1. Hideki Koizumi

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    1. Mentioned In 22 Articles

    2. Unmeasurable small size of foveal avascular zone without visual impairment in optical coherence tomography angiography

      Unmeasurable small size of foveal avascular zone without visual impairment in optical coherence tomography angiography
      Purpose To report the clinical characteristics of eyes with an unmeasurable small size of foveal avascular zone (FAZ) in the optical coherence tomography angiographic (OCTA) images. Methods Two-hundred sixty-seven eyes of 255 patients (mean age 60.4 years) without retinal and choroidal disorders to cause any type of visual impairment were examined by optical coherence tomography angiography (OCTA; RTVue XR Avanti, Optovue, Fremont, CA). Cross-sectional images at the fovea (DRI-OCT ...
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    3. Unmeasurable small size of foveal avascular zone without visual impairment in optical coherence tomography angiography

      Unmeasurable small size of foveal avascular zone without visual impairment in optical coherence tomography angiography
      Purpose To report the clinical characteristics of eyes with an unmeasurable small size of foveal avascular zone (FAZ) in the optical coherence tomography angiographic (OCTA) images. Methods Two-hundred sixty-seven eyes of 255 patients (mean age 60.4 years) without retinal and choroidal disorders to cause any type of visual impairment were examined by optical coherence tomography angiography (OCTA; RTVue XR Avanti, Optovue, Fremont, CA). Cross-sectional images at the fovea (DRI-OCT ...
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    4. Enhanced Depth Imaging Spectral-Domain Optical Coherence Tomography

      Enhanced Depth Imaging Spectral-Domain Optical Coherence Tomography
      Purpose To describe a method to obtain images of the choroid using conventional spectral-domain (SD) optical coherence tomography (OCT) and to evaluate choroidal thickness measurements using these images. Design Observational case series. Methods The images were obtained by positioning the SD OCT device close enough to the eye to obtain an inverted representation of the fundus in healthy volunteers who did not have pupillary dilation. Seven sections, each comprised of ...
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    5. Choroidal Blood Flow Visualization In High Myopia Using A Projection Artifact Method In Optical Coherence Tomography Angiography

      Choroidal Blood Flow Visualization In High Myopia Using A Projection Artifact Method In Optical Coherence Tomography Angiography
      Purpose: To visualize choroidal blood flow in larger vessels in highly myopic eyes using a phenomenon of the projection artifact to in the sclera using optical coherence tomography angiography. Methods: The retrospective study included 92 eyes (54 patients) with greater than 8 diopters of myopia. All eyes were examined using optical coherence tomography angiography (RTVue XR Avanti; Optovue Inc, Fremont, CA). The blood flow in choroidal vessels was evaluated by ...
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    6. CHOROIDAL BLOOD VESSELS IN RETINAL PIGMENT EPITHELIAL ATROPHY USING OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY

      CHOROIDAL BLOOD VESSELS IN RETINAL PIGMENT EPITHELIAL ATROPHY USING OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY
      Purpose: To observe choroidal blood vessels in cases sharply demarcated with retinal pigment epithelium (RPE) atrophy at the macular area using en-face optical coherence tomography angiography (OCTA) and standard en-face optical coherence tomography (OCT). Methods: The retrospective study included 12 eyes (8 patients; 5 men, 3 women; average age, 64.3 years) with RPE atrophy seen by ophthalmoscopy. The macular areas with normal and atrophic RPE sections were examined using ...
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    7. Optical coherence tomography angiography and fundus autofluorescence in the eyes with choroideremia

      Optical coherence tomography angiography and fundus autofluorescence in the eyes with choroideremia
      A 65-year-old man with presumed choroideremia with preserved central vision was examined by fundus autofluorescence (FAF) and optical coherence tomography angiography (OCTA). FAF showed an isolated area of hyperautofluorescence that involved the fovea. Although the choroid capillary slab of the OCTA showed the medium and large choroidal vessels inferior to the area of retinal pigment epithelium (RPE) atrophy, the choriocapillaris was visible in a relatively wider area than the hyperautofluorescent ...
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      Mentions: Hideki Koizumi
    8. Detection of retrobulbar blood vessels in optical coherence tomography angiographic images in eyes with pathologic myopia

