1. Articles in category: Dermatology

    1-24 of 524 1 2 3 4 ... 20 21 22 »
    1. On the horizon: Optical imaging for cutaneous squamous cell carcinoma

      On the horizon: Optical imaging for cutaneous squamous cell carcinoma

      Background : Surgical resection with negative margins remains the standard of care for high-risk cutaneous squamous cell carcinoma (cSCC). However, surgical management is often limited by poor intraoperative tumor visualization and inability to detect occult nodal metastasis. The inability to intraoperatively detect microscopic disease can lead to additional surgery, tumor recurrence, and decreased survival. Methods : A comprehensive literature review was conducted to identify studies incorporating optical imaging technology in the management of cSCC (1/1/2000-11/1/2014). Results : Several innovative optical imaging techniques, Raman spectroscopy, confocal microscopy, and fluorescence imaging, have been developed for intraoperative surgical guidance. Fifty-seven studies review ...

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    2. The sensitivity and specificity of optical coherence tomography for the assisted diagnosis of non-pigmented basal cell carcinoma - an observational study

      The sensitivity and specificity of optical coherence tomography for the assisted diagnosis of non-pigmented basal cell carcinoma - an observational study

      Background The diagnostic criteria for basal cell carcinoma (BCC) using optical coherence tomography (OCT) have been described previously, but the clinical value of these findings has been unknown. Objective The aim of this study was to investigate the diagnostic value of OCT for BCC in a typical clinical setting. The primary efficacy endpoint was a diagnosis of BCC for each lesion. Secondary endpoints were the diagnosis of other possible conditions. Methods This was an observational, prospective, multi-centre study in which consecutive patients with non-pigmented pink lesions suspicious for BCC underwent clinical assessment, dermoscopy, and OCT with the diagnosis recorded at ...

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    3. Taiwanese researchers find way to detect skin cancer early

      Taiwanese researchers find way to detect skin cancer early

      A research team at prestigious National Taiwan University (NTU) has developed a non-invasive technology that can help detect melanoma, the most deadly type of skin cancers, by up to six months earlier than usual. The team hopes its high-speed and high resolution optical coherence tomography scanner can receive medical certification by as early as 2017 so that it can put it into clinical use as soon as possible. Diagnosing cancer relies primarily on observing tissues and cells, and that is where the scanner can be useful in a timely way, said Shun Chia-tung, a doctor with National Taiwan University Hospital ...

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    4. Internal fingerprint acquisition from optical coherence tomography fingertip scans

      Internal fingerprint acquisition from optical coherence tomography fingertip scans

      Current surface fingerprint scanners measure the surface topography of skin, resulting in vulnerabilities to surface skin erosion, distortion due to contact with the scanner, and fingerprint counterfeiting. An improved means of fingerprint acquisition is necessitated in these facts. By employing an imaging technique known as Optical Coherence Tomography to the human fingertip skin, a three-dimensional digital reconstruction of subsurface layers of skin can be used for the extraction of an internal fingerprint. The internal fingerprint is robust towards counterfeiting, damage, and distortion, thus providing a replacement for the surface fingerprint. However, OCT scans are corrupted by speckle noise and have ...

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    5. Measuring skin aging using optical coherence tomography in vivo: a validation study

      Measuring skin aging using optical coherence tomography in vivo: a validation study

      Dermal and epidermal structures in human skin change during intrinsic and extrinsic aging. Epidermal thickness is one of the most often reported parameters for the assessment of skin aging in cross-sectional images captured by optical coherence tomography (OCT). We aimed to identify further parameters for the noninvasive measurement of skin aging of sun-exposed and sun-protected areas utilizing OCT. Based on a literature review, seven parameters were inductively developed. Three independent raters assessed these parameters using four-point scales on images of female subjects of two age groups. All items could be detected and quantified in our sample. Interrater agreement ranged between ...

