The purpose of this research study is to develop a better understanding of vascular stains and to improve the usual laser treatment for vascular stain by using optical coherence tomography (OCT). This study is being done at the University of Wisconsin-Madison (UW-Madison) and University of California, Irvine. A total of about 85 people will participate in this study.

Rationale: Dual antiplatelet therapy (DAPT), consisting of aspirin and a P2Y12-inhibitor, reduces the risk of stent thrombosis, myocardial infarction and stroke after coronary stent implantation. Inevitably, it is also associated with a higher risk of (major) bleeding. Given the advances in stent properties, stenting implantation technique and pharmacology, it may be possible to treat patients with a single antiplatelet strategy using a potent P2Y12- inhibitor such as prasugrel. Objective: This study will serve as a pilot to investigate the feasibility and safety of a single antiplatelet strategy with prasugrel prior to, during and after stent implantation in 75 patients with ...

This study aims to investigate the utilization of intravascular imaging in treatment of tibial vessels in peripheral artery disease and critical limb ischemia (CLI). The primary goal is to compare optical coherence tomography (OCT) with traditional digital subtraction angiography (DSA) in determining best treatment strategy and vessel optimization, in an effort to improve long term patency and successful wound healing in CLI. Secondary comparison with intravascular ultrasound (IVUS) is undertaken when clinically feasible. The hypothesis is that the adjunctive use of intravascular imaging will affect vessel sizing and anticipated treatment modalities, and therein affect the long term primary patency rates.

The purpose of this pilot study is to examine the treatment basal cell carcinoma (BCC) with laser technology under the guidance of optical coherence tomography imaging (OCT). The laser modality that we plan to use is the long-pulse Nd:YAG 1064nm laser, which is a non-ablative laser already shown to effectively treat BCC. Laser treatment of BCC has limited precedent in the literature, but the addition of OCT has the opportunity to enhance outcomes by better targeting the treatment and permitting more precise monitoring of clearance. We propose to use OCT imaging to guide the laser treatment to achieve optimal ...

The purpose of this study is to find out whether using noninvasive methods to study the appearance of lesions can improve diagnostic accuracy before a biopsy is required and help guide treatment planning. The database created to store these images is called an Image Repository, and it will be used to support clinical practice, teaching and training, and future research.

We have recently developed and optimized a vaginal Optical Coherence tomography /angiography endoscopy imaging system. This technology is able to obtain a comprehensive image of the vaginal epithelium, blood vessels, and lamina propria. The primary focus of this study is establishing the Optical Coherence Tomography system's capability of capturing vaginal changes that occur before and after menopause, as well as before and after treatment with fractional-CO2 laser therapy.

The objective of this study is to clinically develop and evaluate a machine learning approach to improve the performance and data interpretation of the PhotoniCare TOMi Scope in pediatric patients presenting at the primary care office for suspected ear infections. In this observational study, results of TOMi Scope imaging will not affect patient standard of care.

The purpose of this research project is to study small airways physiological function in patients with chronic obstructive lung disease or COVID-19 and explore the relationship with in-vivo microanatomical small airway structure as measured by OCT. Correlating endobronchial assessment with multiple breath nitrogen washout and impulse oscillometry will allow the characterisation of the relationship between small airway structural findings and these validated investigations. A small volume lung wash, endobronchial brushings and the collection of a limited number of endobronchial cryobiopsy samples will be performed to better understand the endobronchial environment of the small airways through inflammatory studies. Following the completion ...

To investigate the structural and vascular features of choroid in patients affected by PCV after Ranibizumab intravitreal injection.

The aim of the study is to assess the effect of evolocumab on coronary plaque morphology using intravascular imaging and gene expression analysis of peripheral blood mononuclear cells (PBMC) in patients with stable CAD on maximally tolerated statin therapy. The study combines multi-modality intravascular imaging approaches and transcriptomic based machine learning algorithms to uncover molecular mechanisms responsible for the beneficial changes in atherosclerotic lesions of patients treated with evolocumab. The primary end-points are the changes from baseline to follow-up in (1) the minimal fibrous cap thickness (FCT) assessed by optical coherence tomography (OCT) and (2) maxLCBI4mm assessed by near-infrared spectroscopy ...

Plaque erosion is associated with myocardial infarction (MI) in about 30% of cases and may require a different management approach to plaque rupture. The investigators hypothesise that plaque erosion leads to higher levels of apoptotic circulating endothelial cells (CECs) compared to plaque rupture. Aims: To compare associations between plaque erosion and plaque rupture with numbers and types of apoptotic CECs in patients with non-ST elevation MI (NSTEMI) and stable coronary artery disease controls (CAD). Additional aims are to explore signals of cellular stress (mitochondrial dsDNA), sub-populations of activated neutrophils, circulating endothelial progenitor cells and erosion-specific plasma biomarkers. Methods: Prospective observational ...