      Detection of retrobulbar blood vessels in optical coherence tomography angiographic images in eyes with pathologic myopia
      Purpose To report the detection of retrobulbar blood vessel in the optical coherence tomography angiographic (OCTA) images of two eyes with pathologic myopia. Observations Two eyes of 2 cases with pathologic myopia were examined by OCTA (RTVue XR Avanti, Optovue, and Cirrus 5000, Zeiss). Case 1 was a 64-year-old man, and Case 2 was a 65-year-old woman. In Case 1, the thickness of the subfoveal choroid was 38 m and ...
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    9. CHOROIDAL BLOOD FLOW VISUALIZATION IN HIGHLY MYOPIA USING A PROJECTION ARTIFACT METHOD IN OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY

      CHOROIDAL BLOOD FLOW VISUALIZATION IN HIGHLY MYOPIA USING A PROJECTION ARTIFACT METHOD IN OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY
      Purpose: To visualize choroidal blood flow in larger vessels in highly myopic eyes using a phenomenon of the projection artifact to in the sclera using optical coherence tomography angiography. Methods: The retrospective study included 92 eyes (54 patients) with greater than 8 diopters of myopia. All eyes were examined using optical coherence tomography angiography (RTVue XR Avanti; Optovue Inc, Fremont, CA). The blood flow in choroidal vessels was evaluated by ...
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    10. MACULAR HOLE FORMATION IDENTIFIED WITH INTRAOPERATIVE OCT DURING VITRECTOMY FOR VITREOMACULAR TRACTION SYNDROME

      MACULAR HOLE FORMATION IDENTIFIED WITH INTRAOPERATIVE OCT DURING VITRECTOMY FOR VITREOMACULAR TRACTION SYNDROME
      Purpose: To report the identification of macular hole formation using intraoperative optical coherence tomography (OCT) during vitrectomy for vitreomacular traction syndrome. Methods: A 58-year-old woman with vitreomacular traction syndrome underwent the vitrectomy using the 25-gauge system with scanning the macular area using the integrated and intraoperative OCT (Rescan 700, Zeiss). When posterior vitreous detachment at the fovea was performed using a vitreous cutter, the hyperreflective tissue thought to be the ...
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      Mentions: Hideki Koizumi
    11. Optical coherence tomographic predictor of retinal non-perfused areas in eyes with macular oedema associated with retinal vein occlusion

      Optical coherence tomographic predictor of retinal non-perfused areas in eyes with macular oedema associated with retinal vein occlusion
      Aim To determine whether the low reflective spaces in the retinal nerve fibre layer (RNFL) in the optical coherence tomographic (OCT) images are related to the presence of the retinal non-perfused areas in eyes with macular oedema associated with a retinal vein occlusion (RVO). Methods We reviewed the medical records of 97 eyes with macular oedema associated with RVO. At the initial visit, eyes with macular oedema were classified into ...
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    12. Age-Dependent Morphologic Alterations in the Outer Retinal and Choroidal Thicknesses Using Swept Source Optical Coherence Tomography

      Age-Dependent Morphologic Alterations in the Outer Retinal and Choroidal Thicknesses Using Swept Source Optical Coherence Tomography
      Purpose To evaluate the age-dependent morphologic alterations in the outer retina and choroid at the macula using swept-source optical coherence tomography (OCT). Methods Thirty eyes (30 normal subjects; average age, 49 years) were examined; five (age range, third-eighth decades of life) had refractive errors of 2 diopters or less and no fundus abnormalities. An Early Treatment Diabetic Retinopathy Study (ETDRS) map of the outer retinal and choroidal thickness was constructed ...
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      Mentions: Hideki Koizumi
    13. Enhanced Depth Imaging Optical Coherence Tomography

      Enhanced Depth Imaging Optical Coherence Tomography
      Imaging the choroid with conventional commercial spectral-domain optical coherence tomography (SD-OCT) has been difficult, mainly because of difficulty in signal transmission beyond the retinal pigment epithelium. A recent modification to the standard technique, termed enhanced depth imaging optical coherence tomography (EDI-OCT), was able to image the choroid with reasonable clarity using commercial SD-OCTs. The aim of this article was to review the technique, principle, recent findings, and possible future developments ...
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  2. About Hideki Koizumi

    Hideki Koizumi is with the Tokyo Women's Medical University.