21,105 results match your criteria angiography images


Coronary Inflammation Assessed by Perivascular Fat Attenuation Index in Patients with Psoriasis: A Propensity Score-Matched Study.

Dermatology 2021 Sep 15:1-9. Epub 2021 Sep 15.

Department of Radiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Objectives: This study aimed to evaluate coronary inflammation by measuring the perivascular fat attenuation index (FAI) and quantify the atherosclerosis burden in patients with psoriasis and control individuals without psoriasis based on coronary computed tomography angiography (CCTA) images.

Methods: A total of 98 consecutive patients with psoriasis (76 male [77.6%], aged 56. Read More

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September 2021

Pulmonary vasculitis in Hughes-Stovin syndrome (HSS): a reference atlas and computed tomography pulmonary angiography guide-a report by the HSS International Study Group.

Clin Rheumatol 2021 Sep 17. Epub 2021 Sep 17.

Serviço de Reumatologia, Hospital das Clínicas, Faculdade de Medicina, Universidade Federal de Goiás, Goiânia, GO, Brazil.

Introduction: Hughes-Stovin syndrome (HSS) is a systemic vasculitis characterized by widespread venous/arterial thrombosis and pulmonary artery aneurysms (PAAs), which is associated with serious morbidity and mortality. All fatalities reported in HSS resulted from unpredictable fatal suffocating hemoptysis. Therefore, it is necessary to recognize pulmonary complications at an early stage of the disease. Read More

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September 2021

Mouse model of experimental pulmonary hypertension: Lung angiogram and right heart catheterization.

Pulm Circ 2021 Oct-Dec;11(4):20458940211041512. Epub 2021 Sep 8.

Section of Physiology, University of California, San Diego, La Jolla, CA, USA.

Pulmonary arterial hypertension is a progressive and fatal disease and rodents with experimental pulmonary hypertension (PH) are often used to study pathogenic mechanisms, identify therapeutic targets, and develop novel drugs for treatment. Here we describe a hands-on set of experimental approaches including ex vivo lung angiography and histology and in vivo right heart catheterization (RHC) to phenotypically characterize pulmonary hemodynamics and lung vascular structure in normal mice and mice with experimental PH. We utilized Microfil polymer as contrast in our ex vivo lung angiogram to quantitatively examine pulmonary vascular remodeling in mice with experimental PH, and lung histology to estimate pulmonary artery wall thickness. Read More

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September 2021

Relationship between cerebral aneurysms and variations in cerebral basal arterial network: a morphometric cross-sectional study in Computed Tomography Angiograms from a neurointerventional unit.

BMJ Open 2021 Sep 16;11(9):e051028. Epub 2021 Sep 16.

Institute of Evolutionary Medicine, University of Zurich, Zurich, Switzerland.

Objective: Segments of cerebral basal arterial network (CBAN) dampen the peak pressure in blood flowing through these arteries, thus minimising the chances of development of cerebral aneurysms. The objective of this research was to find the relationship of occurrence of intracranial aneurysms to variations of the components of the CBAN.

Design And Setting: This is an observational, quantitative and retrospective research, which used cerebral CT angiography (CCTA) images. Read More

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September 2021

Left atrial appendage orifice area and morphology is closely associated with flow velocity in patients with nonvalvular atrial fibrillation.

BMC Cardiovasc Disord 2021 Sep 16;21(1):442. Epub 2021 Sep 16.

Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221002, Jiangsu, China.

Background: Thromboembolic events are the most serious complication of atrial fibrillation (AF), and the left atrial appendage (LAA) is the most important site of thrombosis in patients with AF. During the period of COVID-19, a non-invasive left atrial appendage detection method is particularly important in order to reduce the exposure of the virus. This study used CT three-dimensional reconstruction methods to explore the relationship between LAA morphology, LAA orifice area and its mechanical function in patients with non-valvular atrial fibrillation (NVAF). Read More

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September 2021

Association of coronary artery calcium score with qualitatively and quantitatively assessed adverse plaque on coronary CT angiography in the SCOT-HEART trial.

Eur Heart J Cardiovasc Imaging 2021 Sep 16. Epub 2021 Sep 16.

BHF Centre for Cardiovascular Science, University of Edinburgh, Chancellor's Building, 49 Little France Crescent, Edinburgh, EH164SB, UK.

Aims: Coronary artery calcification is a marker of cardiovascular risk, but its association with qualitatively and quantitatively assessed plaque subtypes is unknown.

