1. All Articles

    22681-22704 of 23981 « 1 2 ... 943 944 945 946 947 948 949 ... 998 999 1000 »
    1. Selective Removal of Natural Occlusal Caries by Coupling Near-infrared Imaging with a CO2 Laser

      You-Chen Tao and Daniel Fried Laser removal of dental hard tissue can be combined with optical, spectral or acoustic feedback systems to selectively ablate dental caries and restorative materials. Near-infrared (NIR) imaging has considerable potential for the optical discrimination of sound and demineralized tissue. Last year we ... [Proc. SPIE Int. Soc. Opt. Eng. 6843, 68430I (2008)] published Mon Feb 11, 2008.
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      Mentions: Daniel S. Fried
    2. Optical coherence tomography for endodontic imaging

      G. van Soest, H. Shemesh, M.-K. Wu et al. In root canal therapy, complications frequently arise as a result of root fracture or imperfect cleaning of fins and invaginations. To date, there is no imaging method for nondestructive in vivo evaluation of the condition of the root canal, during or after treatment. There is a clinical need for a ... [Proc. SPIE Int. Soc. Opt. Eng. 6843, 68430F (2008)] published Mon Feb 11, 2008.
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    3. Dynamic cure measurement of dental polymer composites using optical coherence tomography

      Peter H. Tomlins, Will M. Palin, and Adrian C. Shortall Dental amalgam is being increasingly replaced by Light-activated resin-based dental composites. However, these materials are limited by inefficient setting reactions as a function of depth, constraining the maximum extent of cure and reducing biocompatibility. In this paper we demonstrate a novel me ... [Proc. SPIE Int. Soc. Opt. Eng. 6843, 68430D (2008)] published Mon Feb 11, 2008.
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      Mentions: Pete H. Tomlins
    4. Slitlamp-Optical Coherence Tomography-Guided Needling of Failing Filtering Blebs

      Slitlamp–Optical Coherence Tomography–Guided Needling of Failing Filtering Blebs Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings. Slitlamp anterior segment optical coherence tomography (SL-OCT)^ (Heidelberg Engineering, Heidelberg, Germany) allows for direct^ imaging of filtering blebs after trabeculectomy and can be used^ to assess the internal anatomy and function of these blebs.^ Needling with subconjunctival injecti
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    5. Assessment of the Scleral Spur in Anterior Segment Optical Coherence Tomography Images

      Objective  To assess visibility of the scleral spur in anterior segment optical coherence tomography (AS-OCT) images. Methods  This cross-sectional observational study included 502 participants aged 50 years or older who had no previous ophthalmic problems and were recruited from a community clinic in Singapore. All participants underwent gonioscopy and AS-OCT (Visante; Carl Zeiss Meditec, Dublin, California). Scleral spur location was assessed in AS-OCT images by 2 examiners with glaucoma subspecialty training and was defined as the point where there was an inward protrusion of the sclera with a change in curvature of its inner surface. Results  Scleral spur location could ...
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    6. Use of optical coherence tomography to measure prevalence of epiretinal membranes in patients referred for cataract surgery.

      Related Articles [Use of optical coherence tomography to measure prevalence of epiretinal membranes in patients referred for cataract surgery.] Arch Soc Esp Oftalmol. 2008 Feb;83(2):89-94 Authors: Contreras I, Noval S, Tejedor J PURPOSE: To evaluate, using optical coherence tomography (OCT), the prevalence of epiretinal membranes (ERM) in patients referred for phacoemulsification, and the frequency of new ERM development in the first six months after surgery. METHODS: Patients referred by general ophthalmologists for cataract surgery underwent a new, complete ophthalmological evaluation. OCT scanning was performed using the Macular Thickness Map acquisition protocol (StratusOCT, Carl Zeiss Meditec). This baseline ...
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    7. Correlation Of Pathologic Features In Spectral Domain Optical Coherence Tomography With Conventional Retinal Studies.

      We delineated pathologic features within three-dimensional spectral domain optical coherence tomography volumes and projected marked sites of pathologic features onto clinically useful two-dimensional localization maps to be overlaid on conventional clinical images.Page: 298DOI: 10.1097/IAE.0b013e3181567798Authors: STOPA, MARCIN MD *+; BOWER, BRADLEY A. BSE +++; DAVIES, Emily BS *; IZATT, JOSEPH A. PhD *++; TOTH, CYNTHIA A. MD *++
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    8. Early Macular Morphological Changes Following Plaque Radiotherapy For Uveal Melanoma.

