Optical coherence tomography (OCT) is an imaging modality, first described in 1991, that provides cross-sectional images of the eye in a non-invasive manner. OCT is analogous to ultrasonography but measures the "echoes" of light waves rather than sound and, as a result, generates extremely high-resolution images (~5 μm axial resolution). Although OCT has already proven revolutionary in ophthalmology, current OCT systems are large, expensive, and require skilled personnel for image acquisition and interpretation. Furthermore, current OCT systems are limited to examination of specific regions of single eyes - for example, separate devices are typically required for anterior segment (e.g., cornea ...

The purpose of this study is to show that alirocumab with statin therapy have a s tronger stabilizing effect on vulnerable plaque in coronary artery disease than statin alone administration. The investigators investigate to evaluate the efficacy of alirocumab for vulnerable plaque. The investigators enrolled the patient with standard statin therapy who were detected vulnerable plaque by optical coherence tomography, and categorized into two group; the patients with alirocumab and rosuvastatin were categorized alirocumab therapy group, and the patients with rosuvastatin alone were categorized standard statin therapy group. The investigators compare these two group for outcomes.

The current limitations in prostate cancer diagnostics lead to over- and undertreatment for a significant fraction of patients. Confocal Laser Endomicroscopy (CLE) and Optical Coherence Tomography (OCT) are focal imaging modalities with potential for in-vivo prostate imaging. The investigators anticipate that integrating focal imaging with MRI/TRUS fusion will further improve prostate cancer detection and provides a real-time histopathological threedimensional representation of the tumor lesions. This is an investigator-initiated, prospective in-vivo safety and feasibility study with transperineal template mapping biopsies (TTMB) and two focal imaging methods, CLE and OCT, in prostate tissue.

This main goal of this study is to improve the detection, classification, monitoring, and treatment of irregular corneas due to keratoconus, warpage, dry eye, scar, stromal dystrophies, and other corneal conditions. The primary goal will be achieved by using optical coherence tomography (OCT) to: Develop an OCT-based system to classify and evaluate corneal-shape irregularities. Develop OCT metrics for more sensitive detection of keratoconus progression. Develop OCT-and-topography guided phototherapeutic keratectomy (PTK) for irregular corneas.

A non inferiority trial to determine the capability of optical coherence tomography (OCT) imaging to show vessel morphology in comparison to imaging provided by intravascular ultrasound imaging (IVUS).

To evaluate the lower puntum dimensions in cases of acquired punctal stenosis(APS), using anterior segment optical coherence tomography (AS-OCT).

Percutaneous coronary intervention (PCI) is increasingly used to treat unprotected left main coronary artery stenosis. Protected LM PCI is considered standard of care in most centers. OCT allows for precise determination of stent placement, stent expansion and apposition. The pattern of vessel healing can be very precisely studied if immediate post-stent implantation OCT/IVUS data is compared to the 6-month post-PCI interval. While OCT cannot be optimally used for ostial lesion imaging, IVUS can be used to image ostial lesions/stent placement. Optimal and consistent vessel healing is particularly important in LM PCI where stent thrombosis is a potential complication ...

In this observational study, the investigators aim to evaluate whether changes in the retinal and choroidal circulation, as assessed by Optical Coherence Tomography (OCT) and the quantification of retinal amyloid deposits using auto-fluorescence and hyperspectral retinal imaging, are correlated with the degree and subtype of dementia and with the presence or absence of a positive amyloid scan. For this purpose, patients with established Alzheimer's Disease (AD) and Lewy Body Dementia (LBD), as well as amyloid positive and amyloid negative Mild Cognitive Impairment (MCI) and aged matched cognitively intact patients will be included in this cross-sectional study.

ILM-flap transposition is a new surgical option in repair of macular holes, therefore one year outcomes are needed to better evaluate that method.

The development of optical coherence tomography (OCT) and its application for in vivo imaging has opened entirely new opportunities in ophthalmology (Wojtkowski, Kaluzny et al. 2012; Drexler, Liu et al. 2014). The technology allows for both noninvasive visualization of the morphology and measurement of functional parameters within ocular tissues to a depth of a few millimetres even in nontransparent media. Until now the resolution of commercially available OCT systems is, however, much lower than that provided by light microscopy. Recently, an ultrahigh-resolution OCT system was developed by our group providing resolutions of 1.7 and 17 µm in axial and ...

In ophthalmology vitreo-macular adhesion, vitreo-macular traction and posterior vitreous detachment were recognized entities for a long time. On the other hand vitreo-papillary adhesion/ traction is a fairly new concept in ophthalmology that became known after the use of OCT in ophthalmology imaging. Reasons, effects and ways of treatment of vitreo-papillary traction will take some time to evolve. The case study in which this traction was documented was initiated by an observation of a persistent, tiny single retinal hemorrhage above the optic disc of an eye. The patient was completely asymptomatic because of the vitreo-papillary traction but the OCT documentation of ...

