1. Articles from Hideki Koizumi

    1-20 of 20
    1. QUANTIFICATION OF CHOROIDAL VASCULATURE BY HIGH-QUALITY STRUCTURE EN FACE SWEPT-SOURCE OPTICAL COHERENCE TOMOGRAPHY IMAGES IN EYES WITH CENTRAL SEROUS CHORIORETINOPATHY

      QUANTIFICATION OF CHOROIDAL VASCULATURE BY HIGH-QUALITY STRUCTURE EN FACE SWEPT-SOURCE OPTICAL COHERENCE TOMOGRAPHY IMAGES IN EYES WITH CENTRAL SEROUS CHORIORETINOPATHY

      Purpose: To determine the density of the choroidal vasculature by high-quality structure en face optical coherence tomography (OCT) scanned at the same time as OCT angiography in eyes with central serous chorioretinopathy (CSC). Methods: Thirty-five eyes of 30 patients with CSC (20 men and 10 women; average age, 48.4 years) were studied. Volume scans (12 × 12 mm-square) were obtained at the same time as OCT angiographic scans (Plex Elite 9000; Swept-Source OCT, Zeiss). High-quality structure en face images were flattened at Bruch membrane and binarized to identify and quantify the choroidal vascular density by the Bernsen method of the ...

      Read Full Article
      Mentions: Hideki Koizumi
    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, Topcon, Japan) and fundus autofluorescence (CX-1 MYD/NM, Canon, Japan) were also recorded from all eyes. Results Four eyes (1.5%) of 3 patients (2 men, 1 woman; average age ...

      Read Full Article
    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, Topcon, Japan) and fundus autofluorescence (CX-1 MYD/NM, Canon, Japan) were also recorded from all eyes. Results Four eyes (1.5%) of 3 patients (2 men, 1 woman; average age ...

      Read Full Article
    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 100 averaged scans, were obtained within a 5- × 15-degree rectangle centered on the fovea. The choroidal thickness under the fovea in each image was measured by independent observers. Results The ...

      Read Full Article
    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 attempting to directly segment the choroid and also by placing the segmentation layer behind the choroid, within the sclera. Subfoveal choroidal thickness was also measured at the same time. The ...

      Read Full Article
    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 en-face OCTA with an 840-nm light source (RTVue XR Avanti; Optovue Inc), which system can obtain standard en-face OCT images at identical areas. Images on en-face OCTA and standard en-face ...

      Read Full Article
    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 area in the FAF images. FAF and OCTA images allowed us to detect damage of the RPE before the choriocapillaris atrophy in a case of presumed choroideremia with preserved central ...

      Read Full Article
      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 μm and the sclera was 274 μm, and they were 17 μm and 214 μm, respectively, in Case 2. The axial length was 35.8 mm in Case 1 and 29.5 ...

      Read Full Article
    9. 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 rupture of the internal limiting membrane and the full-thickness macular hole were identified on the horizontal and vertical scans simultaneously in intraoperative OCT. Results: The procedure was completed after internal ...

      Read Full Article
      Mentions: Hideki Koizumi
    10. 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 those with and those without low reflective spaces in the RNFL in the OCT images. In the fluorescein angiographic (FA) images, the eyes with more than one disc diameter of ...

      Read Full Article
    11. 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 using swept-source OCT. The outer retinal and choroidal segmentation lines were drawn automatically, partially manually, within 6 millimeters of the macula. Results The mean outer retinal and choroidal thicknesses in ...

      Read Full Article
      Mentions: Hideki Koizumi
    12. 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 regarding EDI-OCT. A MEDLINE search on all published articles on EDI-OCT was performed up to December 2010. The principle behind EDI-OCT was discussed. Modification to the conventional technique in image ...
      Read Full Article
    13. High-Resolution Photoreceptor Imaging in Idiopathic Macular Telangiectasia Type 2 Using Adaptive Optics Scanning Laser Ophthalmoscopy

      High-Resolution Photoreceptor Imaging in Idiopathic Macular Telangiectasia Type 2 Using Adaptive Optics Scanning Laser Ophthalmoscopy

      Purpose. To study pathologic changes in the photoreceptors in eyes with idiopathic macular telangiectasia (MacTel) type 2 using adaptive optics scanning laser ophthalmoscopy (AO-SLO). Methods. Thirteen eyes with nonproliferative MacTel type 2 and 10 normal eyes underwent a full ophthalmologic examination, spectral-domain optical coherence tomography (SD-OCT), and imaging with an original prototype AO-SLO system. All eyes with MacTel type 2 were examined with fluorescein angiography (FA), fundus autofluorescence (FAF), confocal blue reflectance (CBR), and fundus-monitoring microperimetry (MP). Results. All eyes with MacTel type 2 had ring-like dark areas and/or small patchy regions on AO-SLO images; significantly lower cone density ...

