1. Articles from informaworld.com

  2. 1-6 of 6
    1. Structural changes of the retina after conventional laser photocoagulation and selective retina treatment (SRT) in spectral domain OCT.

      Background: Spectral domain optical coherence tomography (SD-OCT) in patients can deliver retinal cross-sectional images with high resolution. This may allow the evaluation of the extent of damage to the retinal pigment epithelium (RPE) and the neurosensory retina after laser treatment. This article aims to investigate the value of SD-OCT in comparing laser lesions produced by conventional laser photocoagulation and selective retina treatment (SRT). Material and Methods: In a retrospective study, conventional retinal laser (CRL) lesions and SRT laser lesions were evaluated with SD-OCT. One hundred seventy-five CRL lesions were investigated in 10 patients with diabetic maculopathy at timepoints between 1 ...

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    2. The Effect of Soft Contact Lenses During the Measurement of Retinal Nerve Fiber Layer Thickness Using Optical Coherence Tomography

      Purpose: To investigate if the measurement of retinal nerve fiber layer (RNFL) thickness using optical coherence tomography (OCT) is affected by soft contact lens wear. Methods: This prospective, observational, cross-sectional clinical study looked at 66 eyes in 66 patients who usually wear soft contact lenses everyday and 36 eyes in 36 patients who did not wear contact lenses during the 6 months prior to the study. No patients had pre-existing retinal or optic nerve pathology or other media opacities that might influence the RNFL thickness. All eyes were scanned using the fast RNFL program of the Stratus OCT with and ...

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    3. Determination of the coherency matrix of a broadband stochastic electromagnetic light beam

      Determination of the coherency matrix of a broadband stochastic electromagnetic light beam

      The statistical ensemble of a fluctuating, statistically-stationary electromagnetic light beam is presented in terms of a 2 2 matrix, so-called coherency matrix. The method to determine such matrix for a quasi-monochromatic light beam has been proposed for many years. In this paper, we demonstrate that the method needs to be only slightly modified to determine the matrix elements of a broadband stochastic electromagnetic light beam, if one uses the representation of statistical wave fields in the space-frequency domain. The implementation of the method is demonstrated, and the coherency matrix measurement is validated using a well-defined elliptically polarized beam.

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    4. Diagnosis of cholangiocarcinoma

      Diagnosis of cholangiocarcinoma

      Cholangiocarcinoma is suspected based on signs of biliary obstruction, abnormal liver function tests, elevated tumor markers (carbohydrate antigen 19-9 and carcinoembryonic antigen), and ultrasonography showing a bile stricture or a mass, especially in intrahepatic cholangiocarcinoma. Magnetic resonance imaging (MRI) or computed tomography (CT) is performed for the diagnosis and staging of cholangiocarcinomas. However, differentiation of an intraductal cholangiocarcinoma from a hypovascular metastasis is limited at imaging. Therefore, reasonable exclusion of an extrahepatic primary tumor should be performed. Differentiating between benign and malignant bile duct stricture is also difficult, except when metastases are observed. The sensitivity of fluorodeoxyglucose positron emission tomography ...

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    5. Optical Coherence Tomography for Classification and Clinical Evaluation of Macular Edema in Patients with Uveitis

      Purpose: To study use of optical coherence tomography (OCT) for macular edema in uveitis. Methods: In total, 44 patients with uveitis and macular edema underwent OCT. Data obtained were correlated with anatomic type, duration of uveitis, and visual acuity (VA). Results: Both cystoid macular edema (CME) and diffuse macular edema (DME) correlate negatively with VA, although statistically CME showed stronger correlation (p = .02). Also CME had higher mean foveal thickness than DME (p

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    6. Analysis of Macular Thickness in British Population Using Optical Coherence Tomography (oct): An Emphasis on Interocular Symmetry

      Purpose: To evaluate macular thickness measurements in normal subjects from British origin, to assess interocular asymmetry using optical coherence tomography (OCT) and to establish standard values for macular and foveal thickness. Methods: Two hundred eyes of 100 normal individuals underwent serial scans using fast macular thickness map protocol in the Stratus OCT version 3.51, with foveal fixation. Minimum foveal thickness (MFT), central 1 mm average foveal thickness (AFT), total foveal volume (TFV) and total macular volume (TMV at 6 mm) of both eyes were assessed. The interocular asymmetry was measured and statistically analyzed. Results: The mean ± SD (N = 200 ...

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    1-6 of 6
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