نتایج جستجو برای: Tortuosity

تعداد نتایج: 2064  

2017
Hai-Feng Wang Da-Ming Wang Jun-Jie Wang Li-Jun Wang Jun Lu Peng Qi Shen Hu Xi-Meng Yang Kun-Peng Chen

BACKGROUND Extracranial internal carotid artery (eICA) tortuosity may trigger cerebral ischemia, and body mass index (BMI) is a measure of body mass based on height and weight. The main purpose of this study is to determine the influence of BMI on the tortuosity of eICA. METHODS A total of 926 carotid artery angiograms were performed in 513 patients, of which 116 cases and matched controls we...

Journal: :Proceedings : a conference of the American Medical Informatics Association. AMIA Fall Symposium 1997
William E. Hart Michael H. Goldbaum Brad Côté Paul Kube Mark R. Nelson

Automatic measurement of blood vessel tortuosity is a useful capability for automatic ophthalmological diagnostic tools. We describe a suite of automated tortuosity measures for blood vessel segments extracted from RGB retinal images. The tortuosity measures were evaluated in two classification tasks: (1) classifying the tortuosity of blood vessel segments and (2) classifying the tortuosity of ...

Journal: :Investigative ophthalmology & visual science 2015
Neil Lagali Enea Poletti Dipika V Patel Charles N J McGhee Pedram Hamrah Ahmad Kheirkhah Mitra Tavakoli Ioannis N Petropoulos Rayaz A Malik Tor Paaske Utheim Andrey Zhivov Oliver Stachs Karen Falke Sabine Peschel Rudolf Guthoff Cecilia Chao Blanka Golebiowski Fiona Stapleton Alfredo Ruggeri

PURPOSE We examined agreement among experts in the assessment of corneal subbasal nerve tortuosity. METHODS Images of corneal subbasal nerves were obtained from investigators at seven sites (Auckland, Boston, Linköping, Manchester, Oslo, Rostock, and Sydney) using laser-scanning in vivo confocal microscopy. A set of 30 images was assembled and ordered by increasing tortuosity by 10 expert gra...

2016
Roberto Annunziata Ahmad Kheirkhah Shruti Aggarwal Bernardo M. Cavalcanti Pedram Hamrah Emanuele Trucco

PURPOSE To assess the performance of a novel system for automated tortuosity estimation and interpretation. METHODS A supervised strategy (driven by observers' grading) was employed to automatically identify the combination of tortuosity measures (i.e., tortuosity representation) leading to the best agreement with the observers. We investigated 18 tortuosity measures including curvature and d...

2003
Enrico Grisan Marco Foracchia Alfredo Ruggeri

Tortuosity is among the first alterations in retinal vessel network to appear in many retinopathies. Automatic evaluation of retinal vessel tortuosity is thus a valuable tool for early detection of vascular suffering. Quite a few techniques for tortuosity measurement and classification have been proposed, but they do not always match the clinical concept of tortuosity. This justifies the need f...

1999
William E. Hart Michael Goldbaum Mark R. Nelson

Automatic measurement of blood vessel tortuosity is a useful capability for automatic ophthal-mological diagnostic tools. We describe a suite of automated tortuosity measures for blood vessel segments extracted from RGB retinal images. The tortuosity measures were evaluated in two classii-cation tasks: (1) classifying the tortuosity of blood vessel segments and (2) classifying the tortuosity of...

Journal: :Circulation. Cardiovascular interventions 2014
Mackram F Eleid Raviteja R Guddeti Marysia S Tweet Amir Lerman Mandeep Singh Patricia J Best Terri J Vrtiska Megha Prasad Charanjit S Rihal Sharonne N Hayes Rajiv Gulati

BACKGROUND Spontaneous coronary artery dissection (SCAD) is an increasingly recognized nonatherosclerotic cause of acute coronary syndrome. The angiographic characteristics of SCAD are largely undetermined. The goal of this study was to determine the prevalence of coronary tortuosity in SCAD and whether it may be implicated in the disease. METHODS AND RESULTS Patients with confirmed SCAD (n=2...

Journal: :International journal of medical informatics 1999
William E. Hart Michael H. Goldbaum Brad Côté Paul Kube Mark R. Nelson

Automatic measurement of blood vessel tortuosity is a useful capability for automatic ophthalmological diagnostic tools. We describe a suite of automated tortuosity measures for blood vessel segments extracted from RGB retinal images. The tortuosity measures were evaluated in two classification tasks: (1) classifying the tortuosity of blood vessel segments and (2) classifying the tortuosity of ...

Journal: :Australian Journal of Chemistry 1958

Journal: :Hypertension 2019

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