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    6. Internal fingerprint zone detection in optical coherence tomography fingertip scans

      Internal fingerprint zone detection in optical coherence tomography fingertip scans

      Optical coherence tomography (OCT) is a high-resolution imaging technology capable of capturing a three-dimensional (3-D) representation of fingertip skin. The papillary junction—a junction layer of skin containing the same topographical features as the surface fingerprint—is contained within this representation. The top edge of the papillary junction contains the topographical information pertinent to the internal fingerprint. Extracting the internal fingerprint from OCT fingertip scans has been shown to be possible. Currently, acquiring the internal fingerprint involves manually defining the region containing it. This manner of definition is inefficient. Perfect knowledge of the location of the papillary junction is hypothesized ...

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    7. Michelson Diagnostics Appoints Peter Senger as Country Manager Germany

      Michelson Diagnostics Appoints Peter Senger as  Country Manager Germany

      Michelson Diagnostics, the UK based medical device company focused on multi-beam Optical Coherence Tomography (‘OCT’) technology, today announces the appointment of Peter Senger as Country Manager Germany, with immediate effect. Peter, aged 46, has more than 25 years’ experience in sales and marketing and over 15 years of commercial experience in the medical device industry in Germany, with a track record of building early stage businesses with new and disruptive technologies. Most recently, Peter was Regional Business Manager at AngioDynamics, where he was instrumental in the introduction of the NanoKnife ® System into Germany and helped to secure reimbursement for the ...

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    8. Functional optical coherence tomography of pigmented lesions

      Functional optical coherence tomography of pigmented lesions

      Background Cutaneous melanomas are diagnosed worldwide in 231 130 patients per year. The sensitivity and specificity of melanoma diagnosis expresses the need for an additional diagnostic method. Optical coherence tomography (OCT) has shown that it allows morphological (qualitative) description of image features and quantitative analysis of pathology related light scattering by means of the attenuation coefficient (μ oct ). Objective We hypothesize that OCT images of nevi will differ qualitatively and quantitatively from melanomas. Methods Forty lesions from 33 consecutive patients were imaged with OCT. After data acquisition, excision was performed. Epidermal layer thickness was measured and values of μ oct were extracted ...

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    9. Vertically Integrated Array-type Mirau-based OCT System for early detection of skin pathologies

      Vertically Integrated Array-type Mirau-based OCT System for early detection of skin pathologies

      VIAMOS proposes an OCT microsystem able to revolutionize the field of microscopes for dermatology imaging. The aim of the project is to develop a new generation of Optical Coherence Tomography micro-system in order to help the diagnosis of skin pathologies thanks to a three dimensional image. The challenge is to provide a hand-held, low-cost and fully parallel spectral domain OCT micro-device. The consequence is a significant upgrade by adding new features such as heterodyne detection and integrated swept source. The project leans on the experience of 8 highly recognized European research institutes and companies such as the FEMTO-ST, University of ...

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    10. Advances in non-invasive techniques as aids to the diagnosis and monitoring of therapeutic response in plaque psoriasis: a review

      Advances in non-invasive techniques as aids to the diagnosis and monitoring of therapeutic response in plaque psoriasis: a review

      Plaque psoriasis is a common, chronic, inflammatory disease with a multifactorial etiopathogenesis. Although its diagnosis is often based on clinical features, in ambiguous cases a biopsy with histopathologic confirmation may be necessary. Advanced high-definition imaging techniques may be useful in the study of skin properties in vivo and may facilitate therapeutic monitoring. Available imaging tools vary in their resolution, depth of penetration and visual representation (horizontal, vertical, three-dimensional), and in the type of skin structures visualized. The purpose of this review is to analyze a variety of non-invasive techniques that may assist in establishing definitive diagnoses, as well as in ...

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    11. Improvement of Transdermal Delivery of Sumatriptan Succinate Using a Novel Self-dissolving Microneedle Array Fabricated from Sodium Hyaluronate in Rats

      Improvement of Transdermal Delivery of Sumatriptan Succinate Using a Novel Self-dissolving Microneedle Array Fabricated from Sodium Hyaluronate in Rats

      The purpose of the present study was to develop an alternative transdermal formulation containing sumatriptan succinate (SS) for the treatment of migraine. Novel self-dissolving SS-loaded microneedle arrays (MNs) were fabricated from sodium hyaluronate and their efficacy for transdermal delivery of SS was characterized. The resulting MNs maintained their skin piercing abilities for at least 30 min after being placed at a high relative humidity of 75%. Rapid release of SS from the MNs was also observed in vitro . Optical coherence tomography images demonstrated that MNs were able to successfully pierce into rat skin without any bending or cracking, and needles ...

