1. Articles from Hong Zhao

    1-7 of 7
    1. Assessment of capillary dropout in the superficial retinal capillary plexus by optical coherence tomography angiography in the early stage of diabetic retinopathy

      Assessment of capillary dropout in the superficial retinal capillary plexus by optical coherence tomography angiography in the early stage of diabetic retinopathy

      Background To assess capillary dropout in the superficial retinal capillary plexus (SCP) by optical coherence tomography angiography (OCTA) in the early stage of diabetic retinopathy (DR). Methods This study was a cross-sectional observational study. Patients that underwent OCTA examinations in our hospital between November 2015 and May 2016 were included in the study. The subjects were divided into two groups: A) normal controls (41 eyes of 41 subjects) and B) the DR patients (49 eyes of 49 patients with mild non-proliferative DR (NPDR)). The retinal thickness and SCP vessel density were analyzed using built-in software in nine sections of the ...

      Read Full Article
    2. Assessment of choroidal osteoma complicating choroidal neovascularization by optical coherence tomography angiography

      Assessment of choroidal osteoma complicating choroidal neovascularization by optical coherence tomography angiography

      Purpose Choroidal osteoma (CO) frequently leads to progressive visual loss due to complications of secondary choroidal neovascularization (CNV).We report herein the function of optical coherence tomography angiography (OCTA) in observation of CO complicating CNV. Methods A 25-year-old female presented to our hospital with chief complaint of sudden unilateral visual acuity decrease for one week, with metamorphopsia in the left eye. Her best corrected visual acuity was 0.12 in the left eye. Then complete ophthalmological examinations including fundus photography, B-scan ultrasound, fundus fluorescent angiography, and spectral-domain optical coherence tomography (SD-OCT) were performed. She was diagnosed as CO on the ...

      Read Full Article
    3. Film thickness measurement and defect inspection using optical coherence tomography

      Film thickness measurement and defect inspection using optical coherence tomography

      An optical sensing technology based on optical coherence tomography is presented for film thickness measurement and defect inspection. In order to improve the imaging quality, a simple interference spectrum processing procedure is proposed to eliminate the DC and the autocorrelation noise. With the proposed method, we obtain high quality one-dimensional depth and two-dimensional cross-sectional images of the films. Then, the thickness and the defect information of the film can be obtained from the acquired images. The experiment result demonstrates that this nondestructive imaging technique is applicable for measuring film thickness and inspecting defects.

      Read Full Article
    4. Spectral-Domain Optical Coherence Tomography for Material Detection

      Spectral-Domain Optical Coherence Tomography for Material Detection

      Optical coherence tomography is a non-invasive cross-sectional imaging technology for inhomogeneous samples. Spectral-domain optical coherence tomography is introduced to measure film and Silicon dovetail groove in this paper. A novel method is used to deal with the interference spectrum to improve the quality of the two-dimensional cross-sectional image. The experimental result shows the microstructure of the two samples can be clearly seen as expected. From the visualized two-dimensional cross-sectional imaging, the film thickness and the dimension of the Silicon dovetail groove are obtained with this technique. It is experimentally demonstrated that this system is useful for imaging the microstructure of ...

      Read Full Article
    5. High resolution spectral-domain optical coherence tomography using a thermal light source

      High resolution spectral-domain optical coherence tomography using a thermal light source
      Abstract A high resolution spectral-domain optical coherence tomography (SD-OCT) system based on a thermal light source was presented. A novel normalized method was introduced to remove the background noise and the DC noise of the interference spectrum. A Gaussian spectral calibration procedure was performed to improve axial resolution and image quality before reconstructing OCT image. With the proposed method, the quality of the obtained images was greatly improved. Two-dimensional (2D) cross-sectional images with axial resolution of 1.2 μm were obtained. Furthermore, the film thickness of single-layer film sample was obtained. The experimental result demonstrates the SD-OCT system has potential ...
      Read Full Article
    6. Spectral-domain optical coherence tomography (SD-OCT) with a thermal light source

      Optical coherence tomography (OCT), as a noninvasive imaging technique, has been widely applied in biological and medical fields. The light sources commonly used in OCT are the partially coherent light sources which usual exhibits typically the resolution of 15 to 20 µm. In another approach for an extremely broadband light source is a thermal light source (white light), which may have the potential to supply a compact and low-cost OCT system. In addition, current the majority of OCT measurements are executed in the time domain systems, which are limited in the image acquisition rate and sensitivity. However, a spectral domain ...
      Read Full Article
    7. Investigation on spectral-domain optical coherence tomography using a tungsten halogen lamp as light source

      Abstract  The objective of this research was to investigate a new detection method using a thermal light source in a spectral domain optical coherence tomography (SDOCT) operation to improve both image acquisition rate and axial resolution economically. A tungsten halogen lamp was chosen as the illumination source and a Michelson fiber interferometer was employed to generate the interference pattern of an object collected by a spectrometer; the inner structure of the object was obtained from the interference pattern by a Fourier transform. An experiment was performed by measuring a thin film coated on a glass base with the system, and ...
      Read Full Article
    1-7 of 7
  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. (4 articles) Shanghai Jiao Tong University
    2. (1 articles) Jikei University School of Medicine
    3. (1 articles) Macquarie University
    4. (1 articles) Medical University of Vienna
    5. (1 articles) University of Florence
    6. (1 articles) National Institutes of Health
    7. (1 articles) Beth Israel Deaconess Medical Center
    8. (1 articles) Giacomo Savini
    9. (1 articles) Bernhard Baumann
    10. (1 articles) Antonia Lichtenegger
    11. (1 articles) Movu
  3. Popular Articles

  4. Picture Gallery

    High resolution spectral-domain optical coherence tomography using a thermal light source Spectral-Domain Optical Coherence Tomography for Material Detection Film thickness measurement and defect inspection using optical coherence tomography Assessment of choroidal osteoma complicating choroidal neovascularization by optical coherence tomography angiography Assessment of capillary dropout in the superficial retinal capillary plexus by optical coherence tomography angiography in the early stage of diabetic retinopathy Heterogeneity of Neointimal Healing Following Biodegradable-polymer Drug-Eluting Coronary Stent Implantation Swept-source and multimodal OCT technologies offer clinical advantages Early vascular response of ultra-thin bioresorbable polymer sirolimus-eluting stents assessed by optical frequency domain imaging: the EVALUATION study OCT, OCTA show promise in screening for DR Improved Diagnostic Imaging of Brain Tumors by Multimodal Microscopy and Deep Learning Thromboembolic or atherosclerotic? Optical coherence tomography in determining the cause of myocardial infarction with ST-segment elevation Application of Artificial Intelligence in Targeting Retinal Diseases