Methods And Results: In this post-hoc analysis, computed tomography (CT) images and 5-year clinical outcomes were assessed in SCOT-HEART trial participants. Agatston coronary artery calcium score (CACS) was measured on non-contrast CT and was stratified as zero (0 Agatston units, AU), minimal (1-9 AU), low (10-99 AU), moderate (100-399 AU), high (400-999 AU), and very high (≥1000 AU). Read More

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September 2021

Peripapillary Microvascularization Analysis Using Swept-Source Optical Coherence Tomography Angiography in Optic Chiasmal Compression.

J Ophthalmol 2021 4;2021:5531959. Epub 2021 Sep 4.

Department of Ophthalmology, University Hospital, Dijon, France.

Purpose: To evaluate the vessel density (VD) of the radial peripapillary capillary (RPC) network using swept-source optical coherence tomography angiography (SS-OCTA) "en face" images of eyes with chiasmal compression caused by brain tumors before and after decompressive surgery compared with healthy controls.

Methods: A cross-sectional study was conducted in 12 patients with chiasmal compression confirmed by neuroimaging. Sixteen healthy participants were also included. Read More

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September 2021

Takotsubo syndrome during surgery for pheochromocytoma: an unexpected complication.

Oxf Med Case Reports 2021 Sep 13;2021(9):omab087. Epub 2021 Sep 13.

Carol Davila University of Medicine and Pharmacy, Bucharest, Romania.

Takotsubo syndrome is a rare cause of systolic dysfunction and can be found as a clinical manifestation of pheochromocytoma. We present a case of rapid onset of systolic dysfunction with cardiogenic shock, which developed after the surgical excision of an adrenal gland tumor in a 60-year-old male. Coronary angiography excluded coronary artery disease. Read More

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September 2021

Research on the Segmentation of Biomarker for Chronic Central Serous Chorioretinopathy Based on Multimodal Fundus Image.

Dis Markers 2021 3;2021:1040675. Epub 2021 Sep 3.

The Affiliated Eye Hospital of Nanjing Medical University, Nanjing 210029, China.

At present, laser surgery is one of the effective ways to treat the chronic central serous chorioretinopathy (CSCR), in which the location of the leakage area is of great importance. In order to alleviate the pressure on ophthalmologists to manually label the biomarkers as well as elevate the biomarker segmentation quality, a semiautomatic biomarker segmentation method is proposed in this paper, aiming to facilitate the accurate and rapid acquisition of biomarker location information. Firstly, the multimodal fundus images are introduced into the biomarker segmentation task, which can effectively weaken the interference of highlighted vessels in the angiography images to the location of biomarkers. Read More

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September 2021

CT-derived fractional flow reserve (FFRct) for functional coronary artery evaluation in the follow-up of patients after heart transplantation.

Eur Radiol 2021 Sep 15. Epub 2021 Sep 15.

Department of Cardiology, Thorax Center, Erasmus MC, University Medical Center Rotterdam, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands.

Objectives: Invasively measured fractional flow reserve (FFR) is associated with outcome in heart transplant (HTx) patients. Coronary computed tomography angiography (CCTA)-derived FFR (FFRct) provides additional functional information from anatomical CT images. We describe the first use of FFRct in HTx patients. Read More

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September 2021

Longitudinal choriocapillaris changes in the presence of reticular pseudodrusen.

Sci Rep 2021 Sep 14;11(1):18227. Epub 2021 Sep 14.

Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany.

To determine longitudinal changes in choriocapillaris (CC) measures in eyes with reticular pseudodrusen (RPD) using optical coherence tomography angiography (OCTA). In this observational prospective study, 20 patients with exclusively RPD and no other alteration due to age-related macular degeneration were included. Eight RPD patients were re-examined at 5-year follow-up. Read More

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September 2021

CT pulmonary angiography appropriateness in a single emergency department: does the use of revised Geneva score matter?

Radiol Med 2021 Sep 13. Epub 2021 Sep 13.

Interdisciplinary Department of Medicine, Section of Diagnostic Imaging, University of Bari Medical School "Aldo Moro", Piazza Giulio Cesare 11, 70124, Bari, Italy.

Purpose: To assess the percentage of computed tomography pulmonary angiography (CTPA) procedures that could have been avoided by methodical application of the Revised Geneva Score (RGS) coupled with age-adjusted D-dimer cut-offs rather than only clinical judgment in Emergency Department patients with suspected pulmonary embolism (PE).

Material And Methods: Between November 2019 and May 2020, 437 patients with suspected PE based on symptoms and D-dimer test were included in this study. All patients underwent to CTPA. Read More

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September 2021

Nonexudative morphologic changes of neovascularization on optical coherence tomography angiography as predictive factors for exudative recurrence in age-related macular degeneration.