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    12. Non-invasive diagnosis of sweat gland dysplasia using optical coherence tomography and reflectance confocal microscopy in a family with anhidrotic ectodermal dysplasia (Christ-Siemens-Touraine syndrome

      Non-invasive diagnosis of sweat gland dysplasia using optical coherence tomography and reflectance confocal microscopy in a family with anhidrotic ectodermal dysplasia (Christ-Siemens-Touraine syndrome

      Background Anhidrotic ectodermal dysplasia (AED) is an inherited syndrome, which originates mainly from genetic alteration of the ectodysplasin A (EDA) gene. It regularly affects the adnexa of the skin which results in a characteristic phenotype of the patients including hypo- or anhidrosis leading to severe disturbances in the regulation of body temperature. Objectives To prevent the development of the symptoms in early childhood promising therapeutic approaches are currently under clinical investigation. In this context, timely diagnosis of this genetic syndrome is crucial. The purpose of our study was the investigation of modern non-invasive imaging methods such as optical coherence tomography ...

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    13. In Vivo Imaging of Miliaria Profunda Using High-Definition Optical Coherence Tomography Diagnosis, Pathogenesis, and Treatment

      In Vivo Imaging of Miliaria Profunda Using High-Definition Optical Coherence Tomography Diagnosis, Pathogenesis, and Treatment

      Miliaria profunda (MP) is a condition of sweat duct obstruction manifesting with generalized papular eruption and anhidrosis. 1 , 2 Using imaging with high-definition optical coherence tomography (HD-OCT), we identified, in vivo, the depth of lesions in MP and the likely location of sweat duct obstruction. To our knowledge, this is the first time such an evaluation has been performed.

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    14. Precise measurement of volume of eccrine sweat gland in mental sweating by optical coherence tomography

      Precise measurement of volume of eccrine sweat gland in mental sweating by optical coherence tomography

      We have demonstrated dynamic analysis of the physiological function of eccrine sweat glands underneath skin surface by optical coherence tomography (OCT). In this paper, we propose a method for extraction of the specific eccrine sweat gland by means of the connected component extraction process and the adaptive threshold method, where the en face OCT images are constructed by the swept-source OCT. In the experiment, we demonstrate precise measurement of the volume of the sweat gland in response to the external stimulus.

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    15. Morphology of human sweat ducts observed by optical coherence tomography and their frequency of resonance in the terahertz frequency region

      Morphology of human sweat ducts observed by optical coherence tomography and their frequency of resonance in the terahertz frequency region

      It is crucial to understand the various biological effects induced by terahertz (THz) electromagnetic waves with the rapid development of electronic and photonic devices operating in the THz frequency region. The presence of sweat glands plays an important role in THz wave interactions with human skin. We investigated the morphological features of sweat ducts using optical coherence tomography (OCT) to further understand such phenomena. We observed remarkable features of the ducts, such as their clear helical structure. The intersubject and intrasubject variations in the diameter of sweat ducts were considerably smaller than the variations in other structural parameters, such as ...

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    16. Quantitative and rapid estimations of human sub-surface skin mass using ultra-high-resolution spectral domain optical coherence tomography

      Quantitative and rapid estimations of human sub-surface skin mass using ultra-high-resolution spectral domain optical coherence tomography

      In vivo optical coherence tomography (OCT) image of angioma (A). Thin red arrows point to a blood vessel (BV). Non-invasive and quantitative estimations for the delineation of sub-surface tumor margins could greatly aid in the early detection and monitoring of the morphological appearances of tumor growth, ensure complete tumor excision without the unnecessary sacrifice of healthy tissue, and facilitate post-operative follow-up for recurrence. In this study, a high-speed, non-invasive, and ultra-high-resolution spectral domain optical coherence tomography (UHR-SDOCT) imaging platform was developed for the quantitative measurement of human sub-surface skin mass. With a proposed robust, semi-automatic analysis, the system can rapidly ...

