1. Articles from M. Shahidul Islam

    1-6 of 6
    1. Investigation of Biodegradable Composite Coated Magnesium Alloy Using Optical Coherence Tomography

      Investigation of Biodegradable Composite Coated Magnesium Alloy Using Optical Coherence Tomography

      Optical coherence tomography (OCT) was used to characterize poly (lactic-co-glycolic acid) (PLGA) and nanophase hydroxyapatite (nHA) / PLGA coatings on magnesium (Mg) substrates before and after immersion in revised simulated body fluid (rSBF) under standard cell culture conditions. The OCT images clearly showed: the surface of the coatings, the metallic surface underneath the coatings, the presence of a dispersed phase within the polymer matrix, and defects and structural changes to the coatings. This study demonstrated the potential utility of OCT for performing quality assurance tests and for tracking the physical effects of degradation upon biomedical implants due to its ability to ...

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    2. A common-path optical coherence tomography based electrode for structural imaging of nerves and recording of action potentials

      A common-path optical coherence tomography based electrode for structural imaging of nerves and recording of action potentials

      Current technologies for monitoring neural activity either use different variety of electrodes (electrical recording) or require contrast agents introduced exogenously or through genetic modification (optical imaging). Here we demonstrate an optical method for non-contact and contrast agent free detection of nerve activity using phase-resolved optical coherence tomography (pr-OCT). A common-path variation of the pr-OCT is recently implemented and the developed system demonstrated the capability to detect rapid transient structural changes that accompany neural spike propagation. No averaging over multiple trials was required, indicating its capability of single-shot detection of individual impulses from functionally stimulated Limulus optic nerve. The strength of ...

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    3. Feature Of The Week 10/28/12: UC Riverside Presents GPU Accelerated Real-Time Multi-Functional SD-OCT system at 1300nm

      Feature Of The Week 10/28/12: UC Riverside Presents GPU Accelerated Real-Time Multi-Functional SD-OCT system at 1300nm

      We present a GPU accelerated multi-functional spectral domain optical coherence tomography system at 1300nm. The system is capable of real-time processing and display of every intensity image, comprised of 512 pixels by 2048 A-lines acquired at 20 frames per second. The update rate for all four images with size of 512 pixels by 2048 A-lines simultaneously (intensity, phase retardation, flow and en face view) is approximately 10 frames per second. Additionally, we report for the first time the characterization of phase retardation and diattenuation by a sample comprised of a stacked set of polarizing film and wave plate. The calculated ...

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    4. In vivo detection of cortical optical changes associated with seizure activity with optical coherence tomography

      In vivo detection of cortical optical changes associated with seizure activity with optical coherence tomography
      The most common technology for seizure detection is with electroencephalography (EEG), which has low spatial resolution and minimal depth discrimination. Optical techniques using near-infrared (NIR) light have been used to improve upon EEG technology and previous research has suggested that optical changes, specifically changes in near-infrared optical scattering, may precede EEG seizure onset in in vivo models. Optical coherence tomography (OCT) is a high resolution, minimally invasive imaging technique, which can produce depth resolved cross-sectional images. In this study, OCT was used to detect changes in optical properties of cortical tissue in vivo in mice before and during the induction ...
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    5. GPU accelerated real-time multi-functional spectral-domain optical coherence tomography system at 1300nm

      GPU accelerated real-time multi-functional spectral-domain optical coherence tomography system at 1300nm

      We present a GPU accelerated multi-functional spectral domain optical coherence tomography system at 1300nm. The system is capable of real-time processing and display of every intensity image, comprised of 512 pixels by 2048 A-lines acquired at 20 frames per second. The update rate for all four images with size of 512 pixels by 2048 A-lines simultaneously (intensity, phase retardation, flow and en face view) is approximately 10 frames per second. Additionally, we report for the first time the characterization of phase retardation and diattenuation by a sample comprised of a stacked set of polarizing film and wave plate. The calculated ...

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    6. Extracting structural features of rat sciatic nerve using polarization-sensitive spectral domain optical coherence tomography

      Extracting structural features of rat sciatic nerve using polarization-sensitive spectral domain optical coherence tomography

      We present spectral domain polarization-sensitive optical coherence tomography (SD PS-OCT) imaging of peripheral nerves. Structural and polarization-sensitive OCT imaging of uninjured rat sciatic nerves was evaluated both qualitatively and quantitatively. OCT and its functional extension, PS-OCT, were used to image sciatic nerve structure with clear delineation of the nerve boundaries to muscle and adipose tissues. A long-known optical effect, bands of Fontana, was also observed. Postprocessing analysis of these images provided significant quantitative information, such as epineurium thickness, estimates of extinction coefficient and birefringence of nerve and muscle tissue, frequency of bands of Fontana at different stretch levels of nerve ...

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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) UC Riverside
    2. (6 articles) B. Hyle Park
    3. (6 articles) M. Shahidul Islam
    4. (5 articles) Yan Wang
    5. (1 articles) Massachusetts General Hospital
    6. (1 articles) VU University Amsterdam
    7. (1 articles) Johannes F. de Boer
    8. (1 articles) Carissa L. Reynolds
    9. (1 articles) University of Copenhagen
    10. (1 articles) Center for Ophthalmic Optics and Lasers
    11. (1 articles) FDA
    12. (1 articles) Oregon Health & Science University
    13. (1 articles) SUNY at Stony Brook
    14. (1 articles) University College London
    15. (1 articles) David Huang
    16. (1 articles) Axel Petzold
    17. (1 articles) Perimeter Medical Imaging
    18. (1 articles) Carl Zeiss Meditec
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    Extracting structural features of rat sciatic nerve using polarization-sensitive spectral domain optical coherence tomography GPU accelerated real-time multi-functional spectral-domain optical coherence tomography system at 1300nm In vivo detection of cortical optical changes associated with seizure activity with optical coherence tomography Feature Of The Week 10/28/12: UC Riverside Presents GPU Accelerated Real-Time Multi-Functional SD-OCT system at 1300nm A common-path optical coherence tomography based electrode for structural imaging of nerves and recording of action potentials Investigation of Biodegradable Composite Coated Magnesium Alloy Using Optical Coherence Tomography EARLY SPECTRAL-DOMAIN OPTICAL COHERENCE TOMOGRAPHY BIOMARKERS TO CONFIRM FELLOW EYE CHANGES IN ASYMMETRIC TYPE-2 MACULAR TELANGIECTASIA Relative Postpartum Retinal Vasoconstriction Detected With Optical Coherence Tomography Angiography 1.1 μm waveband tunable laser using emission-wavelength-controlled InAs quantum dots for swept-source optical coherence tomography applications Retinal nerve fibre layer and peripapillary vascular density by optical coherence tomography angiography in schizophrenia Livelayer: A Semi-Automatic Software Program for Segmentation of Layers and Diabetic Macular Edema in Optical Coherence Tomography Images Long-term progression of myopic maculopathy in degenerative myopia as imaged by SD-OCT and IR imaging