      Read Full Article
    14. 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 100 averaged scans, were obtained within a 5- × 15-degree rectangle centered on the fovea. The choroidal thickness under the fovea in each image was measured by independent observers.Results: The ...
      Read Full Article
    15. Spectral Domain Optical Coherence Tomographic Findings of Occult Macular Dystrophy

      Occult macular dystrophy is a rare macular disorder in which patients have bilaterally decreased visual acuity without any significant ophthalmoscopic findings. Using spectral domain optical coherence tomography, the authors found a defect in the junction between the inner and outer segments of the foveal photoreceptors in a patient with occult macular dystrophy. [Ophthalmic Surg Lasers Imaging 2008;39:S114-S116.]
      Read Full Article
    16. Disruption of the Photoreceptor Inner Segment-Outer Segment Junction in Eyes With Macular Holes

      Purpose: To examine the relationship between visual acuity and morphologic characteristics of macular holes as determined using spectral domain optical coherence tomography (SD OCT). Methods: A retrospective analysis was performed of eyes with open and closed macular holes at a single, referral-based retina practice. The main outcome measures included best-corrected Snellen visual acuity and SD OCT findings, including the size of the macular hole and the disruption of the junction between inner segments (ISs) and outer segments (OSs) of the photoreceptors. Results: The mean visual acuity for eyes with open (n = 24) and closed (n = 17) macular holes was 20 ...
      Read Full Article
    17. Ultrastructural Correlation of Spectral-Domain Optical Coherence Tomographic Findings in Vitreomacular Traction Syndrome

      Purpose To examine the ultrastructural correlates of spectral-domain optical coherence tomography (SD-OCT) findings in patients with vitreomacular traction (VMT). Design Observational case series. Methods Retrospective analysis of six eyes of consecutive patients who underwent vitrectomy surgery for VMT was performed in this single-center, noncomparative study. One patient had a concurrent macular hole. Preoperative assessment included SD-OCT examination with 3-dimensional image reconstruction. During surgery the vitreous cone was dissected from the vitreous body using scissors, then removed from the surface of the retina with a combination of sharp dissection and peeling, and subsequently submitted for histologic and transmission electron microscopic processing ...
      Read Full Article
    18. 3D Spectral Optical Coherence Tomography Documentation Of A Retinal Vein Occlusion Associated With A Pigment Epithelial Detachment.

      3D Spectral Optical Coherence Tomography Documentation Of A Retinal Vein Occlusion Associated With A Pigment Epithelial Detachment.

      Purpose: To describe a case of a pigment epithelial detachment (PED) that likely led to a branch retinal vein occlusion (BRVO). Methods: Color photography, fluorescein angiography, and three-dimensional spectral optical coherence tomography (3D-spectral OCT) were performed. Results: Fluorescein angiography identified a PED at the site of a BRVO, and 3D-spectral OCT illustrated compression and distortion of the overlying retina at the location of the venous obstruction. Conclusion: It is well known that retinal arterial disease can compress an underlying vein and lead to a BRVO. A theoretically possible, but previously unrecognized cause of a BRVO is compression of an overlying ...

      Read Full Article
    19. Three-Dimensional Evaluation of Vitreomacular Traction and Epiretinal Membrane Using Spectral-Domain Optical Coherence Tomography

      Three-Dimensional Evaluation of Vitreomacular Traction and Epiretinal Membrane Using Spectral-Domain Optical Coherence Tomography

      Purpose To delineate the 3-dimensional (3-D) relationship in vitreomacular traction (VMT) and idiopathic epiretinal membrane (ERM). Design Observational case series. Methods Forty-eight evaluable eyes of 35 patients with VMT or idiopathic ERM were investigated with spectral-domain (SD) optical coherence tomography (OCT). VMT was defined as focal if the diameter of the vitreous attachment was 1500 μm or less and broad if it was more than 1500 μm. The 3-D OCT representation of vitreomacular interface abnormalities was evaluated. Results Focal VMT was seen in five eyes. Broad

      Read Full Article
    1-20 of 20
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. Topics in the News

    1. (20 articles) Hideki Koizumi
    2. (9 articles) LuEsther T. Mertz Retinal Research Center
    3. (8 articles) Richard F. Spaide
    4. (5 articles) Optovue
    5. (2 articles) Kyoto Prefectural University of Medicine
    6. (2 articles) K. Bailey Freund
    7. (2 articles) Topcon Medical Systems
    8. (1 articles) Yale L. Fisher
    9. (1 articles) Lawrence A. Yannuzzi
    10. (1 articles) Nidek
    11. (1 articles) Sun Yat-Sen University
    12. (1 articles) National Institutes of Health
    13. (1 articles) University of Illinois at Urbana-Champaign
    14. (1 articles) Tianjin University
    15. (1 articles) Zhejiang University
    16. (1 articles) New York Eye and Ear Infirmary
    17. (1 articles) Eric J. Chaney
    18. (1 articles) Jun Zhang
    19. (1 articles) Robert Ritch
    20. (1 articles) Stephen A. Boppart
  3. Popular Articles

  4. Picture Gallery

    Three-Dimensional Evaluation of Vitreomacular Traction and Epiretinal Membrane Using Spectral-Domain Optical Coherence Tomography 3D Spectral Optical Coherence Tomography Documentation Of A Retinal Vein Occlusion Associated With A Pigment Epithelial Detachment. High-Resolution Photoreceptor Imaging in Idiopathic Macular Telangiectasia Type 2 Using Adaptive Optics Scanning Laser Ophthalmoscopy Enhanced Depth Imaging Optical Coherence Tomography Choroidal Blood Flow Visualization In High Myopia Using A Projection Artifact Method In Optical Coherence Tomography Angiography Optical coherence tomography angiography in glaucoma Handheld optical coherence tomography for clinical assessment of dental plaque and gingiva Characterisation of macular superficial vessel density alteration in preclinical ethambutol-induced optic neuropathy using optical coherence tomography angiography Three-dimensional spatial reconstruction of coronary arteries based on fusion of intravascular optical coherence tomography and coronary angiography Dynamic-range compression and contrast enhancement in swept-source optical coherence tomography systems with a frequency gain compensation amplifier Healing and early stent coverage after ultrathin strut biodegradable polymer-coated sirolimus-eluting stent implantation: SiBi optical coherence tomography study Optical coherence tomography angiography of choroidal neovascularization in immune choroiditis following acute retinal necrosis