1. 1-24 of 1461 1 2 3 4 ... 59 60 61 »
    1. Comparison of reflectance confocal microscopy and line-field optical coherence tomography for the identification of keratinocyte skin tumours

      Comparison of reflectance confocal microscopy and line-field optical coherence tomography for the identification of keratinocyte skin tumours

      Background: Reflectance confocal microscopy (RCM) and line-field confocal optical coherence tomography (LC-OCT) are non-invasive imaging devices that can help in the clinical diagnosis of actinic keratosis (AK) and cutaneous squamous cell carcinoma (SCC). No studies are available on the comparison between these two technologies for the identification of the different features of keratinocyte skin tumours. Objectives: To compare RCM and LC-OCT findings in AK and SCC. Methods: A retrospective multicenter study was conducted. Tumours were imaged with RCM and LC-OCT devices before surgery, and the diagnosis was confirmed by histological examinations. LC-OCT and RCM criteria for AK/SCC were identified ...

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    2. High sampling resolution optical coherence tomography reveals potential concurrent reductions in ganglion cell-inner plexiform and inner nuclear layer thickness but not in outer retinal thickness in glaucoma

      High sampling resolution optical coherence tomography reveals potential concurrent reductions in ganglion cell-inner plexiform and inner nuclear layer thickness but not in outer retinal thickness in glaucoma

      Purpose: To analyse optical coherence tomography (OCT)-derived inner nuclear layer (INL) and outer retinal complex (ORC) measurements relative to ganglion cell-inner plexiform layer (GCIPL) measurements in glaucoma. Methods: Glaucoma participants (n = 271) were categorised by 10-2 visual field defect type. Differences in GCIPL, INL and ORC thickness were calculated between glaucoma and matched healthy eyes (n = 548). Hierarchical cluster algorithms were applied to generate topographic patterns of retinal thickness change, with agreement between layers assessed using Cohen's kappa (κ). Differences in GCIPL, INL and ORC thickness within and outside GCIPL regions showing the greatest reductions and Spearman's correlations ...

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    3. Multimodality imaging results of TAP versus novel modified TAP stenting in coronary bifurcation

      Multimodality imaging results of TAP versus novel modified TAP stenting in coronary bifurcation

      Objectives: We investigated the results of T and small protrusion (TAP) versus a novel modification of TAP (mTAP) stenting by multimodality imaging in bench testing and in patients with coronary bifurcation lesions (CBL). Background: TAP stenting is a suboptimal technique for bailout side branch (SB) stenting. Methods: In a bench model, optical coherence tomography (OCT), microscopic examinations (ME), and computational fluid dynamics (CFD) were performed after TAP and mTAP stenting. In 20 patients with CBL, 80 intravascular ultrasound (IVUS) examinations were performed during mTAP stenting in which the SB stent was pulled-back to indent the inflated main vessel (MV) balloon ...

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    4. Skin aging: clinical aspects and in vivo microscopic patterns observed with reflectance confocal microscopy and optical coherence tomography

      Skin aging: clinical aspects and in vivo microscopic patterns observed with reflectance confocal microscopy and optical coherence tomography

      Background: Few studies have combined high-resolution, non-invasive imaging, such as standardized clinical images, Reflectance Confocal Microscopy (RCM) and Optical Coherence Tomography (OCT), for age-related skin change characterization according to age groups. Objective: To correlate clinical manifestations of aging with skin cytoarchitectural background observed with high-resolution, non-invasive imaging according to age-related skin pattern distribution. Methods: A set of 140 non-pathological facial skin images were retrospectively retrieved from a research database. Subjects, aged between 20-89, were divided into 7 age groups. Clinical features were explored with VISIA, including hyperpigmentation, skin texture, wrinkles, pores and red areas, quantified and expressed as automated absolute ...

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    5. Effectual Accuracy of OCT Image Retinal Segmentation with the Aid of Speckle Noise Reduction and Boundary Edge Detection Strategy

      Effectual Accuracy of OCT Image Retinal Segmentation with the Aid of Speckle Noise Reduction and Boundary Edge Detection Strategy

      Optical coherence tomography (OCT) has shown to be a valuable imaging tool in the field of ophthalmology, and it is becoming increasingly relevant in the field of neurology. Several OCT image segmentation methods have been developed previously to segment retinal images, however sophisticated speckle noises with low-intensity restrictions, complex retinal tissues, and inaccurate retinal layer structure remain a challenge to perform effective retinal segmentation. Hence, in this research, complicated speckle noises are removed by using a novel Far-flung ratio algorithm in which pre-processing has been done to treat the speckle noise thereby highly decreasing the speckle noise through new similarity ...

