1. Articles in category: Dermatology

    1-24 of 829 1 2 3 4 ... 33 34 35 »
    1. (Cost)-Effectiveness of OCT in BCC (ROCTI)

      (Cost)-Effectiveness of OCT in BCC (ROCTI)

      Skin cancer incidence rises worldwide due to high sun exposure and ageing. Basal cell carcinoma (BCC) is the most prevalent form, with a lifetime risk of 16-20% in the Netherlands. Currently, the gold standard for diagnosing and subtyping basal cell carcinoma (BCC) is a punch biopsy. Since this technique is invasive, new non-invasive diagnostic methods have been developed, including optical coherence tomography (OCT). In patients with clinical and dermoscopic suspicion of BCC, OCT makes it possible to confirm and subtype BCC with high confidence, thereby obviating the need for a punch biopsy in a substantial part of patients. Hence, BCC ...

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    2. Microvascular imaging of the skin

      Microvascular imaging of the skin

      Despite our understanding that the microvasculature plays a multifaceted role in the development and progression of various conditions, we know little about the extent of this involvement. A need exists for non-invasive, clinically meaningful imaging modalities capable of elucidating microvascular information to aid in our understanding of disease, and to aid in the diagnosis/monitoring of disease for more patient-specific care. In this review article, a number of imaging techniques are summarized that have been utilized to investigate the microvasculature of skin, along with their advantages, disadvantages and future perspectives in preclinical and clinical settings. These techniques include dermoscopy, capillaroscopy ...

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    3. Optical coherence tomography array based subdermal imaging device

      Optical coherence tomography array based subdermal imaging device

      The invention teaches a multiple reference optical coherence tomography scanner that provides a subdermal fingerprint scan, covers an area of approximately 16 mm-17 mm.times.10 mm in less than a second, and fits into a slim profile of less than 6 mm in thickness, thereby fitting within the slim consumer electronics such as the iPhone and similar consumer electronics. Various embodiments are taught.

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    4. Non‐invasive monitoring of subclinical and clinical actinic keratosis of face and scalp under topical treatment with ingenolmebutate gel 150 mcg/gby means of reflectance confocal microscopy and optical coherence tomography: new perspectives and comparison

      Non‐invasive monitoring of subclinical and clinical actinic keratosis of face and scalp under topical treatment with ingenolmebutate gel 150 mcg/gby means of reflectance confocal microscopy and optical coherence tomography: new perspectives and comparison

      Actinic keratosis (AKs) corresponds to the earliest stage of in‐situ squamous cell carcinoma and arises on chronically sun‐exposed skin. Around the clinically evident AKs, the apparently healthy epidermis may contain different grades of atypia that can be detected by non‐invasive imaging techniques such as reflectance confocal microscopy (RCM) and optical coherence tomography (OCT). Subclinical actinic keratosis (sAKs) have captured increasing interest as a potential target of field therapies. The aim of this study was to evaluate in vivo the changes in the field cancerization undergoing treatment with topical ingenolmebutate by combining RCM and OCT. Twenty patients with ...

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    5. Microneedle fractional radiofrequency‐induced micropores evaluated by in vivo reflectance confocal microscopy, optical coherence tomography, and histology

      Microneedle fractional radiofrequency‐induced micropores evaluated by in vivo reflectance confocal microscopy, optical coherence tomography, and histology

      Background Microneedle fractional radiofrequency (MNRF) is a minimally invasive technique that delivers radiofrequency (RF) energy into the skin via microneedles. Reflectance confocal microscopy (RCM) and optical coherence tomography (OCT) enable the characterization of device‐tissue interactions in in vivo skin. The aim of this study is to describe MNRF‐induced micropores using RCM and OCT imaging. Materials and methods Five healthy participants were treated with a 7 × 7 array of 1500 μm microneedles on two adjacent areas of the right hip. One area received MNRF using high RF energy while the other underwent MNRF at low RF energy. Micropore morphology ...

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    6. Simultaneous dual-band line-field confocal optical coherence tomography: application to skin imaging

      Simultaneous dual-band line-field confocal optical coherence tomography: application to skin imaging

      Line-field confocal optical coherence tomography (LC-OCT) operating in two distinct spectral bands centered at 770 nm and 1250 nm is reported, using a single supercontinuum light source and two different line-scan cameras. B-scans are acquired simultaneously in the two bands at 4 frames per second. Greyscale representation and color fusion of the images are performed to either produce a single image with both high resolution (1.3 µm × 1.2 µm, lateral × axial, measured at the surface) in the superficial part of the image and deep penetration, or to highlight the spectroscopic properties of the sample. In vivo images of ...

