# US 2013/0093997 A1 · Optical coherence tomography and method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0093997 A1 - Document ID: US20130093997A1 - Status: Published application - Kind: A1 - Application number: 13/805,805 - Filed: 2011-06-22 - Published: 2013-04-18 - Earliest claimed: 2010-06-30 - Assignees: Canon Kabushiki Kaisha - Inventors: Norihiko Utsunomiya; Junko Nakajima - Web page: https://patentgrep.com/patent/US20130093997A1 ## CPC - A61B 3/12: for looking at the eye fundus, e.g. ophthalmoscopes (A61B3/13 takes precedence) - A61B 3/102: {for optical coherence tomography [OCT]} - A61B 3/14: Arrangements specially adapted for eye photography - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract The image sensing apparatus comprises a first scan unit for scanning light from an OCT light source and light from an SLO light source in a first direction of a test object, and a second scan unit for scanning the light from the OCT light source in a second direction different from the first direction of the test object. The image sensing apparatus acquires tomographic images of the test object along the first direction when the first scan unit scans the light from the OCT light source, and acquires cross-over images of the test object corresponding to the tomographic images when the first scan unit scans the light from the SLO light source. ## Claims ### Claim 1 An image sensing apparatus comprising: first scan means for scanning light from an OCT light source and light from an SLO light source in a first direction of an eye; second scan means for scanning the light from the OCT light source in a second direction different from the first direction of the eye; first acquisition means for acquiring tomographic images of the eye along the first direction when the first scan means scans the light from the OCT light source; and second acquisition means for acquiring multiple fundus images of the eye corresponding to the tomographic images when the first scan means scans the light from the SLO light source, wherein the first scan means includes a common scan mechanism for the light from the SLO light source and the light from the OCT light source. ### Claim 2 (depends on 1) The apparatus according to claim 1, further comprising: light path split means, which is arranged on a light path guiding the light from the second scan means to the first scan means; and an optical element which forms a line beam from the light from the SLO light source, wherein the light path split means guides the line beam to the first scan means. ### Claim 3 (canceled) ### Claim 4 (depends on 1) The apparatus according to claim 1, further comprising: detection means for extracting feature points from each of the multiple fundus images acquired by the second acquisition means and for detecting variation of the feature points in the fundus images; and generation means for generating an image for observation using the multiple tomographic images and the variation of the feature points detected by the detection means. ### Claim 5 (depends on 4) The apparatus according to claim 4, wherein the first acquisition means acquires multiple tomographic images usable for generating a three-dimensional tomographic image by scanning the light from the OCT light source in the first direction by the first scan means and repeating the scan while shifting scan position to the second direction by the second scan means, and the generation means further comprising, means for generating a three-dimensional tomographic image as the image for observation by correcting the position of the tomographic images in the three-dimensional tomographic image based on the variation. ### Claim 6 (depends on 5) The apparatus according to claim 5, wherein the light from the SLO is a line beam extended to the second direction, and the fundus image is acquired by scanning the line beam to the first direction, the scan of the light from the OCT light source in the first acquisition means to the first direction and the scan of the line beam to the first direction are simultaneously performed. ### Claim 7 (depends on 5) The apparatus according to claim 5, wherein the generation means: calculates correction amount to correct variation of the position of feature points for each fundus images acquired by the second acquisition means; and generates the three-dimensional tomographic image by correcting the tomographic images acquired during the period corresponding to each fundus images using the calculated correction amount for each fundus images. ### Claim 8 (depends on 7) The apparatus according to claim 7, wherein the generation means calculates the correction amount for magnification, rotation and translation using a linear mapping equation. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the linear mapping equation is configured to calculate the correction amount for the rotation and magnification using their components separated into the first direction and the second direction. ### Claim 10 (depends on 7) The apparatus according to claim 7, wherein the generation means does not use the tomographic image for the three-dimensional tomographic image, which has been acquired during the period corresponding to the fundus image and has the variation amount or the correction amount exceeding a certain threshold value. ### Claim 11 (depends on 1) The apparatus according to claim 1, wherein the second acquisition means acquires fundus images in sync with the acquisition of tomographic images in the first acquisition means so as to acquire one fundus image every N tomographic images. ### Claim 12 (depends on 4) The apparatus according to claim 4, wherein the first acquisition means obtains multiple tomographic images by repeating the scan of the light from the OCT light source to the first direction at the same position, and the generation means generates the image for observation by averaging the multiple tomographic images, and excludes the tomographic image from the object of averaging, which has been acquired during the period corresponding to the feature point and has the large variation. ### Claim 13 A method of controlling an image sensing apparatus, comprising: a first scanning step of scanning light from an OCT light source and light from an SLO light source in a first direction of an eye using first scanning means; a second scanning step of scanning the light from the OCT light source in a second direction different from the first direction of the eye using second scanning means; a first acquiring step of acquiring tomographic images of the eye along the first direction when scanning the light from the OCT light source in the first scanning step; and a second acquiring step of acquiring multiple fundus images of the eye corresponding to the tomographic images when scanning the light from the SLO light source in the first scanning step, wherein, in the first scan step, the light from the SLO light source and the light from the OCT light source are scanned using a common scan mechanism. ### Claim 14 (depends on 13) A non-transitory computer readable medium in which a computer program that causes a computer to execute the method according to claim 13 is stored. ### Claim 15 (depends on 2) The apparatus according to claim 2, further comprising a line sensor which detects a light returning from the eye on which the line beam is illuminated.