1. King Abdullah University of Science and Technology

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    1. Mentioned In 18 Articles

    2. 3D-printed fiber-based zeroth- and high-order Bessel beam generator

      3D-printed fiber-based zeroth- and high-order Bessel beam generator
      Bessel beams (BBs) have gained prominence thanks to their diffraction-free propagation and self-healing properties. These beams are conventionally generated using different approaches, namely by transforming a narrow circular beam with a lens, using axicons or holographic beam-shaping techniques. These methods involve space-consuming optics. To overcome this limitation, in the past, efforts have been made to create BBs directly from optical fibers. However, these solutions have limited capability to generate BBs ...
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    3. Progression of Enamel Demineralisation Around Fissure Sealants: Optical Coherence Tomography Study

      Progression of Enamel Demineralisation Around Fissure Sealants: Optical Coherence Tomography Study
      Purpose: To evaluate the progression of enamel demineralisation around fissure sealants using cross-polarisation optical coherence tomography (CP-OCT). Materials and Methods: Three fissure sealants; Fuji Triage (FJ, GC), Beautisealant (BT, Shofu) and Helioseal resin sealant (HL, Ivoclar Vivadent) were placed in cavities (3 0.5 1 mm) prepared in bovine enamel blocks (n = 5). After 7-day artificial saliva incubation, specimens were subjected to demineralisation for 4 weeks (pH 4.5). CP-OCT ...
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    4. Nondestructive evaluation of microleakage in restored primary teeth using CP-OCT

      Nondestructive evaluation of microleakage in restored primary teeth using CP-OCT
      Background: Although the demand for esthetic filling of primary teeth with resin composite is increasing, there is no enough data on the adhesive performance of composite restorations in primary teeth. Despite the improvements in resin composites, interfacial gap is still a disadvantage as it may cause marginal staining, secondary caries, and restoration failure. Previous studies have validated the efficiency of optical coherence tomography (OCT) in the evaluation of adhesive interface ...
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    5. Evaluation of microleakage in class-II bulk-fill composite restorations

      Evaluation of microleakage in class-II bulk-fill composite restorations
      Background/purpose Despite the clinical appeal of restoring deep class II cavities in single increment using bulk-fill resin composite, sealing of bulk-filled composite restorations is a concern. This study evaluated interfacial adaptation of bulk-fill composite restoration to axial wall and gingival floor of class II cavities using cross-polarization optical coherence tomography (CP-OCT). Materials and methods Box-shaped class II cavities were prepared in extracted molars and divided into three groups ( n ...
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    6. Optical comparison between micro-CT and OCT in imaging of marginal composite adaptation; Observational study

      Optical comparison between micro-CT and OCT in imaging of marginal composite adaptation; Observational study
      Dental composite is the most used aesthetic restorative biomaterial worldwide. However, it undergoes polymerization shrinkage that could lead to loss of the interfacial seal between tooth and resin in some circumstances. This demands high-resolution imaging technologies to detect these defects. This study carried out a comparison between microcomputed tomography (micro-CT; Shimadzu, Japan) and swept-source optical coherence tomography (SS-OCT; Santec, Japan) in the detection of marginal adaptation defects at the tooth-resin ...
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    7. Posterior Segment Optical Coherence Tomography Findings in a Case of Nephropathic Cystinosis

      Posterior Segment Optical Coherence Tomography Findings in a Case of Nephropathic Cystinosis
      Cystinosis is a rare autosomal recessive lysosomal storage disorder characterized by abnormal accumulation of intracellular cystine in various tissues including the brain, kidneys, bones, and eyes. Infantile nephropathic cystinosis is the most severe phenotype of cystinosis that has been associated with a wide spectrum of ocular features. In this report, the author describes a posterior segment spectral-domain optical coherence tomography (SD-OCT) finding that has not been previously reported in a ...
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    8. Does lining class-II cavities with flowable composite improve the interfacial adaptation?

