1. Articles from Ou Tan

    49-56 of 56 « 1 2 3
    1. Investigation of retinal blood flow in normal and glaucoma subjects by doppler fourier-domain optical coherence tomography

      We present in vivo human retinal blood flow investigation using Fourier domain optical coherence tomography. A pilot study was performed to evaluate the total retinal blood flow in glaucoma patients and normal subjects. For normal people, the measured total retinal flow was between 40.8 and 52.9 [mu ... [Proc. SPIE 7168, 71680B (2009)] published Thu Feb 19, 2009.

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    2. Measurement of total blood flow in the normal human retina using Doppler Fourier-domain optical coherence tomography

      Aim: To measure total retinal blood flow in normal human eyes using Doppler Fourier-domain optical coherence tomography (FD-OCT). Methods: 10 normal people aged 35 to 69 years were measured for the right eye using Doppler FD-OCT. Double circular scans around the optic nerve heads were used. Four pairs of circular scans that transected all retinal branch vessels were completed in 2 seconds. Total retinal blood flow was obtained by summing the flows in the branch veins. Measurements from the eight scans were averaged. Veins with diameters > 33 µm were taken into account. Results: Total retinal blood flow could be measured ...

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    3. Pattern Analysis Of Retinal Maps For Diagnosis Of Optic Nerve Diseases By Optical Coherence Tomography (Wo 2008/157406)

      Pattern Analysis Of Retinal Maps For Diagnosis Of Optic Nerve Diseases By Optical Coherence Tomography (Wo 2008/157406)
      Methods for analyzing retinal tomography maps to detect patterns of optic nerve diseases such as glaucoma, optic neuritis, anterior ischemic optic neuropathy are disclosed in this invention. The areas of mapping include the macula centered on the fovea, and the region centered on the optic nerve head. The retinal layers that are analyzed include the nerve fiber, ganglion cell, inner plexiform and inner nuclear layers and their combinations. The overall retinal thickness can also be analyzed. Pattern analysis are applied to the maps to create single parameter for diagnosis and progression analysis of glaucoma and optic neuropathy.
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    4. Retinal blood flow measurement by circumpapillary Fourier domain Doppler optical coherence tomography

      We present in vivo human total retinal blood flow measurements using Doppler Fourier domain optical coherence tomography (OCT). The scan pattern consisted of two concentric circles around the optic nerve head, transecting all retinal branch arteries and veins. The relative positions of each blood vessel in the two OCT conic cross sections were measured and used to determine the angle between the OCT beam and the vessel. The measured angle and the Doppler shift profile were used to compute blood flow in the blood vessel. The flows in the branch veins was summed to give the total retinal blood flow ...

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    5. A Pilot Study of Fourier-Domain Optical Coherence Tomography of Retinal Dystrophy Patients

      Purpose To characterize the macular anatomy of retinal dystrophy eyes using high-speed, high-resolution, Fourier-domain optical coherence tomography (FD-OCT). Design Case-control study. Methods Retinal dystrophy patients and normal age- and gender-matched controls underwent FD-OCT imaging using the RTVue (Optovue Inc, Fremont, California, USA). Vertical and horizontal 8-mm scans of 1024 lines/cross-section were obtained. Based on boundaries manually drawn on computer displays of OCT cross-sections, the thicknesses of the retina, inner retinal layer (IRL), and outer retinal layer (ORL) were averaged over both 5-mm (macular) and 1.5-mm (foveal) regions centered at the fovea. The IRL was the sum of nerve ...
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    6. Method and apparatus for measuring a retinal sublayer characteristic

      Methods and systems are provided for measuring a retinal sublayer characteristic of an eye. A plurality of axial scans are performed over an area of the retina of the eye. Reflections are measured during the axial scans to determine a plurality of sets of reflection intensity values. A given set of reflection intensity values is associated with one of the plurality of axial scans. A progressive refinement boundary detection algorithm is performed using the plurality of sets of reflection intensity values to determine at least one boundary location associated with the retinal sublayer for each of the plurality of sets ...
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    7. Glaucoma diagnosis by mapping macula with Fourier domain optical coherence tomography

      Ou Tan, Ake Lu, Vik Chopra et al. A new image segmentation method was developed to detect macular retinal sub-layers boundary on newly-developed Fourier-Domain Optical Coherence Tomography (FD-OCT) with macular grid scan pattern. The segmentation results were used to create thickness map of macular ganglion cell complex (GCC), which ... [Proc. SPIE Int. Soc. Opt. Eng. 6915, 69153L (2008)] published Mon Mar 17, 2008.
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    8. In vivo retinal blood flow measurement by Fourier domain Doppler optical coherence tomography

      The measurement of ocular blood flow is important in studying the pathophysiology and treatment of several leading causes of blindness. We present a method for in vivo human retinal flow measurement using Fourier domain optical coherence tomography. A double circular scanning pattern was used to sca ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68470G (2008)] published Mon Feb 18, 2008.

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    49-56 of 56 « 1 2 3
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  2. Topics in the News

    1. (56 articles) David Huang
    2. (56 articles) Ou Tan
    3. (52 articles) Center for Ophthalmic Optics and Lasers
    4. (41 articles) Oregon Health & Science University
    5. (31 articles) University of Southern California
    6. (12 articles) Rohit Varma
    7. (11 articles) Xinbo Zhang
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