1. Articles from Haishu Tan

    1-4 of 4
    1. Image enhancement of wide-field retinal optical coherence tomography angiography by super-resolution angiogram reconstruction generative adversarial network

      Image enhancement of wide-field retinal optical coherence tomography angiography by super-resolution angiogram reconstruction generative adversarial network

      Wide-field retinal optical coherence tomography angiography (OCTA) usually suffers from low image resolution in clinical practice because of insufficient lateral sampling. In this study, we develop a deep-learning-based method named super-resolution angiogram reconstruction generative adversarial network (SAR-GAN) to enhance the en face OCTA image quality. A sophisticated home-made spectral-domain OCTA system is employed to capture the data of retinal angiograms with different scanning protocols. High-resolution 3 × 3 mm 2 OCTA images and low-resolution (LR) 6 × 6 mm 2 OCTA images are utilised in training the network. We propose an improved loss function for SAR-GAN for the reconstruction of perceptually enhanced ...

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    2. Automatic Segmentation and Measurement of Choroid Layer in High Myopia for OCT Imaging Using Deep Learning

      Automatic Segmentation and Measurement of Choroid Layer in High Myopia for OCT Imaging Using Deep Learning

      Automatic segmentation and measurement of the choroid layer is useful in studying of related fundus diseases, such as diabetic retinopathy and high myopia. However, most algorithms are not helpful for choroid layer segmentation due to its blurred boundaries and complex gradients. Therefore, this paper aimed to propose a novel choroid segmentation method that combines image enhancement and attention-based dense (AD) U-Net network. The choroidal images obtained from optical coherence tomography (OCT) are pre-enhanced by algorithms that include flattening, filtering, and exponential and linear enhancement to reduce choroid-independent information. Experimental results obtained from 800 OCT B-scans of the choroid layers from ...

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    3. Design of 1300-nm spectral domain optical coherence tomography angiography system for iris microvascular imaging

      Design of 1300-nm spectral domain optical coherence tomography angiography system for iris microvascular imaging

      Developing a high-resolution non-invasive optical coherence tomography angiography (OCTA) method for iris vasculature imaging is essential for diagnosing a wide range of ocular pathologies. However, the current iris-OCTA devices are still limited in imaging quality and penetration depth for dark-colored eyes ranging from brown to dark brown. A spectral domain iris-OCTA system is presented in this paper incorporating a 1300 nm wavelength for deeper tissue penetration, a linear-wavenumber spectrometer for better detection sensitivity, and an iris scan objective lens for better optical focusing across the entire iris over a 12 × 12 mm2 scan field. The −6 dB fall-off range is ...

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    4. Spectrometer calibration with reduced dispersion for optical coherence tomography

      Spectrometer calibration with reduced dispersion for optical coherence tomography

      A wavelength calibration method is proposed for Fourier domain optical coherence tomography. In the present study, the wavelength remapping procedure is based on the spectral phase function determined by the calibration signal. To accomplish high accuracy feature for wavelength calibration, a common-path interferometer is employed. Two autocorrelation interferograms generated from the common-path interferometer are utilized as the calibration signals. The advantage of the interferometer proposed here is that the accurate optical path difference of the calibration signals could be acquired easily. The wavelength distribution in the spectrometer was deduced with the phase signal. The approach was compared to a wavelength-determined ...

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    1-4 of 4
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  2. Topics in the News

    1. (1 articles) Harbin Medical University
    2. (1 articles) Tianjin University
    3. (1 articles) University of Houston
    4. (1 articles) Harvard University
    5. (1 articles) UC Davis
    6. (1 articles) Massachusetts General Hospital
    7. (1 articles) Vanderbilt University
    8. (1 articles) UT Southwestern Medical Center
    9. (1 articles) Tokyo Medical & Dental University
    10. (1 articles) Oregon Health & Science University
    11. (1 articles) Erasmus University
    12. (1 articles) Visionix
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    Spectrometer calibration with reduced dispersion for optical coherence tomography Design of 1300-nm spectral domain optical coherence tomography angiography system for iris microvascular imaging Automatic Segmentation and Measurement of Choroid Layer in High Myopia for OCT Imaging Using Deep Learning Image enhancement of wide-field retinal optical coherence tomography angiography by super-resolution angiogram reconstruction generative adversarial network Macular and choroidal perfusion using optical coherence tomography angiography in type-2 diabetic patients without diabetic retinopathy Short-term evaluation of clear corneal incision after phacoemulsification using anterior segment optical coherence tomography Evaluation of the central vault following implantable phakic contact lens and its correlation to horizontal white to white corneal diameter by anterior segment optical coherence tomography Automatic bifurcation detection utilizing pullback characteristics of bifurcation in intravascular optical coherence tomography An IoT based predictive modeling for Glaucoma detection in optical coherence tomography images using hybrid genetic algorithm The Value of Optical Coherence Tomography Angiography in Pituitary Adenomas Effectiveness of optical coherence tomography angiography (OCT-A) in staging glaucoma Quantitative dynamic cellular imaging based on 3d unwrapped optical coherence phase microscopyoptical coherence phase microscopy (Thesis)