      Does lining class-II cavities with flowable composite improve the interfacial adaptation?
      The objective of this study was to assess in-vitro interfacial cavity adaptation of different adhesive/composites systems in class-II restoration using SS-OCT and to confirm the findings with a confocal laser scanning microscope (CLSM). Standardized rectangular-shaped class-II cavities were prepared on 24 extracted human molar teeth, bonded with adhesive and lined with flowable composite. Cavities were further restored by bulk filling using packable composite. Specimens were divided into four groups ...
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    9. Measurement of Normative Foveal Avascular Zone Parameters in Healthy Adults Using Optical Coherence Tomography Angiography

      Measurement of Normative Foveal Avascular Zone Parameters in Healthy Adults Using Optical Coherence Tomography Angiography
      Background and Objective: The purpose of this study was to quantify the geometric dimension of the foveal avascular zone (FAZ) area and its index measurement of morphology as a circle (acircularity index) in healthy participants according to age and sex, using optical coherence tomography angiography (OCTA). Study Design/Materials and Method: This is a cross-sectional descriptive study conducted at LV Prasad Eye Institute, India. Written informed consent was obtained from ...
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    10. Evaluating the effect of different draw solutes in a baffled osmotic membrane bioreactor-microfiltration using optical coherence tomography with real wastewate

      Evaluating the effect of different draw solutes in a baffled osmotic membrane bioreactor-microfiltration using optical coherence tomography with real wastewate
      This study investigated the performance of an integrated osmotic and microfiltration membrane bioreactor for real sewage employing baffles in the reactor. To study the biofouling development on forward osmosis membranes optical coherence tomography (OCT) technique was employed. On-line monitoring of biofilm growth on a flat sheet cellulose triacetate forward osmosis (CTA-FO) membrane was conducted for 21 days. Further, the process performance was evaluated in terms of water flux, organic and ...
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    11. Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

      Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis
      Fouling development in direct contact membrane distillation (DCMD) for seawater desalination was evaluated combining in-situ monitoring performed using optical coherence tomography (OCT) together with destructive techniques. The non-invasive monitoring with OCT provided a better understanding of the fouling mechanism by giving an appropriate sampling timing for the membrane autopsy. The on-line monitoring system allowed linking the flux trend with the structure of fouling deposited on the membrane surface. The water ...
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    12. Biofouling investigation in membrane filtration systems using Optical Coherence Tomography (OCT) (Thesis)

      Biofouling investigation in membrane filtration systems using Optical Coherence Tomography (OCT)  (Thesis)
      Biofouling represents the main problem in membrane filtration systems. Biofouling arises when the biomass growth negatively impacts the membrane performance parameters (i.e. flux decrease and feed channel pressure drop). Most of the available techniques for characterization of biofouling involve membrane autopsies, providing information ex-situ destructively at the end of the process. OCT, is non-invasive imaging technique, able to acquire scans in-situ and non-destructively. The objective of this study was ...
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    13. Statistical model for OCT image denoising

      Statistical model for OCT image denoising
      Optical coherence tomography (OCT) is a non-invasive technique with a large array of applications in clinical imaging and biological tissue visualization. However, the presence of speckle noise affects the analysis of OCT images and their diagnostic utility. In this article, we introduce a new OCT denoising algorithm. The proposed method is founded on a numerical optimization framework based on maximum-a-posteriori estimate of the noise-free OCT image. It combines a novel ...
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    14. Multiple Scattering Model for Optical Coherence Tomography with Rytov Approximation (Thesis)

      Multiple Scattering Model for Optical Coherence Tomography with Rytov Approximation (Thesis)
      Optical Coherence Tomography (OCT) is a coherence-gated, micrometer-resolution imaging technique that focuses a broadband near-infrared laser beam to penetrate into optical scattering media, e.g. biological tissues. The OCT resolution is split into two parts, with the axial resolution defined by half the coherence length, and the depth-dependent lateral resolution determined by the beam geometry, which is well described by a Gaussian beam model. The depth dependence of lateral resolution ...
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    15. Feature of the Week 01/23/2017: In-Situ Biofouling Assessment in Spacer Filled Channels Using Optical Coherence Tomography - Biofilm Thickness Mapping

      Feature of the Week 01/23/2017: In-Situ Biofouling Assessment in Spacer Filled Channels Using Optical Coherence Tomography - Biofilm Thickness Mapping
      ...he biofilm behavior in aquatic system. For more information see recent Article . Courtesy Luca Fortunato from King Abdullah University of Science and Technology . Biofouling is a one of the major problem in membrane filt...
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  2. About King Abdullah University of Science and Technology

    King Abdullah University of Science and Technology

    King Abdullah University of Science and Technology (KAUST)  was founded in 2009 and focuses on graduate education and research, using English as the official language of instruction . It offers programs in Biological and Environmental Science and Engineering ; Computer, Electrical and Mathematical Science and Engineering ; and Physical Science and Engineering .