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    6. Utilizing deep learning for dermal matrix quality assessment on in vivo line-field confocal optical coherence tomography images

      Utilizing deep learning for dermal matrix quality assessment on in vivo line-field confocal optical coherence tomography images

      Background: Line-field confocal optical coherence tomography (LC-OCT) is an imaging technique providing non-invasive "optical biopsies" with an isotropic spatial resolution of ∼1 μm and deep penetration until the dermis. Analysis of obtained images is classically performed by experts, thus requiring long and fastidious training and giving operator-dependent results. In this study, the objective was to develop a new automated method to score the quality of the dermal matrix precisely, quickly, and directly from in vivo LC-OCT images. Once validated, this new automated method was applied to assess photo-aging-related changes in the quality of the dermal matrix. Materials and methods: LC-OCT ...

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    7. Tail artifacts removal of three-dimensional optical coherence tomography angiography with common parts extraction method

      Tail artifacts removal of three-dimensional optical coherence tomography angiography with common parts extraction method

      In optical coherence tomography angiography (OCTA), each blood vessel has a tail artifact. These tails of superficial vessels will shadow underlying the deep vascular images and make it difficult to reconstruct the three-dimensional (3D) image of the vessels. As 3D structure can provide much more information than two-dimensional (2D) images, it is important to develop a method to remove the artifacts. In this letter, we introduce an image processing technique based on common parts extraction to remove the artifacts. With the help of subtraction operation and erode operation, our method can reconstruct the 3D image of vascular network by extracting ...

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    8. Analysis of penetration depth and healing process of a needleless laser lancet using swept-source optical coherence tomography

      Analysis of penetration depth and healing process of a needleless laser lancet using swept-source optical coherence tomography

      Background and objectives: Needleless laser lancets have been used to reduce needle pain in people who undertake self-monitoring of blood glucose (SMBG). Although clinical trials have been conducted to understand the degree of pain associated with the developed laser blood sampling device, it is only judged by the patients' subjective judgment. This study aimed to analyze the performance and healing process of a needleless laser lancet. In particular, the penetration depth and healing process of a conventional lancet and a needleless laser lancet were quantitatively analyzed using a swept-source optical coherence tomography (SS-OCT) system. Materials and methods: To reduce unnecessary ...

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    9. Investigating the Efficacy and Safety of Calcipotriol/Betamethasone Dipropionate Foam and Laser Microporation for Psoriatic Nail Disease - a Hybrid Trial using a Smartphone Application, Optical Coherence Tomography, and Patient-Reported Outcome Measures

      Investigating the Efficacy and Safety of Calcipotriol/Betamethasone Dipropionate Foam and Laser Microporation for Psoriatic Nail Disease - a Hybrid Trial using a Smartphone Application, Optical Coherence Tomography, and Patient-Reported Outcome Measures

      Background: There is a lack of efficacious topical treatments for patients suffering from psoriatic nail disease (PND). Objectives: We investigated the efficacy of Calcipotriol-Betamethasone Dipropionate (Cal/BD) foam with and without ablative fractional laser (AFL) in patients with PND. Methods: A total of 144 nails from eleven patients were treated in a 24-week long, open-label, randomized, intra-patient controlled proof-of-concept hybrid trial. In addition to daily Cal/BD foam application, half of each patient's psoriatic nails were randomized to receive optical coherence tomography (OCT)-guided AFL treatment at baseline, 6-week, and 12-week follow-ups. In-clinic assessment (N-NAIL), patient-reported outcomes (PROMs), and ...

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    10. Multimodal Raman Spectroscopy and Optical Coherence Tomography for Biomedical Analysis

      Multimodal Raman Spectroscopy and Optical Coherence Tomography for Biomedical Analysis

      Optical techniques hold great potential to detect and monitor disease states as they are a fast, non-invasive toolkit. Raman spectroscopy (RS) in particular is a powerful label-free method capable of quantifying the biomolecular content of tissue, but lacks information about tissue morphology due to its inability to rapidly assess a large field of view with sufficient signal to noise. Optical Coherence Tomography (OCT) is an interferometric optical method capable of fast, depth-resolved imaging of tissue morphology, but lacks detailed molecular contrast. In many cases, pairing label-free techniques into multimodal systems allows for a more diverse field of applications. Integrating RS ...