      Optical coherence tomography (OCT) evidence of radiation-induced macular edema can be found as early as 4 months following plaque radiotherapy of uveal melanoma. OCT changes are apparent before clinical signs of classical radiation maculopathy and before substantial visual deterioration occurs. The development of macular edema is significantly associated with larger initial tumor size.Page: 263DOI: 10.1097/IAE.0b013e31814b1b75Authors: HORGAN, NOEL MD; SHIELDS, CAROL L. MD; MASHAYEKHI, ARMAN MD; TEIXEIRA, LUIZ F. MD; MATERIN, MIGUEL A. MD; SHIELDS, JERRY A. MD
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    9. A biocompatible miniaturized package housing for a 3D micromirror-based optical bioprobe for OCT imaging application

      C. S. Premachandran, Ahmad Khairyanto, Kelvin Chen et al. A biocompatible housing for an optical bio-probe is developed for OCT (Optical Coherence Tomography) imaging application. Silicon micro machined 3D mirror is used to steer the optical beam in to the sample of interest. A Grin lens fiber assembly is used to couple the light from the light source to t ... [Proc. SPIE Int. Soc. Opt. Eng. 6887, 688708 (2008)] published Fri Feb 8, 2008.
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    10. Performance of a MEMS-based AO-OCT system

      Adaptive optics (AO) and optical coherence tomography (OCT) are powerful imaging modalities that, when combined, can provide high-resolution, 3-D images of the retina. The AO-OCT system at UC Davis has been under development for 2 years and has demonstrated the utility of this technology for microsc ... [Proc. SPIE Int. Soc. Opt. Eng. 6888, 68880G (2008)] published Fri Feb 8, 2008.
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    11. Compact MEMS-based adaptive optics: optical coherence tomography for clinical use

      We describe a compact MEMS-based adaptive optics (AO) optical coherence tomography (OCT) system with improved AO performance and ease of clinical use. A typical AO system consists of a Shack-Hartmann wavefront sensor and a deformable mirror that measures and corrects the ocular and system aberrations. Because of limitations on current deformable mirror technologies, the amount of real-time ocular-aberration compensation is restricted and small in previous AO-OCT instruments. In this instrument, we incorporate an optical apparatus to correct the spectacle aberrations of the patients such as myopia, hyperopia and astigmatism. This eliminates the tedious process of using trial lenses in clinical ...
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    12. Amplified Dispersive Optical Tomography.

      Amplified Dispersive Optical Tomography.

      Optical coherence tomography (OCT) has proven to be a powerful technique for studying tissue morphology in ophthalmology, cardiology, and endomicroscopy. Its performance is limited by the fundamental trade-off between the imaging sensitivity and acquisition speed -- a predicament common in virtually all imaging systems. In this paper, we circumvent this limit by using distributed Raman post-amplification of the reflection from the sample. We combine the amplification with simultaneously performed dispersive Fourier transformation, a process that maps the optical spectrum into an easily measured time-domain waveform. The Raman amplification enables measurement of weak signals which are otherwise buried in noise. It extends ...

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    13. Quantitative analysis on optical properties of human atherosclerosis by using polarization-sensitive optical coherence tomography

      Wen-Chuan Kuo, Ming-Wei Hsiung, Jeou-Jong Shyu et al. In this research, we have used an algorithm to extract four different optical parameters, including the scattering coefficient ([mu]), effective anisotropy factor (g), birefringence coefficient (Deltan), and fast-axis angle (beta) from polarization-sensitive optical coherence tomography (PS-OCT) ima ... [Proc. SPIE Int. Soc. Opt. Eng. 6842, 684223 (2008)] published Fri Feb 8, 2008.
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      Mentions: Wen-Chuan Kuo
    14. Significance of optical coherence tomography in the assessment of laryngeal lesions

      Optical coherence tomography (OCT) is a new promising imaging modality in laryngology as yet of undetermined value. The objective of the present study was to evaluate the ability of this noninvasive method to make a reliable prediction of diagnosis in laryngeal disease. In a prospective study, 225 b ... [Proc. SPIE Int. Soc. Opt. Eng. 6842, 68421O (2008)] published Fri Feb 8, 2008.
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    15. Anatomical optical coherence tomography: a safe and effective tool for quantitative long-term monitoring of upper airway size and shape

      J. J. Armstrong, S. Becker, R. A. McLaughlin et al. Anatomical optical coherence tomography (aOCT) is an endoscopic optical technique that enables continuous, quantitative assessment of hollow organ size and shape in three dimensions. It is a powerful alternative to X-ray computed tomography, magnetic resonance imaging, and video endoscopy for the as ... [Proc. SPIE Int. Soc. Opt. Eng. 6842, 68421N (2008)] published Fri Feb 8, 2008.
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    16. Optical coherence tomography as a guide for cochlear implant surgery?

