Stroke was the second leading cause of death worldwide and the leading cause of death in China in 2017. ICAS accounted for 10% to 15% of ischemic stroke in Western countries, and as much as 46.6%in Asia in 2009. For patients with ICAS, the risk of stroke is highly related to the histopathology of atheromatous plaques. Therefore, characterizing the morphology and composition of plaques in ICAS may help to predict the risk of stroke occurrence and allow the adoption of preventive or therapeutic management to prevent such life-threatening events. OCT, with a resolution of 10μm, may provide ...

Diabetic patients pose a particular challenge because of the tendency for early formation of cataract in them and propensity to develop macular edema after cataract surgery. Macular edema (ME) is a major cause of vision loss after cataract surgery in patients with diabetes . Macular edema is a common cause of unfavorable visual outcome after cataract surgery. Clinically significant cystoid macular edema (CSME) has a reported incidence of 1% to 2% after cataract surgery. Diabetes has been associated with an increased incidence of postoperative macular edema. The incidence of macular edema on optical coherence tomography (OCT) was 22% in diabetic eyes ...

The purpose of this study is to complete performance testing of our custom optical coherence tomography (OCT) device to verify it can deliver retinal images of similar quality to a commercial OCT device

Optical coherence tomography is a non-invasive scanner which generates real-time in-vivo images of the skin and its adnexal structures. Images are generated by light-interferometry.

Optical Coherence Tomography (OCT) is used to capture reproducible ocular morphology and cross-sectional tissue measurements in-vivo in a rapid, non-invasive, non-contact manner. It has displaced ophthalmoscopy and stereo photography for clinical assessment and documentation of retinal microanatomy including thickness, cystoid structures, subretinal fluid and retinal traction.(1) Spectral Domain Optical Coherence Tomography (SDOCT) has the speed and resolution required for real-time noninvasive three-dimensional imaging of critical pathology. While modern ophthalmic surgery has benefited from rapid advances in instrumentation and techniques (2-6), the basic principles of the stereo zoom operating microscope have not changed (except for increased automation) since the 1930 ...

This study will examine the improvement in middle ear optical coherence tomography imaging from the topical application of glycerol to the tympanic membrane in normal, opaque and post-operative ears

There has been ample evidence of the role of intracoronary imaging for optimizing the stent, especially among the patients with complex coronary lesions. Intracoronary imaging can be used during the entire process of percutaneous coronary intervention (PCI), from pre-PCI to post-PCI stages. Notably, approximately 15-20% of patients who underwent angiographically successful PCI showed significant stent underexpansion, malapposition, intra-stent thrombus formation, and edge dissection on intracoronary imaging studies, including optical coherence tomography (OCT). Meanwhile, the role of pre-interventional fractional flow reserve (FFR) measurement has been well established and recommended by recent guideline. However, although previous studies evaluated the efficacy and safety ...

Chronic thromboembolic pulmonary hypertension (CTEPH) is a disease of obstructive pulmonary artery remodelling as a consequence of major vessel thromboembolism. The diagnosis of CTEPH is based on findings obtained after at least 3 months of effective anticoagulation in order to discriminate this condition from subacute PE. These findings are mean pulmonary artery pressure ≥25mmHg with pulmonary artery wedge pressure ≤15 mmHg, mismatched perfusion defects on lung scan and specific diagnostic signs for CTEPH seen by multidetector CT angiography, MR imaging or conventional pulmonary cineangiography, such as ring-like stenoses, webs/slits and chronic total occlusions (pouch lesions or tapered lesions). Balloon ...

The purpose of this study is to find out more about how Basal Cell Carcimonas/BCCs grow and to learn more effective ways to monitor and treat these common cancers. This study will not provide any type of treatment for the participants' cancer; it is a 3-year observational study to monitor participants' cancer.

Topical Brimonidine is a well-established topical antigalucoma, ocular hypotensive therapeutic that has been in use since 1996. Brimonidine stands out among other topical ocular hypotensives in that it has a neuroprotective effect that is independent of IOP reduction. This has been demonstrated in multiple animal and human controlled studies both in vivo and in vitro. The mechanisms proposed so far to account for this neuroprotection focus mainly on molecular level antiapoptotic effects and modulation of some excitatory stimuli like glutamate. In this study we try to test the hypothesis that a positive hemodynamic profile of Brimonidine on ocular blood flow ...

To compare alternation of retinal microcirculation within the macula and optic disc in patients with dementia, mild cognitive impairment (MCI), and cognitively healthy subjects who had positive amyloid biomarkers (Aβ +) or not, using optical coherence tomography angiography (OCTA).

This retrospective-prospective bidirectional cohort study aims to observe ocular parameter changes, different surgical/vision recovery strategies and postoperative adverse effects among young children with cataract. The influence on psychology and cognitive function will be taken into consideration as well. Pediatric cataract, one of the leading causes of childhood blindness globally, is complex and of great difficulty in treatment. Pediatric patients with cataract (congenital, traumatic or complicated) are enrolled. In this study, investigators will compare ocular parameter changes, different surgical/vision timing or recovery strategies and adverse effects among young children （age < 18 yo）before and after cataract surgery. The influence ...

Rationale: Various middle ear diseases can affect anatomical structures of the middle ear in different ways. Unfortunately, current methods for assessing the structure and function of the constituents of the middle ear are limited and often fail to provide all clinically relevant data. Optical coherence tomography (OCT) is a technology that can provide valuable, additional information with a newly developed prototype OCT-device for structural and functional imaging of the middle ear. Objective: To assess the feasibility and the clinical potential of structural and functional OCT imaging with a newly developed OCT-device in patients with various middle ear problems. Study design ...