Calcified coronary artery disease is a frequently encountered problem that can lead to poorer outcomes for patients undergoing PCI. Recently, intravascular lithotripsy has become available for the treatment of callcified coronary artery disease. The effect of intravascular lithotripsy on varying calcium patterns has not been adequately explored. This is an investigator initiated, open label, non-blinded, observational study involving a number of centers in Spain examining the effect of intravasuclar lithotripsy in varying calcium patterns. 100 patients wll be enrolled. Optical coherence tomography will be used to assess the effect of intravascular lithotripsy on varying calcium patterns (concentric, eccentric and nodular).

To investigate, using optical coherence tomography angiography, the retinal vascular features in patients affected by RAP.

This trial is designed to associate angiography-based fractional flow reserve (3D-angio-based FFR) values with optical coherence tomography findings in pre- and post-percutaneous coronary intervention in patients with non-ST segment elevation acute coronary syndromes.

Skin biopsy is the main method to diagnose skin tumors, skin inflammation, and pigmented diseases. However, biopsy is an invasive method that can cause wounds and scars. Optical coherent tomography (OCT) technology is a fast, non-invasive, non-radioactive, and label-free imaging method. This technology generates real-time images of living tissue by detecting the variations in the refractive indexes of various components in soft tissues. Recently, there is a breakthrough progress that the newly designed ultrahigh resolution OCT can provide in vivo cellular resolution similar to histopathological sections in the high magnification. In our previous clinical trial "Early feasibility study: application of ...

This is a pilot study aiming to investigate the ability of a novel Optical Coherence Tomography (OCT) probe in assessing the different layers of the gastrointestinal tract and the depth of invasion of early neoplasia, utilising surgically and endoscopically resected specimens Endoscopic treatment of early neoplasia in the gastrointestinal tract has been established as the standard therapy in the past decade. Various endoscopic resection techniques have been developed, such as endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD), to ensure complete removal of such lesions and avoid recurrence. Successful endoscopic resection of early gastrointestinal (GI) neoplasia relies on accurate ...

OCT allows precise evaluation of intimal injury after lesion preparation and may improve the acute results and long-term outcomes after paclitaxel drug-coated balloon angioplasty. This prospective multicenter randomized controlled study aims to evaluate the long-term efficacy and safety of paclitaxel coated balloon in the treatment of native large coronary arteries by OCT guided is not inferior to drug-eluting stent.

The purpose of this study is to use optical coherence tomography angiography (OCT-A) to compare retinal vasculature after uncomplicated cataract surgery in patients with and without diabetic retinopathy.

Evaluation of age-related skin changes using clinical probe measurements and imaging modalities in Chinese subjects.

EYEdeal Scanning Technology enables rapid measurement of corneal and scleral topography. By accurately measuring the ocular surface with this imaging technology, the current iterative fitting method required to fit PROSE (prosthetic replacement of the ocular surface ecosystem) devices could be replaced and/or strengthened with a more rapid, automated fitting sequence. This could considerably reduce the time needed per visit, the number of visits, and the number of devices needed to be manufactured to reach the endpoint. Additionally, the scanning technology may afford the opportunity to successfully fit some pathology that were previously treatment failures. The automated technology may as ...

Subjects will go a comprehensive ophthalmologic examination including review of medical history, best-corrected visual acuity (BCVA), slit-lamp biomicroscopy, intraocular pressure (IOP) measurement, gonioscopy, dilated fundoscopic examination, stereoscopic optic disc photography, and automated perimetry using Swedish Interactive Threshold Algorithm (SITA Standard 24-2). Only subjects with open angles on gonioscopy were included. One eye of each subject will be scanned by a high-speed 1050-nm-wavelength swept-source OCT instrument. OCT is providing measurements of the RNFL thickness, ONH, as well as the inner macula for the assessment of glaucoma progression. The split-spectrum amplitude-decorrelation angiography (SSADA) algorithm will be used to compute 3-dimensional optic disc ...

Cachectic patients and controls undergoing a comprehensive ophthalmologic examination. The imaging of all subjects is undertaken using a commercial OCTA device with a scan rate of 70,000 A-scans/s, scan beam wavelength of 840 ± 10 nm and bandwidth of 45 nm. All measurements are performed between 10:00 and 12:00 on the same day. The OCTA images are independently graded and assessed by two retinal specialists. The software automatically segmented these full-thickness retinal scans into the superficial and deep inner retinal vascular plexuses, outer retina, and choriocapillaris (CC). The vascular density in the superficial and deep retinal vascular ...

Non-pathological high myopia patients and controls undergoing a comprehensive ophthalmologic examination are included. The Optical Coherence Tomography Angiography (OCTA) software automatically segments these full-thickness retinal scans into the superficial and deep inner retinal vascular plexuses, outer retina, and choriocapillaris (CC). The vascular density in the superficial and deep retinal vascular zones is calculated automatically by the software, and the foveal avascular zone (FAZ) and foveal density (FD) are also automatically determined. Choroidal thickness is calculated manually by two retinal specialists, and the average value was used.

Prospective non randomized case series study included 50 eyes. The study is conducted on patients attending to the oculoplastic unit of ophthalmology department of Minia university hospital. Informed consents were obtained from the participants in this study. The study was adherent to the tenets of declaration of Heleniski. Anterior segment optical coherence tomography (AS-OCT) was performed for the included patients after perforated plug implantation (during the first operative weak)