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Progress in Retinal and Eye Research Sep 2017OCT has revolutionized the practice of ophthalmology over the past 10-20 years. Advances in OCT technology have allowed for the creation of novel OCT-based methods.... (Review)
Review
OCT has revolutionized the practice of ophthalmology over the past 10-20 years. Advances in OCT technology have allowed for the creation of novel OCT-based methods. OCT-Angiography (OCTA) is one such method that has rapidly gained clinical acceptance since it was approved by the FDA in late 2016. OCTA images are based on the variable backscattering of light from the vascular and neurosensory tissue in the retina. Since the intensity and phase of backscattered light from retinal tissue varies based on the intrinsic movement of the tissue (e.g. red blood cells are moving, but neurosensory tissue is static), OCTA images are essentially motion-contrast images. This motion-contrast imaging provides reliable, high resolution, and non-invasive images of the retinal vasculature in an efficient manner. In many cases, these images are approaching histology level resolution. This unprecedented resolution coupled with the simple, fast and non-invasive imaging platform have allowed a host of basic and clinical research applications. OCTA demonstrates many important clinical findings including areas of macular telangiectasia, impaired perfusion, microaneurysms, capillary remodeling, some types of intraretinal fluid, and neovascularization among many others. More importantly, OCTA provides depth-resolved information that has never before been available. Correspondingly, OCTA has been used to evaluate a spectrum of retinal vascular diseases including diabetic retinopathy (DR), retinal venous occlusion (RVO), uveitis, retinal arterial occlusion, and age-related macular degeneration among others. In this review, we will discuss the methods used to create OCTA images, the practical applications of OCTA in light of invasive dye-imaging studies (e.g. fluorescein angiography) and review clinical studies demonstrating the utility of OCTA for research and clinical practice.
Topics: Angiography; Humans; Retina; Retinal Diseases; Retinal Vessels; Tomography, Optical Coherence
PubMed: 28760677
DOI: 10.1016/j.preteyeres.2017.07.002 -
Turk Kardiyoloji Dernegi Arsivi : Turk... Jun 2021
Topics: Arterial Occlusive Diseases; Coronary Angiography; Humans; Radial Artery; Ultrasonography, Interventional
PubMed: 34106057
DOI: 10.5543/tkda.2021.21114 -
JACC. Cardiovascular Imaging May 2019
Topics: Coronary Angiography; Fractional Flow Reserve, Myocardial
PubMed: 29550309
DOI: 10.1016/j.jcmg.2018.02.013 -
Igaku Butsuri : Nihon Igaku Butsuri... 2021IVR-CT was developed at Aichi Cancer Center (Japan) in 1992 and is now in use worldwide. It was developed initially for the purpose of performing CT more easily during... (Review)
Review
IVR-CT was developed at Aichi Cancer Center (Japan) in 1992 and is now in use worldwide. It was developed initially for the purpose of performing CT more easily during arteriography, but also during non-vascular IR procedures such as biopsy and drainage. Four-detector-row IVR-MDCT was introduced to Shizuoka Cancer center in 2002, which was upgraded to 320-Row IVR-ADCT (320-IVR-CT) by 2013. Although we performed an initial investigation into the efficacy of 320 IVR-CT for vascular intervention, the direct MPR method using volume scanning is predominant in the field of non-vascular intervention. In this review, we describe the history of IVR-CT, report the efficacy of 320-IVR-CT for vascular and non-vascular intervention, and report our experiences.
