided. For example, optical resolution may relate to scattering information about a sample, and temporal resolution may be related to absorption or depth related information. The effectiveness of the apparatuses and methods is demonstrated in simulations and in processing of measured OCT signals that contain fields which vary in time and frequency. The DW technique may yield TFDs that maintain high spectral and temporal resolution and are free from the artifacts and limitations commonly observed with other processing methods.