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    11. Efficacy of optical coherence tomography in the diagnosing of oral cancerous lesion: systematic review and meta-analysis

      Efficacy of optical coherence tomography in the diagnosing of oral cancerous lesion: systematic review and meta-analysis

      Non-invasive diagnostic tools that facilitate visualization of potentially malignant oral lesions and cancers have been introduced. Oral lesions detected by optical coherence tomography (OCT) were compared to reference results based on histological findings. The diagnostic odds ratio (DOR), along with summary receiver operating characteristic curve (SROC), area under SROC, sensitivity, specificity, and negative predictive values, were the outcomes. The DOR of OCT was 86.9190 (95% confidence interval [CI]: 38.7435, 194.9985), and the area under SROC was 0.951. OCT showed good sensitivity (0.9138; 95% CI: 0.8758, 0.9409) and specificity (0.9110; 95% CI: 0 ...

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    12. The alterations of retinal vasculature detected on opticalcoherence tomography angiography associated withchronic obstructive pulmonary disease

      The alterations of retinal vasculature detected on opticalcoherence tomography angiography associated withchronic obstructive pulmonary disease

      Objectives: This study aimed to evaluate the retinal vasculature of the macula and optic disc in patients with chronic obstructive pulmonary disease (COPD) by optical coherence tomography angiography (OCTA). Methods: The right eyes of 70 COPD patients and 71 healthy individuals were evaluated. These patients had moderate airflow limitation and mean PO 2 of 60 mmHg, and their average age was less than 60 years. Superficial and deep capillary plexus vascular densities, foveal avascular zone (FAZ) width, and optic disc parameters were measured with OCTA. In addition, the correlation between the PO 2 level in COPD patients and superficial, deep ...

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    13. Baseline retinal nerve fiber layer thickness as a predictor of multiple sclerosis progression

      Baseline retinal nerve fiber layer thickness as a predictor of multiple sclerosis progression

      Objective: To evaluate the potential of retinal nerve fiber layer (RNFL) thickness (RNFLT) measured with optical coherence tomography in predicting disease progression in relapsing-remitting multiple sclerosis (RRMS). Methods: Analyses were conducted post-hoc of this 24-month, phase III, double-blind study, in which RRMS patients were randomized (1:1:1) to once daily oral fingolimod 0.5 mg, 1.25 mg or placebo. The key outcomes were the association between baseline RNFLT and baseline clinical characteristics, and clinical/imaging outcomes up to 24 months. Change of RNFLT with fingolimod versus placebo within 24 months and time-to-RNFL thinning were evaluated. Results: Altogether 885 ...

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      Mentions: Fudan University
    14. Intravascular imaging for left main stem assessment: An update on the most recent clinical data

      Intravascular imaging for left main stem assessment: An update on the most recent clinical data

      Left main (LM) stem has different structural and anatomical characteristics compared to all of the other segments of the coronary tree, thus its management through percutaneous coronary intervention (PCI) is a challenge and is associated with worse clinical outcome and higher need for revascularization as compared to other lesion settings. Intravascular imaging, by means of intravascular ultrasound (IVUS) or optical coherence tomography (OCT), is an important tool for LM PCI guidance, aiming at improving the immediate performance and the long term outcome of this procedure. Following current guidelines and recent scientific findings, IVUS becomes important to firstly assess, and finally ...

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    15. Optical coherence tomography versus angiography and intravascular ultrasound to guide coronary stent implantation: A systematic review and meta-analysis

      Optical coherence tomography versus angiography and intravascular ultrasound to guide coronary stent implantation: A systematic review and meta-analysis

      Background: Optical coherence tomography (OCT) is an adjunct to angiography-guided coronary stent placement. However, in the absence of dedicated, appropriately powered randomized controlled trials, the impact of OCT on clinical outcomes is unclear. Objective: To conduct a systematic review and meta-analysis of all available studies comparing OCT-guided versus angiography-guided and intravascular ultrasound (IVUS)-guided coronary stent implantation. Methods: MEDLINE and Cochrane Central were queried from their inception through July 2022 for all studies that sought to compare OCT-guided percutaneous coronary intervention (PCI) to angiography-guided and IVUS-guided PCI. The primary endpoint was minimal stent area (MSA) compared between modalities. Clinical endpoints ...

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    16. Outcomes of paclitaxel-coated balloon angioplasty for in-stent calcified nodule: An optical coherence tomography study

      Outcomes of paclitaxel-coated balloon angioplasty for in-stent calcified nodule: An optical coherence tomography study

      Background: Paclitaxel-coated balloon (PCB) angioplasty emerges as an effective therapeutic option for in-stent restenosis (ISR). However, whether PCB angioplasty would be effective for in-stent calcified nodule (ISCN) lesions remain fully understood. This study aimed to evaluate the frequency and outcomes of ISCN in patients undergoing PCB angioplasty for ISR after second-generation drug-eluting stents (G2-DES) implantation. Methods: This study enrolled 179 lesions (160 patients) undergoing PCB angioplasty for G2-DES restenosis with optical coherence tomography guidance. According to the presence of ISCN at the minimum lumen area, the lesions were divided into two groups: the ISCN (n = 16) and the non-ISCN groups ...