Topics: Angiography; Humans; Japan
PubMed: 34744140
DOI: 10.11323/jjmp.41.3_92 -
Diagnostic and Interventional Imaging Sep 2022Diagnostic radiologists play an important role in the evaluation of patients presenting with signs and symptoms of lower extremity peripheral vascular disease, including... (Review)
Review
Diagnostic radiologists play an important role in the evaluation of patients presenting with signs and symptoms of lower extremity peripheral vascular disease, including critical limb ischemia in both acute and chronic settings, and intermittent claudication. The complications associated with tissue and/or limb loss related to acute limb ischemia and critical limb ischemia of the lower extremity make rapid diagnosis and early intervention critical in the management of these patients. Computed tomography angiography (CTA) is an effective, widely available, easily reproducible, non-invasive imaging modality that offers a rapid and accurate means to diagnose and grade the extent of vascular disease. However, CTA run-off reports are usually dictated in free text form, and referring and treating physicians may be unsure whether an anatomic structure has been evaluated if it has not been specifically mentioned in the report. In this article, the vascular anatomy and anatomic variants of the lower extremity, the most common lower extremity vascular pathologies are reviewed and clinically important CTA imaging findings are outlined. This provides a framework for radiologists to accurately evaluate lower extremity vascular pathologies and convey clinically relevant imaging findings for management by vascular surgeons or interventional radiologists.
Topics: Angiography; Computed Tomography Angiography; Humans; Ischemia; Lower Extremity; Peripheral Vascular Diseases
PubMed: 35843841
DOI: 10.1016/j.diii.2022.06.010 -
Deutsches Arzteblatt International Jun 2019
Topics: Angiography; Computed Tomography Angiography; Tomography, X-Ray Computed
PubMed: 31431250
DOI: 10.3238/arztebl.2019.0460b -
Asia-Pacific Journal of Ophthalmology... 2019
Topics: Angiography; Eye Diseases; Humans; Image Processing, Computer-Assisted; Tomography, Optical Coherence
PubMed: 31037875
DOI: 10.22608/APO.201984 -
JACC. Cardiovascular Interventions Oct 2016
Topics: Coronary Angiography; Radial Artery
PubMed: 27712734
DOI: 10.1016/j.jcin.2016.07.036 -
Journal of the American College of... Nov 2022Arterial claudication is a common manifestation of peripheral artery disease. This document focuses on necessary imaging before revascularization for claudication....
Arterial claudication is a common manifestation of peripheral artery disease. This document focuses on necessary imaging before revascularization for claudication. Appropriate use of ultrasound, invasive arteriography, MR angiography, and CT angiography are discussed. The ACR Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision process support the systematic analysis of the medical literature from peer reviewed journals. Established methodology principles such as Grading of Recommendations Assessment, Development, and Evaluation or GRADE are adapted to evaluate the evidence. The RAND/UCLA Appropriateness Method User Manual provides the methodology to determine the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where peer reviewed literature is lacking or equivocal, experts may be the primary evidentiary source available to formulate a recommendation.
Topics: Humans; Societies, Medical; Evidence-Based Medicine; Intermittent Claudication; Angiography; Peripheral Arterial Disease; Lower Extremity
PubMed: 36436963
DOI: 10.1016/j.jacr.2022.09.002 -
Experimental Biology and Medicine... Oct 2021Optical coherence tomography angiography (OCTA) offers a noninvasive label-free solution for imaging retinal vasculatures at the capillary level resolution. In... (Review)
Review
Optical coherence tomography angiography (OCTA) offers a noninvasive label-free solution for imaging retinal vasculatures at the capillary level resolution. In principle, improved resolution implies a better chance to reveal subtle microvascular distortions associated with eye diseases that are asymptomatic in early stages. However, massive screening requires experienced clinicians to manually examine retinal images, which may result in human error and hinder objective screening. Recently, quantitative OCTA features have been developed to standardize and document retinal vascular changes. The feasibility of using quantitative OCTA features for machine learning classification of different retinopathies has been demonstrated. Deep learning-based applications have also been explored for automatic OCTA image analysis and disease classification. In this article, we summarize recent developments of quantitative OCTA features, machine learning image analysis, and classification.
Topics: Angiography; Capillaries; Deep Learning; Humans; Image Processing, Computer-Assisted; Retinal Diseases; Retinal Vessels; Tomography, Optical Coherence
PubMed: 34279136
DOI: 10.1177/15353702211026581