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      Mentions: Arnaud Dubois
    7. Dynamic Optical Coherence Tomography Is a New Technique for Imaging Skin Around Lower Extremity Wounds

      Dynamic Optical Coherence Tomography Is a New Technique for Imaging Skin Around Lower Extremity Wounds

      Chronic wounds such as venous leg ulcers invariably heal slowly and recur. In the case of venous leg ulcers, poor healing of chronic wounds is variously attributed to ambulatory hypertension, impaired perfusion and diffusion, presence of chronic inflammation at wound sites, lipodermatosclerosis, and senescence. The aim of this study was to investigate whether a new technique, optical coherence tomography (OCT), which permits imaging of blood capillaries in the peri-wound skin, can provide new insights into the pathology. OCT and its recent variant, dynamic OCT, permit rapid noninvasive depth-resolved imaging of the capillaries in the superficial dermis via a handheld probe ...

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    8. Short-time series optical coherence tomography angiography and its application to cutaneous microvasculature

      Short-time series optical coherence tomography angiography and its application to cutaneous microvasculature

      We present a new optical coherence tomography (OCT) angiography method for imaging tissue microvasculature in vivo based on the characteristic frequency-domain flow signature in a short time series of a single voxel. The angiography signal is generated by Fourier transforming the OCT signal time series from a given voxel in multiple acquisitions and computing the average magnitude of non-zero (high-pass) frequency components. Larger temporal variations of the OCT signal caused by blood flow result in higher values of the average magnitude in the frequency domain compared to those from static tissue. Weighting of the signal by the inverse of the ...

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    9. A Case Series of Bowen’s Disease Treated with the Combination of Cryosurgery and Ingenol Mebutate and Followed Up with Optical Coherence Tomography

      A Case Series of Bowen’s Disease Treated with the Combination of Cryosurgery and Ingenol Mebutate and Followed Up with Optical Coherence Tomography

      Bowen’s disease (BD) is a relatively rare in situ squamous cell carcinoma (SCC) with a limited potential of becoming invasive. Ingenol mebutate (IM) was relatively successful for the treatment of BD lesions in small case series. Optical coherence tomography (OCT) is a promising method for the diagnosis of cutaneous keratinocytic carcinomas, including BD. Herein we report the treatment of BD with the combination of cryosurgery and IM and the application of OCT imagining in treatment monitoring. Patients treated within a period of 12 months are retrospectively compiled. Treatment consisted of a mild cryosurgery session (liquid N 2 , open spray ...

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    10. Optical coherence tomography angiography and photoacoustic imaging in dermatology

      Optical coherence tomography angiography and photoacoustic imaging in dermatology

      Optical coherence tomography angiography (OCTA) is a relatively novel functional extension of the widely accepted ophthalmic imaging tool named optical coherence tomography (OCT). Since OCTA’s debut in ophthalmology, researchers have also been trying to expand its translational application into dermatology. The ability of OCTA in resolving microvasculature has shown promising results in imaging skin diseases. Meanwhile, photoacoustic imaging (PAI), which uses laser pulse induced ultrasound waves as the signal, has been studied to differentiate human skin layers and to help skin disease diagnosis. This perspective article gives a short review of OCTA and PAI in the field of photodermatology ...

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    11. Optical coherence tomography imaging of melanoma skin cancer

      Optical coherence tomography imaging of melanoma skin cancer

      No consensus guidelines exist on the use of optical coherence tomography (OCT) for diagnosis of cutaneous melanoma. The objectives of this review are to provide a descriptive review of the literature on characteristics of cutaneous melanomas seen on high-definition OCT (HD-OCT), speckle variance OCT (SV-OCT), and conventional OCT and to compare their diagnostic ability with that of histopathology. A review of PubMed and Google Scholar identified all available literature on OCT in melanoma skin cancer that included all in vivo and ex vivo studies on human or human tissues and excluded all studies on non-human subjects or animal studies. Two ...