This is a pilot study to test a newly developed optical coherence tomography (OCT) device to determine 1) whether adequate tissue contact can be attained to acquire high quality images, and 2) to identify if these images can discern whether the imaged tissue is squamous or Barrett's Esophagus (BE) epithelium.

Optical coherence tomography angiography (OCTA) is a new non-invasive imaging technique that employs motion contrast imaging to high-resolution volumetric blood flow information. OCTA compares the decorrelation signal between sequential OCT b-scans taken at precisely the same cross-section in order to construct a map of blood flow. At present, level 1 evidence of the technology's clinical applications doesn't exist. The investigators plan to compare OCTA as an imaging modality to conventional imaging modalities used in clinical routine.

This study is to establish the primary hypothesis that Optical coherence tomography-guided Percutaneous coronary intervention(OCT-guided PCi) is superior to Intravascular ultrasound guided Percutaneous coronary intervention(IVUS-guided PCI) regarding the target vessel failure at 1 year.

Occlusion of the retinal arteries is an emergency which causes sudden, painless unilateral vision loss. Loss of blood flow causes ischemic damage to the retina. The extent of damage depends on the area affected. Following the acute phase of the disease re-canalization occurs and lesser blood flow can be detected usually without functional recovery. Purpose of the study is to examine the retinal blood flow in chronic cases of retinal artery occlusion. Standard procedures to examine this disease include retinoscopy following pupil dilation, fluorescein angiography and more recently, optical coherence tomography (OCT). The latest direction in OCT development was OCT ...

This study is the sub-study of OPINION Trial. (UMIN000010580) The aim of this study is to evaluate how Optical frequency domain imaging (OFDI) or Intravascular Ultrasound (IVUS) imaging technology influence to the Percutaneous Coronary Intervention (PCI) strategy. Optical frequency domain imaging (OFDI) is a novel, high resolution intravascular imaging modality. Intravascular ultrasound (IVUS) is a widely used conventional imaging modality for achieving optimal stent deployment. This study is the sub-study of OPINION Trial. (UMIN000010580) The aim of this study is to evaluate how OFDI or IVUS imaging technology influence to the Percutaneous Coronary Intervention (PCI) strategy. We will enroll the ...

The coronary images of selective angiography and optical coherence tomography with FFR(Fractional Flow Reserve) values of the intermediate lesions (50-70% stenosis) will be prospectively registered. The coronary images of selective angiography and optical coherence tomography with FFR(Fractional Flow Reserve) values of the intermediate lesions (50-70% stenosis) will be prospectively registered. The patients with intermediate lesions after CT angiography and invasive coronary angiography will be screened, and optical coherence tomography, FFR and selective CT angiography will be performed. The coronary images and FFR values will be registered, and the patients will be followed-up up to 2 years to investigate ...

Some alterations of the foveal contour do not meet the criteria established for the definition of lamellar macular hole on the basis of optical coherence tomography (OCT). However, these alterations may show an appearance, on blue fundus autofluorescence (B-FAF) imaging, reminiscent of lamellar macular hole. The aim of the study is to evaluate in detail these alterations recording simultaneously OCT and B-FAF.

The aim of this pilot study is to assess the ability of a new polarization sensitive optical coherence tomography system to obtain high-quality images of retinal birefringence. Glaucoma is the second leading cause of blindness in the world. The current clinical standard-of-care procedure to diagnose glaucoma is visual field testing with disc photography. Visual field testing is subjective both in the patient's feedback and the physician's interpretation of this feedback, and disc photography requires a physician's subjective interpretation. As a result, it is estimated that current methods can diagnose glaucoma only after 40% of the nerve fiber ...

We evaluate the intraoperative optical coherence tomographic (OCT) images of eyes with idiopathic macular hole (MH) or lamellar macular hole whether the intraoperative OCT findings will affect postoperative visual outcome.

To find out the safety and efficacy of Optical Coherence Tomography (OCT) in the evaluation and treatment of angiographically borderline coronary artery lesions in a Chinese population, and to compare the effectiveness of OCT versus SPECT in treating such subjects. All patients included in the study will be those that are found to have borderline coronary artery lesions on coronary angiography, in whom we feel that OCT will be useful to assess whether PCI will be of benefit to the treatment of the lesion pathology, or whether optimal medical therapy is the most appropriate treatment modality. Those patients who declined ...

To determine the clinical relevance of vulnerable plaque using OCT in patients with coronary bifurcation lesion.

The purpose is to compare median two-year clinical outcome after OCT guided vs. standard guided revascularization of patients requiring complex bifurcation stent implantation

The OPTICO-ACS- study program - combining for the first time in vivo characterization of the ACS-causing "culprit lesion" by intracoronary imaging technique with optical coherence tomography (OCT) and molecular analysis of immune-cells derived from the culprit coronary thrombus and biochemical analyses in patients with acute-coronary-syndrome (ACS).