Automatic calibration systems and methods of use

• US 9,596,993 B2
• Filed: 02/22/2012
• Issued: 03/21/2017
• Est. Priority Date: 07/12/2007
• Status: Active Grant

• Current Assignee: Volcano Corporation (Koninklijke Philips N.V.)
• Original Assignee: Volcano Corporation (Koninklijke Philips N.V.)
• Inventors: Kemp, Nathaniel J., Begin, Elizabeth, Elmaanaoui, Badr
• Primary Examiner(s): Geisel, Kara E
• Assistant Examiner(s): BOLOGNA, DOMINIC JOSEPH
• Application Number:
  US13/402,798
• Publication Number:
  US 20120224751A1
• Time in Patent Office: 1,854 Days
• Field of Search: 356/479, 356/497, 382/128, 382/254, 382/275
• US Class Current: 1/1
• CPC Class Codes: A61B 5/0066 Optical coherence imaging
• CPC Class Codes: A61B 5/0073 by tomography, i.e. reconstruction of 3D images from 2D projections A61B5/0066 takes precedence
• CPC Class Codes: A61B 5/0084 for introduction into the body, e.g. by catheters A61B5/1459 takes precedence
• CPC Class Codes: A61B 5/6852 Catheters
• CPC Class Codes: A61B 5/7257 using Fourier transforms
• CPC Class Codes: G01B 2290/25 Fabry-Perot in interferometer, e.g. etalon, cavity
• CPC Class Codes: G01B 9/02004 using frequency scans
• CPC Class Codes: G01B 9/02057 by using common path configuration, i.e. reference and object path almost entirely overlapping
• CPC Class Codes: G01B 9/02069 Synchronization of light source or manipulator and detector
• CPC Class Codes: G01B 9/02083 characterised by particular signal processing and presentation
• CPC Class Codes: G01B 9/02091 Tomographic interferometers, e.g. based on optical coherence
• CPC Class Codes: G01M 11/31 with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 21/4795 spatially resolved investigating of object in scattering medium in vivo A61B

Abstract

The disclosed automatic calibration systems and methods provide a repeatable way to detect internal catheter reflections and to shift the internal catheter reflections to calibrate an image.

Claims

1. A method for automatic calibration, comprising:

performing an initial calibration of a catheter, based on internal catheter reflections that are stable in depth and consistent in intensity throughout the 360 degree rotation of the catheter, for a calibration position, the calibration including;

averaging an OCT image frame to selectively enhance high intensity features;

comparing a value of the image features to a pre-calibrated value; and

shifting the OCT image based on the comparison;

monitoring the internal catheter reflections of the calibration position;

determining if the calibration position needs updating on an image frame; and

updating the calibration position on a frame-by-frame basis.

2. The method of claim 1, wherein the image frame is an A-scan.

3. The method of claim 1, wherein the image frame includes a set of image frames.