Graefes Arch Clin Exp Ophthalmol 2021 Sep 13. Epub 2021 Sep 13.

Kim's Eye Hospital, Konyang University College of Medicine, 156, 4ga, Yeongdeungpo-dong, Yeongdeungpo-gu, Seoul, South Korea.

Purpose: To evaluate morphologic changes of choroidal neovascularization (CNV) on optical coherence tomography angiography (OCTA) during the nonexudative period and to correlate the features and timing of recurrence in neovascular age-related macular degeneration. (AMD).

Methods: Two hundred thirty-eight eyes with type 1 CNV were retrospectively reviewed. Read More

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September 2021

Partial Thrombosis of Inferior Mesenteric Vein With Thrombophlebitis.

Cureus 2021 Aug 5;13(8):e16900. Epub 2021 Aug 5.

Internal Medicine, Aventura Hospital and Medical Center, Miami, USA.

Inferior mesenteric vein thrombosis (IMVT) is a rare entity that can lead to a potentially lethal event unless recognized early in the disease. Although its prevalence is low, IMVT presents mainly in certain conditions such as in inflammatory processes like diverticulitis, arrhythmias, hypercoagulable states, connective tissue disorders, malignancy, or hereditary thrombophilias.  Mesenteric venous thrombophlebitis is a condition in which a blood clot in a vein causes inflammation and pain. Read More

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Application of High-Resolution Flat Detector Computed Tomography in Stent Implantation for Intracranial Atherosclerotic Stenosis.

Front Neurosci 2021 27;15:655594. Epub 2021 Aug 27.

Department of Radiology, University of Washington, Seattle, WA, United States.

Objective: To evaluate the utility of high-resolution flat-detector computed tomography (HR-FDCT) compared with conventional flat-detector computed tomography (FDCT) for stent placement in symptomatic intracranial atherosclerotic stenosis (ICAS).

Methods: We retrospectively reviewed the clinical data of 116 patients with symptomatic ICAS who underwent stent implantation. Images were acquired using conventional FDCT [voxel size = 0. Read More

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Examination of Age-Related Retinal Vascular Changes in the Macula Using Optical Coherence Tomography Angiography of the Eyes After Cataract Surgery.

Clin Ophthalmol 2021 1;15:3687-3695. Epub 2021 Sep 1.

Department of Ophthalmology, Saitama Medical University, Iruma, Saitama, Japan.

Purpose: Optical coherence tomography angiography (OCTA) allows noninvasive observation of the retinal vasculature, and image analysis can be used to calculate the retinal vessel density and foveal avascular zone (FAZ) area. A previous study showed that macular vessel density and the signal strength index (SSI) of OCTA images increased significantly after cataract surgery. However, the effect of aging on OCTA analysis remains unclear. Read More

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September 2021

Deep learning models for benign and malign ocular tumor growth estimation.

Authors:
Mayank Goswami

Comput Med Imaging Graph 2021 Sep 8;93:101986. Epub 2021 Sep 8.

Divyadrishti Imaging Laboratory, Department of Physics, Indian Institute of Technology Roorkee, Roorkee, India. Electronic address:

Relatively abundant availability of medical imaging data has provided significant support in the development and testing of Neural Network based image processing methods. Clinicians often face issues in selecting suitable image processing algorithm for medical imaging data. A strategy for the selection of a proper model is presented here. Read More

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September 2021

AngioNet: a convolutional neural network for vessel segmentation in X-ray angiography.

Sci Rep 2021 Sep 10;11(1):18066. Epub 2021 Sep 10.

University of Michigan, 500 S State St, Ann Arbor, MI, 48109, USA.

Coronary Artery Disease (CAD) is commonly diagnosed using X-ray angiography, in which images are taken as radio-opaque dye is flushed through the coronary vessels to visualize the severity of vessel narrowing, or stenosis. Cardiologists typically use visual estimation to approximate the percent diameter reduction of the stenosis, and this directs therapies like stent placement. A fully automatic method to segment the vessels would eliminate potential subjectivity and provide a quantitative and systematic measurement of diameter reduction. Read More

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September 2021

Anatomical Variations in Circle of Willis in Patients Undergoing CT Cerebral Angiography in a Tertiary Hospital in Nepal: A Descriptive Cross-sectional Study.

JNMA J Nepal Med Assoc 2020 Dec 31;58(232):1065-1068. Epub 2020 Dec 31.

