The patent's assignee is Canon Kabushiki Kaisha.
News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to an optical tomographic imaging apparatus and a method for controlling the same. For example, the present invention relates to an optical tomographic imaging apparatus for use in ophthalmic practice and a method for controlling the same.
"Optical image measurement techniques for forming an image of the surface and/or inside of an object to be measured by using light are attracting attention in recent years. Unlike conventional X-ray computed tomography (CT), the optical image measurement techniques are not invasive to the human body. Applications of the optical image measurement techniques are expected to be developed especially in the medical field. Significant progress has been made in the ophthalmological field in particular.
"Among typical techniques for optical image measurement is a method called optical coherence tomography (OCT). This method uses an interferometer, which enables high-resolution high-sensitivity measurement. Using wideband weak light as illumination light provides an advantage of high safety to a subject.
"An optical tomographic imaging apparatus based on OCT (hereinafter, referred to as an OCT apparatus) using optical interference can obtain a tomographic image of a sample with high resolution. In particular, the OCT apparatus relates to an anterior eye optical tomographic imaging apparatus for forming an image of an anterior eye of a subject's eye.
"The OCT apparatus can irradiate a sample with low coherent light serving as measurement light, and measure backscattered light from the sample with high sensitivity by using an interference system or an interference optical system. The OCT apparatus can scan the sample with the measurement light to obtain a high-resolution tomographic image. A tomographic image of a cornea region of the anterior eye of a subject's eye can thus be obtained and used for ophthalmic diagnosis.
"Japanese Patent Application Laid-Open No. 2011-147612 discusses an optical tomographic imaging apparatus that can capture both a tomographic image of an anterior eye and a tomographic image of a fundus. According to whether an imaging mode is an anterior eye imaging mode or a fundus imaging mode, the optical tomographic imaging apparatus moves a reference mirror included in its interference optical system to a position corresponding to the imaging mode."
As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventors' summary information for this patent application: "According to an aspect of the present invention, an optical tomographic imaging apparatus configured to obtain a tomographic image of an object based on light into which return light from the object irradiated with measurement light and reference light corresponding to the measurement light are combined includes a measurement light optical path length changing unit configured to change an optical path length of the measurement light, an instruction unit configured to issue an instruction on a size of an imaging range of the tomographic image, and a control unit configured to control the measurement light optical path length changing unit to perform alignment in a depth direction with respect to the object after the instruction by the instruction unit, and change the optical path length of the measurement light by a distance corresponding to a change of the size on which the instruction is issued.
"Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 is a diagram illustrating an entire optical tomographic imaging apparatus according to a first exemplary embodiment.
"FIG. 2 is a diagram illustrating a configuration of a measurement optical system according to the first exemplary embodiment.
"FIG. 3 is an explanatory diagram illustrating a state where an anterior eye of a subject's eye is scanned in an x direction according to the first exemplary embodiment.
"FIGS. 4A, 4B, and 4C are explanatory diagrams illustrating scan ranges in an imaging position of an anterior eye according to the first exemplary embodiment and images obtained according to the scan ranges.
"FIG. 5 is a diagram illustrating an example of a measurement operation screen according to the first exemplary embodiment.
"FIG. 6 is a diagram illustrating another example of the measurement operation screen according to the first exemplary embodiment.
"FIG. 7 is a flowchart illustrating a measurement flow according to the first exemplary embodiment.
"FIGS. 8A, 8B, 8C, 8D, 8E, and 8F are diagrams illustrating display examples of tomographic images of an anterior eye according to the first exemplary embodiment and display examples of the images corrected.
"FIG. 9 is a diagram illustrating an entire optical tomographic imaging apparatus according to a second exemplary embodiment.
"FIGS. 10A and 10B are diagrams illustrating a polygonal mirror according to a fourth exemplary embodiment.
"FIG. 11 is a diagram illustrating parameters according to a fifth exemplary embodiment."
For additional information on this patent application, see: Oyaizu, Keisuke;
Keywords for this news article include: Canon Kabushiki Kaisha, Optical Coherence Tomography.
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