      To assess the potential use of optical coherence tomography (OCT) in cochlear implant surgery, OCT was applied in human temporal bones before cochleostomy. The question was whether OCT might provide information about the cochlear topography, especially about the site of the scala tympani. OCT was ca ... [Proc. SPIE Int. Soc. Opt. Eng. 6842, 68421F (2008)] published Fri Feb 8, 2008.
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    17. The evaluation of the photoaging of the human skin by three-dimensional polarization sensitive spectral domain optical coherence tomography

      Arata Miyazawa, Shingo Sakai, Masayuki Matsumoto et al. Noninvasive evaluation of dermal degeneration is important for a diagnosis of photoaging. Polarization sensitive optical coherence tomography (PS-OCT) can measure the distribution of phase retardation caused by birefringence property of collagen. The PS-OCT has been reported as the technology of in ... [Proc. SPIE Int. Soc. Opt. Eng. 6842, 684207 (2008)] published Fri Feb 8, 2008.
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    18. Inherent homogenous media dispersion compensation in frequency domain optical coherence tomography by accurate k-sampling

      Alexandre R. Tumlinson, Bernd Hofer, Amy M. Winkler, Boris Považay, Wolfgang Drexler, Jennifer K. Barton. Depth dependent broadening of the axial point spread function due to dispersion in the imaged media, and algorithms for postprocess correction, have been previously described for both time domain and frequency domain optical coherence tomography. We show that homogeneous media dispersion artifacts ... [Appl. Opt. 47, 687-693 (2008)]
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    19. Effects of axial resolution improvement on optical coherence tomography (OCT) imaging of gastrointestinal tissues

      Effects of axial resolution improvement on optical coherence tomography (OCT) imaging of gastrointestinal tissues

      Yu Chen, Aaron D. Aguirre, Pei-Lin Hsiung, Shu-Wei Huang, Hiroshi Mashimo, Joseph M. Schmitt, James G. Fujimoto. Optical coherence tomography (OCT) is an emerging medical imaging technology which generates high resolution, cross-sectional images in situ, without the need for excisional biopsy. Previous clinical studies using endoscopic OCT with standard 10-15 μm axial resolution have demonstrated its ... [Opt. Express 16, 2469-2485 (2008)]

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    20. Optical coherence tomography findings in autosomal dominant macular dystrophy.

      Related Articles Optical coherence tomography findings in autosomal dominant macular dystrophy. Ophthalmic Surg Lasers Imaging. 2008 Jan-Feb;39(1):69-72 Authors: Schadlu R, Shah GK, Prasad AG The authors report a case of autosomal dominant cystoid macular dystrophy in which optical coherence tomography outlined the pathology and assisted in determining the etiology of the patient's macular edema. PMID: 18254357 [PubMed - in process]
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    21. OCT findings in macular hole formation in eyes with complete vitreofoveal separation.

      The current study describes the morphologic macular features in two eyes that developed full-thickness macular holes in the setting of documented vitreofoveal separation. Using third-generation optical coherence tomography, complete vitreofoveal separation associated with the disruption of the inner foveal retina was documented in both cases. Five months after presentation, decreased vision and epiretinal membrane formation associated with development of a full-thickness macular hole were observed in the first patient. In the second patient, a full-thickness macular hole was demonstrated by optical coherence tomography 6 weeks after presentation. These findings suggest that full-thickness macular holes may develop in eyes with vitreofoveal ...
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    22. Optical coherence tomography characteristics of epiretinal membranes in neurofibromatosis.

      Neurofibromatosis 2 is a neurocutaneous disorder that demonstrates unique ophthalmic manifestations. Several authors have noted a higher than expected incidence of epiretinal membranes in this population. In this brief case series, the authors document a series of optical coherence tomography (OCT) scans performed on three patients with neurofibromatosis 2 that demonstrated epiretinal membranes with atypical and distinctive characteristics. The membranes were unusually thick, with rolled edges extending into the vitreoretinal interface. The appearance of these membranes was distinct enough to establish a pattern. In one case, the unique OCT findings were the sole reason that the diagnosis of neurofibromatosis 2 ...

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    23. Parry-Romberg syndrome studied by optical coherence tomography.

      A case of Parry-Romberg syndrome that was studied by fluorescein angiography and optical coherence tomography (OCT) is described. OCT revealed the existence of retinal nerve fiber layer edema and abnormalities of the vitreoretinal interface. The presence of diffused retinal edema throughout the papillomacular area and the formation of thick retinal folds with intraretinal diffuse macular edema were also evident. Fluorescein angiography demonstrated optic disc swelling, engorgement of the retinal vessels, and mottling of the pigment epithelium. The retinal nerve fiber layer edema and the hyperreflectivity of the retinal surface indicate abnormalities and thickening of the vitreoretinal interface, as shown on ...
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