Department of Radiology, Nepal Mediciti Hospital, Lalitpur, Nepal.

Introduction: Variation in Circle of Willis is a commonly encountered entity in patients undergoing computed tomography angiography, identification of which is crucial in the management of patients with vascular pathologies. The aim of the study was to find out the anatomical variations in the Circle of Willis in patients undergoing Computed Tomography cerebral angiography in a tertiary hospital in Nepal.

Methods: This is a descriptive cross-sectional study involving 95 patients using convenient sampling techniques who were sent to the Department of Radiology and Imaging, Tribhuvan University Teaching hospital, for further evaluation of suspected vascular pathologies in the brain from April 2017 to September 2017. Read More

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December 2020

Optical coherence tomography angiography of central serous chorioretinopathy: quantitative evaluation of the vascular pattern and capillary flow density.

Graefes Arch Clin Exp Ophthalmol 2021 Sep 10. Epub 2021 Sep 10.

Eye Clinic, Department of Surgical Sciences, University of Cagliari, Via Ospedale, 46, 09124, Cagliari, CA, Italy.

Background: This study aimed to evaluate the vascular pattern and capillary flow density (CFD) map on optical coherence tomography angiography (OCTA) images of patients affected by central serous chorioretinopathy (CSC).

Methods: In this retrospective cohort study, OCTA (AngioVue RTVue XR Avanti, Optovue) 3 × 3 mm macula scans of both eyes of patients with CSC were taken at baseline; the images were segmented and compared with OCTA scans of fellow eyes without CSC as well as age-matched healthy subjects. OCTA images were processed by quantitative textural analysis (ImageJ software) to provide an objective grading of choroidal capillary alterations. Read More

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September 2021

Pedicled anterolateral thigh flap transfer for the reconstruction of a large gluteal defect assisted by preoperative computed tomographic angiography and intraoperative indocyanine green angiography: A case report.

Microsurgery 2021 Sep 10. Epub 2021 Sep 10.

Department of Plastic and Reconstructive Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, Tokyo, Japan.

The efficacy of the use of the pedicled ALT flap for buttock defects has not been established in the literature. Here, we present a case of a successful reconstruction of a large gluteal defect after sarcoma resection using a pedicled ALT flap assisted by preoperative computed tomographic angiography (CTA) and intraoperative indocyanine green (ICG) angiography. A 94-year-old man underwent resection of a large soft tissue tumor in the gluteal region resulting in a 19 × 15 cm defect. Read More

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September 2021

Macular, papillary and peripapillary perfusion densities measured with optical coherence tomography angiography in primary open angle glaucoma and pseudoexfoliation glaucoma.

Graefes Arch Clin Exp Ophthalmol 2021 Sep 9. Epub 2021 Sep 9.

Department of Ophthalmology, Campus Virchow Klinikum, Charité - University Medicine Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany.

Purpose: To compare the blood flow situation in primary open-angle glaucoma (POAG) and pseudoexfoliation glaucoma (PXG) using optical coherence tomography angiography (OCTA).

Methods: In this prospective study a total of 26 POAG and 23 PXG eyes were included. All patients underwent a complete ophthalmological examination including standard automated perimetry, stereoscopic photographs of the optic disc, peripapillary retinal nerve fibre layer analysis and examination of vascular parameters of the optic nerve head (ONH), the peripapillary region and macula using OCTA. Read More

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September 2021

Ultra-High-Resolution Coronary CT Angiography for Assessment of Patients with Severe Coronary Artery Calcification: Initial Experience.

Radiol Cardiothorac Imaging 2021 Aug 26;3(4):e210053. Epub 2021 Aug 26.

Division of Cardiology, Department of Medicine, and Department of Radiology, Johns Hopkins University School of Medicine, 600 N Wolfe St, Halsted 562, Baltimore, MD 21287-0025.

Purpose: Conventional CT technology yields only modest accuracy of coronary artery stenosis assessment in severely calcified lesions. Reported herein are this study's initial observations on the potential of ultra-high-resolution CT (UHR-CT) for evaluating severely calcified coronary arterial lesions.

Materials And Methods: Fifteen patients 45 years of age or older, with history of coronary artery disease, referred for invasive coronary angiography, were prospectively enrolled. Read More

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Anatomic Variations of the Hepatic Artery in 5625 Patients.

Radiol Cardiothorac Imaging 2021 Aug 19;3(4):e210007. Epub 2021 Aug 19.

Department of Radiology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Republic of Korea.

Purpose: To analyze the origin and anatomic course of the hepatic arteries by using digital subtraction angiography (DSA) and multidetector CT in a large study sample.

