# US 11,298,001 B2 · Calibration tool for rotating endoscope

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- Number: US 11,298,001 B2
- Document ID: US11298001B2
- Status: Granted
- Kind: B2
- Application number: 16/362,351
- Filed: 2019-03-22
- Published: 2019-10-03
- Granted: 2022-04-12
- Earliest claimed: 2018-03-29
- Assignees: Canon U.S.A., Inc.
- Applicants: Canon USA Inc.
- Inventors: Anderson Thi Mach; Tzu-Yu Wu; Jacob Schieffelin Brauer
- Web page: https://patentgrep.com/patent/US11298001B2

## CPC

- A61B 1/00057: {provided with means for testing or calibration}
- A61B 1/00096: {Optical elements}
- A61B 1/00172: {with means for scanning}
- A61B 1/0638: {providing two or more wavelengths}
- G02B 23/24: Instruments {or systems} for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B 23/2476: {Non-optical details, e.g. housings, mountings, supports}
- G06T 7/80: Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
- A61B 1/00137: {End pieces at either end of the endoscope, e.g. caps, seals or forceps plugs}
- A61B 1/0014: {Fastening element for attaching accessories to the outside of an endoscope, e.g. clips, clamps or bands}
- G06T 2207/10024: Color image
- G06T 2207/10068: Endoscopic image
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

Apparatus and methods for correcting distortion of a spectrally encoded endoscopy (“SEE”), more specifically, the subject disclosure provides a calibration tool calibrating a rotating spectrally encoded endoscope, which may be reused to recalibrate the endoscope throughout the lifecycle, and which may further act to protect the endoscope during packaging, shipping and handling.

## Claims

### Claim 1

A method for calibrating a rotating SEE, the method comprising:
providing a calibration apparatus comprising:
a body configured to encompass at least a portion of a SEE;
a bottomed surface affixed to a distal end of the body; and
a calibration chart configured on an inside wall portion of the apparatus,
wherein the apparatus has an open end, opposite the bottomed surface, wherein the open end is configured to receive the at least a portion of the SEE, and the SEE is a rotating SEE,
scanning the calibration chart with a SEE spectral line to obtain an image;
determining a sign of a tangential shift of the spectral line based on a slope of at least one of the radial lines of the first image in a polar coordinate;
computing a magnitude of the tangential shift based on at least one of the radial lines of the first image in either a polar coordinate or a Cartesian coordinate;
determining a sign of a radial shift of the spectral line based on whether the slope has a turning point or not;
computing a magnitude of the radial shift by measuring a location of the turning point if the radial shift is determined to be negative;
scanning the calibration chart with the SEE spectral line to obtain a second image if the radial shift is determined to be positive;
computing the magnitude of the radial shift based on the magnitude of the tangential shift and a radius of the circle; and
applying the tangential shift and the radial shift for a corrected calibration.

### Claim 2 (depends on 1)

The method of claim 1, wherein the calibration apparatus further comprising an attachment element configured to rigidly and removably attach the apparatus to the SEE.

### Claim 3 (depends on 1)

The method of claim 1, wherein the calibration apparatus is configured to further extend onto a sheath of the SEE.

### Claim 4 (depends on 1)

The method of claim 1, wherein the calibration apparatus is configured for repeated attachment and removal from the at least a portion of the SEE.

### Claim 5 (depends on 1)

The method of claim 1, wherein the calibration chart of the calibration apparatus is positioned at a predetermined distance from the SEE.

### Claim 6 (depends on 1)

The method of claim 1, wherein the bottomed surface of the calibration apparatus is configured to be ruptured by the SEE, allowing the SEE to protrude through the bottomed surface of the apparatus.

### Claim 7 (depends on 1)

The method of claim 1, wherein the calibration apparatus further comprising a second calibration chart configured on an inside wall portion of the apparatus.

### Claim 8 (depends on 1)

The method of claim 1, wherein the bottomed surface of the calibration apparatus is configured to be rotatable or pivotable, allowing for rearrangement of the bottomed surface with respect to the SEE.

### Claim 9 (depends on 1)

The method of claim 1, wherein the calibration chart in the body has a diameter larger than a diameter of the SEE.