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    12. Dynamic Optical Coherence Tomography(D-OCT) Aging Study: A Preliminary Evaluation of Structural Differences Between Young and Aged Skin, Cellulite and Atrophic Acne Scars in Female Caucasian Subjects With Fitzpatrick Skin Types I-III Utilizing Non-invasiv

      Dynamic Optical Coherence Tomography(D-OCT) Aging Study: A Preliminary Evaluation of Structural Differences Between Young and Aged Skin, Cellulite and Atrophic Acne Scars in Female Caucasian Subjects With Fitzpatrick Skin Types I-III Utilizing Non-invasiv

      This single-center clinical study is being conducted over the course of 2 weeks to conduct an exploratory pilot study as a preliminary evaluation of D-OCT's ability to measure skin changes from aging. Assess structural differences between young and aged skin on the face. To identify the structural characteristics of atrophic acne scars relative to normal skin on the face. To explore characteristics of cellulite relative to normal skin on the thigh in young and aged skin.

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    13. OCT links blood vessels to melanoma type

      OCT links blood vessels to melanoma type

      A clinical study of malignant melanoma suggests that optical imaging of the most aggressive form of skin cancer could yield a faster assessment of particularly dangerous tumors. According to the UK-based optical coherence tomography (OCT) hardware developer Michelson Diagnostics , whose equipment was used in the study by four European dermatology research groups, the technique could offer a “short-cut” to identifying advanced cancers that have begun to spread. That might provide patients with a more aggressive or advanced tumor access to appropriate treatment more quickly, while those with less virulent melanomas could be spared invasive and expensive sentinel lymph-node biopsies that ...

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    14. Michelson Diagnostics: Imaging Reveals Changes in Blood Vessel Growth in Deadly Melanoma Skin Cance

      Michelson Diagnostics: Imaging Reveals Changes in Blood Vessel Growth in Deadly Melanoma Skin Cance

      A new clinical study has shown that Dynamic Optical Coherence Tomography imaging of melanomas (D-OCT) reveals changes to the blood vessels that correlate with the depth of invasion of the melanoma. Researchers believe this could lead to a new faster method of rapidly assessing how dangerous a given melanoma is. A more rapid assessment of the risk would potentially allow patients with more serious invasive disease access to the right treatment more directly, doing away with delays inherent in the traditional diagnosis. The technique may also lead to reducing the number of patients with less aggressive tumours receiving sentinel lymph ...

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    15. Usefulness of Optical Coherence Tomography in the Preoperative Assessment of Nail Deformities

      Usefulness of Optical Coherence Tomography in the Preoperative Assessment of Nail Deformities

      Secondary nail deformities are often seen at some time after fingertip and nail bed injuries. A proper evaluation of the fingernail enables appropriate diagnosis and treatment, especially in patients who need surgical management. To date, ultrasound and magnetic resonance imaging are the only diagnostic tools that most surgeons use in cases of nail deformities. Herein, we report the case of a patient with a nail deformity who underwent successful correction based on the preoperative use of real-time optical coherence tomography.

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    16. Classification of burn injury using Raman spectroscopy and optical coherence tomography: An ex-vivo study on porcine skin

      Classification of burn injury using Raman spectroscopy and optical coherence tomography: An ex-vivo study on porcine skin

      Accurate depth assessment of burn wounds is a critical task to provide the right treatment and care. Currently, laser Doppler imaging is able to provide better accuracy compared to the standard clinical evaluation. However, its clinical applicability is limited by factors like scanning distance, time, and cost. Precise diagnosis of burns requires adequate structural and functional details. In this work, we evaluated the combined potential of two non-invasive optical modalities, optical coherence tomography (OCT) and Raman spectroscopy (RS), to identify degrees of burn wounds (superficial partial-thickness (SPT), deep partial-thickness (DPT), and full-thickness (FT)). OCT provides morphological information, whereas, RS provides ...

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    17. Handheld Skin Quality Optical Coherence Tomography

      Handheld Skin Quality Optical Coherence Tomography

      ITRI’s Handheld Skin Quality Optical Coherence Tomography (HSQ-OCT) is the first to provide real-time, non-invasive, easily operated, objective evaluation of skin quality. It is the first handheld OCT system scientifically proven capable of visualizing subsurface skin structures and detecting collagen distribution in the dermis layer. This technology makes it possible to conduct automatic and objective evaluation of skin quality, revealing the effects of skincare products and providing reliable scientific evidence for testing. Further, it reduces the need to sacrifice experimental animals for cosmetic product development.