Materials And Methods: This retrospective study included 5625 patients who underwent liver CT and chemoembolization between January 2005 and December 2018 (mean age, 60 years ± 11 [range, 11-99 years]; 4464 males). The CT and DSA images were reviewed to evaluate the visceral arterial anatomy for variations in the celiac axis and hepatic arteries. Read More

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Prediction of trabecular meshwork-targeted micro-invasive glaucoma surgery outcomes using anterior segment OCT angiography.

Sci Rep 2021 Sep 8;11(1):17850. Epub 2021 Sep 8.

Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan.

We performed a prospective, longitudinal study to investigate the association between the preoperative intrascleral vasculature assessed using anterior segment (AS)-optical coherence tomography angiography (OCTA) and surgical outcomes of trabecular meshwork-targeted micro- or minimally invasive glaucoma surgery (MIGS). We included 37 patients with primary open-angle glaucoma. Preoperative AS-OCTA images of the sclero-conjunctiva of the nasal corneal limbus were acquired in the superficial (conjunctival) and deep (intrascleral) layers. Read More

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September 2021

Clinical features and prognosis of polypoidal choroidal vasculopathy with different morphologies of branching vascular network on optical coherence tomography angiography.

Sci Rep 2021 Sep 8;11(1):17848. Epub 2021 Sep 8.

Department of Ophthalmology, National Taiwan University Hospital, Taipei, Taiwan.

This study highlights the clinical features and treatment response of polypoidal choroidal vasculopathy (PCV) among three different branching vascular network (BVN) morphologies in optical coherence tomography angiography (OCTA), and further correlates the BVN features with those under fluorescent angiography (FA) and indocyanine green angiography (ICGA). In total, we reviewed 70 eyes with PCV followed up for > 12 months. OCTA, ICGA and FA images were obtained at baseline and post-treatments. Read More

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September 2021

Computer-aided Pulmonary Embolism Detection on Virtual Monochromatic Images Compared to Conventional CT Angiography.

Radiology 2021 Sep 7:204620. Epub 2021 Sep 7.

From the Departments of Radiology (E.L.W., I.M.N., E.d.B., J.N.O., L.H., I.R., M.F.B.) and Pulmonology (S.W., J.W.K.v.d.B.), Isala Hospital, Dokter van Heesweg 2, 8025 AB Zwolle, the Netherlands; and Department of Radiology, University Medical Centre Utrecht, Utrecht, the Netherlands (P.A.d.J.).

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September 2021

Deep learning-based Hounsfield unit value measurement method for bolus tracking images in cerebral computed tomography angiography.

Comput Biol Med 2021 Sep 2;137:104824. Epub 2021 Sep 2.

Department of Radiology, Kindai University Faculty of Medicine, 377-2 Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan. Electronic address:

Background: Patient movement during bolus tracking (BT) impairs the accuracy of Hounsfield unit (HU) measurements. This study assesses the accuracy of measuring HU values in the internal carotid artery (ICA) using an original deep learning (DL)-based method as compared with using the conventional region of interest (ROI) setting method.

Method: A total of 722 BT images of 127 patients who underwent cerebral computed tomography angiography were selected retrospectively and divided into groups for training data, validation data, and test data. Read More

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September 2021

Macular Vascular Density Analysis Using Adobe Photoshop Software In Diabetic Eyes: Optical Coherence Tomography Angiography Study.

J Ayub Med Coll Abbottabad 2021 Jul-Sep;33(3):441-446

Department of Biotechnology and Genetic Engineering, University of Agriculture, Peshawar, Pakistan.

Background: Optical Coherence Tomography Angiography (OCTA) is dye less microvascular visualizing technique. In study we binaries OCTA images of macular vessels in healthy and diabetic subjects without macular oedema using Adobe Photoshop CS3 extended version.

Methods: Prospective, single centered, observational study total of 58 eyes of 108 Diabetic Retinopathy (DR) subjects and 20 eyes of 40 normal subjects with mean age of 58. Read More

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September 2021

A review on segmentation of lung parenchyma based on deep learning methods.

J Xray Sci Technol 2021 Aug 28. Epub 2021 Aug 28.

Key Laboratory of Intelligent Computing in Medical Image, Ministry of Education, Shenyang, China.

Precise segmentation of lung parenchyma is essential for effective analysis of the lung. Due to the obvious contrast and large regional area compared to other tissues in the chest, lung tissue is less difficult to segment. Special attention to details of lung segmentation is also needed. Read More

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