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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 -
Neuroimaging Clinics of North America Nov 2019This article reviews the arterial and venous anatomy of the spine and spinal cord. Special emphasis is placed on vessels critical to the conduct and interpretation of... (Review)
Review
This article reviews the arterial and venous anatomy of the spine and spinal cord. Special emphasis is placed on vessels critical to the conduct and interpretation of spinal angiography, notably the intersegmental artery and its cranial and caudal derivatives: the vertebral, supreme intercostal, and sacral arteries.
Topics: Angiography; Humans; Spinal Cord
PubMed: 31677734
DOI: 10.1016/j.nic.2019.07.007 -
Methods in Molecular Biology (Clifton,... 2023Following its implementation in the 1960s, fluorescein angiography (FA) has become a widely used and reliable tool in the diagnosis of retinal and choroidal disorders....
Following its implementation in the 1960s, fluorescein angiography (FA) has become a widely used and reliable tool in the diagnosis of retinal and choroidal disorders. FA is an imaging modality utilized to examine the circulation of the retina and choroid. Here, we describe the process of obtaining fundus images with sodium fluorescein dye as a contrast agent. Using this methodology, ophthalmologists may examine the retinal and choroidal vasculature to diagnose a wide scope of retinal and choroidal diseases.
Topics: Fluorescein; Fluorescein Angiography
PubMed: 36481893
DOI: 10.1007/978-1-0716-2651-1_15 -
Optics Letters May 2022We report a method to image facial cutaneous microvascular perfusion using wide-field imaging photoplethysmography (iPPG) and handheld swept-source optical coherence...
We report a method to image facial cutaneous microvascular perfusion using wide-field imaging photoplethysmography (iPPG) and handheld swept-source optical coherence tomography (OCT). The iPPG system employs a 16-bit-depth camera to provide a 2D wide-field blood pulsation map that is then used as a positioning guidance for OCT imaging of cutaneous microvasculature. We show the results from iPPG and OCT to demonstrate the ability of guided imaging of cutaneous microvasculature, which is potentially useful for the assessment of skin conditions in dermatology and cosmetology.
Topics: Angiography; Microvessels; Photoplethysmography; Tomography, Optical Coherence
PubMed: 35486784
DOI: 10.1364/OL.452326 -
Handbook of Clinical Neurology 2021This chapter outlines recent advances in imaging of disorders of the cervicocerebral vasculature that permit evaluation of the lumen, the vessel wall, and the patterns... (Review)
Review
This chapter outlines recent advances in imaging of disorders of the cervicocerebral vasculature that permit evaluation of the lumen, the vessel wall, and the patterns of blood flow within the vessel. Noninvasive MR techniques to evaluate the vessel lumen, such as noncontrast time-of-flight magnetic resonance angiography and contrast-enhanced magnetic resonance angiography (CEMRA) are routinely used in diagnosis, planning, and posttreatment follow-up. More recently, high-resolution vessel wall imaging MRI (VWMRI) has been developed, which provides additional information about the vessel wall or aneurysm wall. VWMRI wall signal and enhancement patterns may permit differentiation between vasculopathies and between stable and unstable unruptured aneurysms. In addition, the study of blood flow patterns using phase-contrast MRI (4D flow MRI) and image-based computational fluid dynamics has been used to characterize flow and wall shear stress within aneurysms, flow within arteriovenous malformations (AVMs) and pulsatile tinnitus. Digital subtraction angiography (DSA), however, remains the gold standard in the evaluation and treatment of neurovascular diseases. New adjunctive DSA techniques, such as 4D-DSA reconstruction and color flow analysis, are also covered. These new MRI and DSA techniques increase diagnostic accuracy, improve understanding of the pathophysiology and natural history of neurovascular disease, inform and guide treatment, and may provide risk stratification for patients being considered for therapy.
Topics: Aneurysm; Angiography, Digital Subtraction; Contrast Media; Humans; Intracranial Aneurysm; Magnetic Resonance Angiography; Magnetic Resonance Imaging
PubMed: 33272412
DOI: 10.1016/B978-0-444-64034-5.00016-X -
The Journal of Knee Surgery Apr 2020Knee dislocations (KDs) are frequently found in high-energy impact injuries, ranging from automobile accidents to contact sports. KDs require careful examination due to... (Review)
Review
Knee dislocations (KDs) are frequently found in high-energy impact injuries, ranging from automobile accidents to contact sports. KDs require careful examination due to the limb-threatening nature of these injuries. A key examination in any KD comprises a proper assessment of the vascular status. The risk of popliteal artery injury with a KD has varied from 7 to 40%, with more contemporary studies reporting injury in the range of 7 to 15%. The notion of mandatory emergent arteriography was challenged in the trauma literature as several small retrospective studies suggested that selective arteriography was a safe and effective treatment protocol. New imaging modalities have evolved and have found their way into trauma surgery. Computed tomography angiography and magnetic resonance angiography are two contemporary imaging modalities that have different characteristics as well as availability. Arteriography has been the gold standard and is a reliable and proven method of evaluation. However, it has a number of negative aspects that must be considered when determining the ideal imaging for a patient following KD. Besides cost savings of about more than US$500,000, conventional arteriography, which comprises the use of X-ray, arterial puncture and cannulation, and the use of contrast agents containing iodine, has got a complication rate as high as 9% and more patient discomfort compared with the new imaging modalities. This clinical practice review documents that our algorithm of clinical examination first combined with advanced imaging in cases with abnormalities documented on examination is a safe and prudent policy in treating patients following KD.