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    18. Line-field confocal optical coherence tomography for high-resolution noninvasive imaging of skin tumors

      Line-field confocal optical coherence tomography for high-resolution noninvasive imaging of skin tumors

      An optical technique called line-field confocal optical coherence tomography (LC-OCT) is introduced for high-resolution, noninvasive imaging of human skin in vivo . LC-OCT combines the principles of time-domain optical coherence tomography and confocal microscopy with line illumination and detection using a broadband laser and a line-scan camera. LC-OCT measures the echo-time delay and amplitude of light backscattered from cutaneous microstructures through low-coherence interferometry associated with confocal spatial filtering. Multiple A-scans are acquired simultaneously while dynamically adjusting the focus. The resulting cross-sectional B-scan image is produced in real time at 10  frame  /  s. With an isotropic spatial resolution of ∼1  μm, the ...

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    19. A review of non‐invasive imaging in extramammary Paget's disease

      A review of non‐invasive imaging in extramammary Paget's disease

      Extramammary Paget's Disease (EMPD) is a rare intraepithelial adenocarcinoma that classically manifests with pruritic, erythematous and scaling plaques. The clinical picture frequently mimics inflammatory or infectious conditions and is thus commonly misdiagnosed. The assessment of tumour margins is equally challenging as tumours have a propensity to spread beyond clinically visible boundaries. Appropriate non‐invasive diagnostic tools can assist in the early detection, diagnosis and management of EMPD. This paper will review the literature on non‐invasive imaging modalities used in EMPD. Articles from the PubMed database were selected based on relevance to the topic of this review. Articles that ...

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    20. Inherited epidermolysis bullosa: description of clinical and subclinical morphological features with optical coherence tomography

      Inherited epidermolysis bullosa: description of clinical and subclinical morphological features with optical coherence tomography

      Epidermolysis bullosa (EB) is an inherited skin disorder characterized by exacerbated skin and/or mucosal fragility and blister formation following minor mechanical trauma. Great scientific interest has recently been focused on gene therapies and transgenic epidermal grafting in EB patients. 1 Depending on the level of cleavage in the skin, EB is classified into 4 types: simplex (EBS), junctional (JEB), and dystrophic (DEB), and the extremely rare Kindler syndrome

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    21. Optical coherence tomography provides an optical biopsy of burn wounds in children—a pilot study

      Optical coherence tomography provides an optical biopsy of burn wounds in children—a pilot study

      Thermic injuries are among the most severe injuries in childhood. Burn depth is the most relevant prognostic factor, and still its assessment is both difficult and controversial. This diagnostic uncertainty results in repeated wound assessments over a 10-day period and carries a relevant risk for over- and undertreatment. Precise wound assessment would thus be a significant step toward improved care. Optical coherence tomography (OCT) is a noninvasive laser-based technique with a penetration depth of ∼2  mm. It provides structural images of the skin while dynamic OCT (D-OCT) shows blood vessels. In this study, we investigated burns and scalds in 130 ...

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    22. Preclinical quantitative in-vivo assessment of skin tissue vascularity in radiation-induced fibrosis with optical coherence tomography

      Preclinical quantitative in-vivo assessment of skin tissue vascularity in radiation-induced fibrosis with optical coherence tomography

      Radiation therapy (RT) is widely and effectively used for cancer treatment but can also cause deleterious side effects, such as a late-toxicity complication called radiation-induced fibrosis (RIF). Accurate diagnosis of RIF requires analysis of histological sections to assess extracellular matrix infiltration. This is invasive, prone to sampling limitations, and thus rarely used; instead, current practice relies on subjective clinical surrogates, including visual observation, palpation, and patient symptomatology questionnaires. This preclinical study demonstrates that functional optical coherence tomography (OCT) is a useful tool for objective noninvasive in-vivo assessment and quantification of fibrosis-associated microvascular changes in tissue. Data were collected from murine ...

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    23. Quantitative evaluation of skin surface roughness using optical coherence tomography in vivo

      Quantitative evaluation of skin surface roughness using optical coherence tomography in vivo

      The quantitative monitoring of skin topography is important in the field of cosmetics and dermatology. The most widespread method for determining skin roughness in vivo is to use skin microrelief, PRIMOS device, which allows a noninvasive, fast and direct measurement of the skin surface. However, it has drawbacks, such as the interference of backscattering from volumetric skin and motion artifacts. In this study, we demonstrate the potential of OCT for providing reliable and quantitative skin surface roughness. In order to evaluate the performance of OCT for skin surface analysis, different types of skin phantoms were fabricated and measured. We utilized ...

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    1-24 of 829 1 2 3 4 ... 33 34 35 »
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