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    17. Optical coherence tomography for planning of follicular unit extraction

      Optical coherence tomography for planning of follicular unit extraction

      BACKGROUND: As the subcutaneous course of the hair follicle cannot be extrapolated from the angle of hair emergence, the follicular unit extraction (FUE) method bears the risk of follicle transsection potentially affecting the success of the whole intervention. Histological examination can provide this angle information but are too time consuming and invasive to be integrated in the workflow. OBJECTIVE: In this work, the authors present an effective and noninvasive way to determine these subcutaneous follicle angles. METHODS AND MATERIALS: For this purpose, the authors use optical coherence tomography to provide images of the first 2 to 3 mm of the ...

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    18. High resolution imaging of acne lesion development and scarring in human facial skin using OCT-based microangiography

      High resolution imaging of acne lesion development and scarring in human facial skin using OCT-based microangiography

      Background and Objective Acne is a common skin disease that often leads to scarring. Collagen and other tissue damage from the inflammation of acne give rise to permanent skin texture and microvascular changes. In this study, we demonstrate the capabilities of optical coherence tomography-based microangiography in detecting high-resolution, three-dimensional structural, and microvascular features of in vivo human facial skin during acne lesion initiation and scar development. Materials and Methods A real time swept source optical coherence tomography system is used in this study to acquire volumetric images of human skin. The system operates on a central wavelength of 1,310 ...

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    19. In Vivo High-Definition Optical Coherence Tomography: A Bedside Diagnostic Aid for Morphea

      In Vivo High-Definition Optical Coherence Tomography: A Bedside Diagnostic Aid for Morphea

      Optical coherence tomography (OCT) is a noninvasive imaging technique that allows real-time high-definition cross-sectional visualization of tissues. Conventional OCT was introduced in dermatology in 1997 and has shown benefit in evaluating malignant neoplasms and inflammatory skin disorders. 1 , 2 High-definition OCT (HD-OCT) scanners have recently been developed; they provide a higher resolution than conventional OCT and horizontal, in additional to vertical, sectional imaging, which conventional OCT does not provide.

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    20. High-definition optical coherence tomography algorithm for discrimination of basal cell carcinoma from clinical BCC imitators and differentiation between common subtypes

      High-definition optical coherence tomography algorithm for discrimination of basal cell carcinoma from clinical BCC imitators and differentiation between common subtypes

      Background Preliminary studies have described morphological features of basal cell carcinoma (BCC) imaged by high-definition optical coherence tomography (HD-OCT) and suggested that this technique may aid in its diagnosis and management. However, systematic studies evaluating the accuracy of HD-OCT for the diagnosis of BCC are lacking. Objective The aim of this study was to identify three-dimensional (3-D) HD-OCT features able i) to distinguish BCC from clinical BCC imitators and ii) to discriminate between the most common BCC subtypes. Based on these particular features, a diagnostic algorithm will be suggested. Method A total of 50 histopathologically confirmed BCCs (18 superficial, 19 ...

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    21. VivoSightOCT Education Centre

      VivoSightOCT Education Centre

      Welcome to the VivoSight OCT Education Centre website This is an open access facility providing information about the use of Optical Coherence Tomography in Dermatology. Please feel free to browse using the navigation guides, We hope you will find the site useful. If you would like to contribute images or just give us some feedback please contact us on info@vivosightatlas.com

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    22. Recellularising of human acellular dermal matrices imaged by high-definition optical coherence tomography

      Recellularising of human acellular dermal matrices imaged by high-definition optical coherence tomography

      Background High-definition optical coherence tomography (HD-OCT) permits real-time 3-D imaging of the impact of selected agents on human skin allografts. Objective The real-time 3-D HD-OCT assessment of i) the impact on morphological and cellular characteristics of the processing of human acellular dermal matrices (HADMs) and ii) repopulation of HADMs in vitro by human fibroblasts and remodelling of the extracellular matrix by these cells. Method Four different skin decellularisation methods, Dispase II/Triton X-100, Dispase II/SDS (sodium dodecyl sulphate), NaCl/Triton X-100 and NaCl/SDS, were analyzed by HD-OCT. HD-OCT features of epidermal removal, dermo-epidermal junction (DEJ) integrity, cellularity and ...

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    1-24 of 524 1 2 3 4 ... 20 21 22 »
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