Topics: Algorithms; Computed Tomography Angiography; Humans; Knee Dislocation; Magnetic Resonance Angiography; Physical Examination; Practice Patterns, Physicians'; Vascular System Injuries
PubMed: 31986532
DOI: 10.1055/s-0040-1701210 -
Clinical Radiology Apr 2020The incidence of cerebral venous thrombosis (CVT) is increasing due to the widespread use of computed tomography (CT) and magnetic resonance imaging (MRI) for... (Review)
Review
The incidence of cerebral venous thrombosis (CVT) is increasing due to the widespread use of computed tomography (CT) and magnetic resonance imaging (MRI) for investigating patients with acute headaches and new onset of seizures. Alternatively referred to as cerebral venous sinus thrombosis (CVST) or dural venous sinus thrombosis (DVST), the terms encompass a broad spectrum of neurological pathologies. These include dural venous sinus thrombosis, cortical vein thrombosis, cavernous sinus thrombosis, venous infarction/haemorrhage, and the rare sequelae of intracranial hypertension or dural arteriovenous fistula. Timely and accurate diagnosis is critical; most patients are young adults and up to 15% will die in the acute phase of the condition. Imaging diagnosis using unenhanced CT or CT venography (CTV) can be readily achieved by the general radiologist. MRI or MRI venography (MRV) are powerful techniques, provided the radiologist is aware of critical diagnostic pitfalls. In selected cases, cerebral digital subtraction angiography (DSA) can facilitate both diagnosis and anticoagulant/transcatheter thrombolytic therapy improving clinical outcome. This article will outline the condition, highlighting cerebral venous anatomy, diagnostic techniques, and pitfalls pertinent to all practising radiologists.
Topics: Angiography, Digital Subtraction; Cerebral Angiography; Cerebral Veins; Computed Tomography Angiography; Contrast Media; Diagnosis, Differential; Humans; Intracranial Thrombosis; Magnetic Resonance Angiography
PubMed: 31980184
DOI: 10.1016/j.crad.2019.12.009 -
Clinical Neurology and Neurosurgery Nov 2022Moyamoya angiopathy (MMA) is a rare condition characterized by steno-occlusion of terminal portions of the internal carotid arteries and/or their proximal branches with... (Review)
Review
Moyamoya angiopathy (MMA) is a rare condition characterized by steno-occlusion of terminal portions of the internal carotid arteries and/or their proximal branches with the formation of collateral vessels network (moyamoya vessels). These changes result in chronic ischemia of the brain parenchyma with subsequent serious cerebrovascular accidents. The prognosis of MMA could be dramatically improved if the diagnosis and assessment are prompt and accurate. It is also crucial to define the indications, optimal timing, volume, and tactics of revascularization surgery, as well as longitudinal observation after treatment. It is therefore necessary to use strict criteria for decision making, including radiological criteria. In today's world, neuroimaging is a valuable diagnostic tool that continually evolves and provides us with more and more information about structural and functional changes in different pathological conditions. However, due to MMA's rarity, its neuroimaging can be challenging. The purpose of this review is to summarize a contemporary knowledge regarding neuroimaging in patients with MMA and to discuss the main difficulties associated with visualizing this condition.
Topics: Humans; Angiography, Digital Subtraction; Moyamoya Disease; Cerebral Angiography; Neuroimaging; Brain; Magnetic Resonance Angiography
PubMed: 36265242
DOI: 10.1016/j.clineuro.2022.107471 -
Journal of Nuclear Cardiology :... Aug 2021
Topics: Coronary Angiography; Gated Blood-Pool Imaging; Heart Diseases; Humans; Radionuclide Angiography; Reproducibility of Results; Stroke Volume
PubMed: 31482533
DOI: 10.1007/s12350-019-01876-9 -
European Journal of Ophthalmology May 2022To report visual, clinical and radiological outcomes of three patients with fibromuscular dysplasia (FMD) that presented different ocular ischemic events, supported by...
PURPOSE
To report visual, clinical and radiological outcomes of three patients with fibromuscular dysplasia (FMD) that presented different ocular ischemic events, supported by different multimodal imaging.
METHODS
A retrospective study including patients who attended a tertiary referral hospital from July 2016 to June 2019 referring acute visual loss and later diagnosed of FMD. Ophthalmological examination included best corrected visual acuity (BCVA), biomicroscopy, fundoscopy, fluorescein angiography (FA), and macular and retinal nerve fiber layer spectral domain optic coherence tomography (SD-OCT). Patients were admitted by the Neurology service, completing the study with blood and cerebrospinal fluid (CSF) test, serology and cultures, cerebral magnetic resonance angiography (angioMRI), and arteriography.
RESULTS
Three patients were included; one male and second females. All referred unilateral acute visual loss, with BCVA of counting fingers or hand-motion. Relative afferent pupilar defect was present in all patients. Two patients associated neurological focal signs and one had chronic hypertension. Fundoscopy revealed hemorrhages and exudates in all patients, and the typical sign of "string-of-beads" in one. FA showed dye filling delay and macular and peripheral hypofluorescence. SD-OCT revealed acute and chronic retinal ischemic signs. Blood and CSF tests, serologies and cultures resulted negative. All presented cerebral vascular involvement, objectified in the cerebral angioMRI or arteriography.
CONCLUSIONS
FMD should be considered in cases with unilateral sudden visual loss associated to neurological focal deficits in young patients. The typical "string-of-beads" image is rare in small arteries such as the retinal vasculature. When suspected, a complete ophthalmological examination and cerebral vascular imaging is essential to confirm the diagnosis.
Topics: Female; Fibromuscular Dysplasia; Fluorescein Angiography; Humans; Male; Ophthalmoscopy; Retrospective Studies; Tomography, Optical Coherence; Vision Disorders; Visual Acuity
PubMed: 34162267
DOI: 10.1177/11206721211027059