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    17. Repeated exposure to fractional CO2 laser delays squamous cell carcinoma formation and prevents clinical and subclinical photodamage visualized by line-field confocal optical coherence tomography and histology

      Repeated exposure to fractional CO2 laser delays squamous cell carcinoma formation and prevents clinical and subclinical photodamage visualized by line-field confocal optical coherence tomography and histology

      Objectives: Ablative fractional laser (AFL) is a well-established modality for treating ultraviolet radiation (UVR)-induced skin photodamage. We aimed to investigate the potential of AFL to delay squamous cell carcinoma (SCC) formation and prevent photodamage in a preclinical UVR-induced SCC model. Materials and methods: Hairless C3.Cg-Hr hr /TifBomTac mice (n = 50) were exposed to UVR three times weekly throughout the study. UV-exposed mice were randomized to two groups that received dorsal CO 2 AFL (10 mJ/mb, 10% density) or no treatment. AFL was performed every other week for a total of 16 weeks (nine treatments in total). The ...

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    18. Lithotripsy for calcified in-stent restenosis.The "rock strata peeling pattern": A novel fracture pattern detected by optical coherence tomography

      Lithotripsy for calcified in-stent restenosis.The "rock strata peeling pattern": A novel fracture pattern detected by optical coherence tomography

      Calcified neoatherosclerosis represents a particularly challenging scenario in patients with in-stent restenosis (ISR), frequently associated with worse angiographic and optical coherence tomography (OCT) results compared with other patients with typical ISR. Intravascular lithotripsy (IVL) has emerged as a safe and effective technology to circumferentially modify calcium in heavily calcified coronary lesions. Preliminary data also suggest its usefulness in calcified neoatheroscerosis. This case report aims to describe a novel fracture pattern after IVL identified by OCT (the "rock strata peeling pattern") in patients presenting with ISR due to calcified neoatherosclerosis.

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    19. Clinical relevance of fibrin membranous structures in the intra-photoreceptor outer segment separation on spectral domain optical coherence tomography (SD-OCT) in initial-onset acute Vogt-Koyanagi-Harada disease

      Clinical relevance of fibrin membranous structures in the intra-photoreceptor outer segment separation on spectral domain optical coherence tomography (SD-OCT) in initial-onset acute Vogt-Koyanagi-Harada disease

      Purpose: The purpose of the study was to investigate clinical relevance of fibrin membranous structure (FMS) in the photoreceptor outer segments on spectral-domain optical coherence tomography (SD-OCT) in untreated initial-onset acute Vogt-Koyanagi-Harada (VKH) disease. Methods: Clinical charts of 39 patients (78 eyes) diagnosed with initial-onset VKH disease were retrospectively reviewed. Age, gender, period from the onset of symptoms to first visit, visual acuity (VA), intraocular pressure (IOP), anterior chamber cells, serous retinal detachment (SRD), SD-OCT findings, as well as fluorescein (FA), and indocyanine green angiography (ICGA) were collected. Results: FMS was observed in 24 out of 39 VKH patients in ...

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    20. Evaluation and characterization of facial skin aging using optical coherence tomography

      Evaluation and characterization of facial skin aging using optical coherence tomography

      Objectives: The skin aging exposome encompasses internal and external factors that contribute to clinical signs of facial aging. Aging skin can be characterized by distinctive features such as wrinkles, lentigines, elastosis, and roughness. Optical coherence tomography (OCT) is capable of noninvasively measuring skin characteristics. This study aimed to assess bilateral features using OCT to explore temporal skin changes among decades and potential changes in facial skin aging based on laterality. Methods: A total of 97 subjects between 20 and 89 years old with Fitzpatrick skin types I to IV were enrolled. VivoSight, a Multi-Beam OCT system intended to gather topographical ...

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    21. Diseased thyroid tissue classification in OCT images using deep learning: towards surgical decision support

      Diseased thyroid tissue classification in OCT images using deep learning: towards surgical decision support

      Intraoperative guidance tools for thyroid surgery based on optical coherence tomography (OCT) could aid distinguish between normal and diseased tissue. However, OCT images are difficult to interpret, thus, real-time automatic analysis could support the clinical decision making. In this study, several deep learning models were investigated for thyroid disease classification on 2D and 3D OCT data obtained from ex vivo specimens of 22 patients undergoing surgery and diagnosed with several thyroid pathologies. Additionally, two open-access datasets were used to evaluate the custom models. On the thyroid dataset, the best performance was achieved by the 3D vision transformer model with a ...

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