Tomographic image processing device and program

Patent metadata

Field	Value
Publication number	US-12458221-B2
Application number	US-202318149375-A
Country	US
Kind code	B2
Filing date	Jan 3, 2023
Priority date	Jan 31, 2022
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A tomographic image processing device includes a tomographic image acquisition unit that acquires a plurality of tomographic images including an anterior chamber angle, the tomographic images being obtained by radial scan with a substantially conical vertex as a center; an analysis unit that obtains an analysis value related to the anterior chamber angle from each of the plurality of tomographic images; and a display processing unit that causes a display unit to display information regarding each analysis value obtained from each of the plurality of tomographic images in association with a rotation angle in the radial scan at which the anterior chamber angle corresponding to the analysis value is obtained.

First claim

What is claimed is:

1 . A tomographic image processing device comprising:
a recording medium that stores a program; and a processor, wherein the processor is configured to function as a tomographic image acquisition unit, an analysis unit, a display processing unit, and a front image acquisition unit by executing the program stored in the recording medium, the tomographic image acquisition unit is configured to acquire a plurality of tomographic images including an anterior chamber angle, the plurality of tomographic images being obtained by radial scan with a position as a center that substantially matches a corneal vertex; the analysis unit is configured to specify a position of a scleral spur from each tomographic image of the plurality of tomographic images, and obtain, as an analysis value, at least one of a distance, an angle, and an area between a cornea and an iris at a predetermined position, the position being based on the specified position of the scleral spur set in the tomographic image; the analysis unit is configured to classify the anterior chamber angle obtained at each rotation angle into a plurality of anterior chamber angle levels that are set according to a size of the anterior chamber angle, based on a preset threshold value of the analysis value and the analysis value; the front image acquisition unit is configured to acquire a photographed front image of an anterior eye segment; and the display processing unit is configured to cause a display to display the front image, and cause a mark in a color indicating an anterior chamber angle level to be superimposed and displayed at a position corresponding to a position of the scleral spur set in the tomographic image at a position in the front image corresponding to each rotation angle at which the anterior chamber angle is obtained and in a radial direction extending from the center.

2 . The tomographic image processing device according to claim 1 , wherein
the threshold value is determined based on the analysis values obtained in a plurality of eyes at an open angle.

3 . The tomographic image processing device according to claim 1 , further comprising:
a reception unit configured to receive a correction instruction of the position of the scleral spur in the tomographic image; wherein the processor functions as the reception unit by executing the program, the analysis unit is configured to obtain the distance based on the position of the scleral spur after correction according to the correction instruction, and specifies the anterior chamber angle level corresponding to the obtained distance; and the display processing unit is configured to cause the mark in a color indicating the anterior chamber angle level specified based on the position of the scleral spur after correction to be displayed at the position of the scleral spur after the correction.

4 . The tomographic image processing device according to claim 1 , wherein
the display processing unit is configured to display the tomographic image in which the distance corresponding to the mark is obtained in a case where the mark is selected.

5 . The tomographic image processing device according to claim 1 , wherein
the threshold value is determined for every rotation angle.

6 . The tomographic image processing device according to claim 1 , wherein
at least two values of the threshold value are defined according to brightness of a surrounding environment; and the analysis unit is configured to classify the anterior chamber angle into a plurality of the anterior chamber angle levels using the set threshold value of the at least two values.

7 . The tomographic image processing device according to claim 1 , wherein
the analysis unit is configured to obtain a comprehensive evaluation value that is a ratio at which the specific anterior chamber angle level is obtained among the anterior chamber angles corresponding to all the measurement positions and the display processing unit is configured to display the comprehensive evaluation value.

8 . The tomographic image processing device according to claim 1 , wherein
the display processing unit is configured to display a circular chart corresponding to an anterior eye segment, and is configured to display the analysis value and a preset threshold value of the analysis value along an axis indicating the distance set in a radial direction at a position in a circumferential direction of the chart corresponding to each rotation angle at which the distance is obtained.

9 . The tomographic image processing device according to claim 8 , wherein
the display processing unit is configured to display a range corresponding to the rotation angle at which the anterior chamber angle level is obtained in the chart with a color indicating the anterior chamber angle level.

10 . A non-transitory computer-readable medium storing a program for causing a computer to execute following steps:
a tomographic image acquisition step of acquiring a plurality of tomographic images including an anterior chamber angle, the tomographic images being obtained by radial scan with a position as a center that substantially matches a corneal vertex; an analysis step of specifying a position of a scleral spur from each tomographic image of the plurality of tomographic images, obtaining, as an analysis value, at least one of a distance, an angle, and an area between a cornea and an iris at a predetermined position, the position being based on the specified position of the scleral spur set in the tomographic image, and classifying the anterior chamber angle obtained at each rotation angle into a plurality of anterior chamber angle levels that are set according to a size of the anterior chamber angle, based on a preset threshold value of the analysis value and the analysis value; a front image acquisition step acquiring a photographed front image of an anterior eye segment; and a display processing step causing a display to display the front image, and causing a mark in a color indicating the anterior chamber angle level to be superimposed and displayed at a position corresponding to a position of the scleral spur set in the tomographic image at a position in the front image corresponding to each rotation angle at which the anterior chamber angle is obtained and in a radial direction extending from the center.

Assignees

• Tomey Corp

Inventors

• Li Fushi
• Okamoto Keiichiro
• Higashita Risa

Classifications

• A61B3/0041

  characterised by display arrangements · CPC title

• A61B3/117

  for examining the anterior chamber or the anterior chamber angle, e.g. gonioscopes · CPC title

• A61B3/107

  for determining the shape or measuring the curvature of the cornea · CPC title

• A61B3/1005

  for measuring distances inside the eye, e.g. thickness of the cornea (A61B3/11 takes precedence) · CPC title

• A61B3/102 Primary

  for optical coherence tomography [OCT] · CPC title