To quantitatively analyze the fundus structure and microvascular characteristics of GFCS and non-GFCS (NGFCS) using optical coherence tomography angiography (OCTA), to explore the vascular-structural association, and to assess the diagnostic abilities of structure parameters.

Data from human autopsy studies have showed that thrombosis of a ruptured plaque with a large necrotic core, inflammatory cells and a thin fibrous cap, the so-called thin cap fibroatheroma (TCFA), represents the main mechanism for acute coronary syndrome (ACS). Optical coherence tomography (OCT) is an imaging technique that provides high-resolution, cross-sectional images of tissue in situ. The resolution of OCT (10 um) is appropriate for measuring a cap thickness less than65 μm, and even the plaque macrophage density. 68Ga-DOTA-(Tyr3)-octreotate/NaI3-octreotide(68Ga-DOTA-TATE/NOC) Positron Emission Tomography (PET)/Computed Tomography coronary angiography (CTCA), targeting the somatostatin receptor subtype-2 selectively ...

The prevalence of diabetes mellitus has increased significantly in Hong Kong for the past decade [1]. Diabetic macular edema is one of the most common causes of vision loss in patients suffering from diabetes mellitus [3]. Before the introduction of anti-vascular endothelial growth factor agents, laser photocoagulation has been the mainstay treatment for patients with diabetic macular edema. There are two types of laser treatment modalities, namely focal laser, which can be applied either in a grid pattern over a region of macular edema or to selected microaneurysms, and subthreshold micropulse laser. Only one meta-analysis published in 2016 [16] had ...

In this study, lymph node or lung nodule tissue will be collected by bronchoscopy as part of standard clinical care. The tissue is being collected to help make a diagnosis of a pulmonary condition. The same amount of tissue that is collected per standard of care for diagnosis will be collected during the study; no additional tissue is taken for this study. The biopsy sample will be analyzed by the Aquyre Biopsy Scanner which will provide images of unprocessed lung biopsy tissue taken during your procedure. A pathologist will also analyze the tissue sample in accordance with existing clinical guidelines ...

This original clinical research project utilizes cutting-edge medical imaging technologies for diagnosis of pigmented skin tumours, combined for the first time in Denmark, with molecular RNA and lipid analysis of superficial tumours cells. The scanning technologies are reflectance confocal microscopy (RCM), which is a microscope applied directly to the skin surface, and photoacoustic imaging, also termed multispectral optoacoustic imaging (MSOT), which is an imaging technology actually listening to the skin for immediate bedside diagnosis of pigmented skin tumors. The hypothesis is that treatment guided by diagnostic bedside skin scanning, combined with tumour tape-stripping and RNA and lipid analysis can increase ...

Conditions :   Skin Cancer;   Malignant Melanoma Intervention :   Diagnostic Test: Reflectance confocal microscopy (RCM), Photoacoustic imaging (PAI) and tape-strippng of RNA and lipids Sponsor :   University Hospital Bispebjerg and Frederiksberg Recruiting

Objective: The objective of the study is to collect adaptive optics (AO) retinal images from human subjects with outer retinal diseases (diseases of the outer retina including photoreceptor, retinal pigment epithelium (RPE), basement membrane or choroidal pathologies) to develop new diagnostic methods, biomarkers, and clinical endpoints. Study Population: Up to fifty (50) healthy volunteers without eye disease (Cohort 1) and up to fifty (50) affected participants with any type of outer retinal disease (Cohort 2) will be enrolled. Design: This is a longitudinal study protocol where participants will be imaged with investigational multimodal AO (mAO) retinal imaging systems that include ...

Otitis media (OM) is the most common diagnosis in pediatric patients seen for illness in the United States, affects 90% of all children, and is the most common indication for antimicrobial therapy and surgery in young children. Despite many attempts to improve diagnosis, treatment, and prevention, OM continues its highly prevalent impact on children and substantial ongoing morbidity. OM continues as the most common cause of hearing loss in children and leads to speech, educational and other developmental delays. OM causes life-threatening complications and is expensive, resulting in over $5 billion annually in U.S. health care expenditures. Despite the ...

The choroidal osteoma is a rare benign tumor of choroid, it is bilateral in 10%-25% of cases, affecting usually young women. Previous studies evaluated the morphologic characteristics of tumor-related vasculatures, described as a seafun vascular networks, but none focused on study of vessel density of coriocapillary. The aim of this study is to investigate the potential role of the optical coherence tomography angiography (OCTA) in evaluating the choriocapillary vessel density in order to individuate the changes of this vascular network that may influence the onset of choroidal neovasculariztion. Therefore, OCTA could be useful in the clinical management of the ...

There are mainly 3 types of skin cancer: melanoma, basal cell carcinoma and squamous cell carcinoma. The diagnosis of skin cancers is now based on anatomo-pathological evidence. However, given the progress made, imaging is a technique that now has a full role in the diagnosis of these pathologies. This is particularly the case of confocal optical coherence tomography (LC-OCT), which is a recent imaging technique that has proven itself in ophthalmology with the obtaining of precise images of the retina. LC-OCT can be applied in dermatology according to the following principle: the low intensity laser beam delivered by the LC-OCT ...

This study aims to detect changes in RNFL thickness in patients with different types of migraine in comparison to healthy control. This will be accomplished by comparing the optic nerve head (ONH) parameters, RNFL thickness, and ocular perfusion pressure (OPP) in migraine patients with age and sex matched healthy control.