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https://www.readbyqxmd.com/read/28820891/scene-text-detection-via-extremal-region-based-double-threshold-convolutional-network-classification
#1
Wei Zhu, Jing Lou, Longtao Chen, Qingyuan Xia, Mingwu Ren
In this paper, we present a robust text detection approach in natural images which is based on region proposal mechanism. A powerful low-level detector named saliency enhanced-MSER extended from the widely-used MSER is proposed by incorporating saliency detection methods, which ensures a high recall rate. Given a natural image, character candidates are extracted from three channels in a perception-based illumination invariant color space by saliency-enhanced MSER algorithm. A discriminative convolutional neural network (CNN) is jointly trained with multi-level information including pixel-level and character-level information as character candidate classifier...
2017: PloS One
https://www.readbyqxmd.com/read/28818863/detection-of-left-ventricular-thrombus-by-cardiac-magnetic-resonance-in-embolic-stroke-of-undetermined-source
#2
Junji Takasugi, Hiroshi Yamagami, Teruo Noguchi, Yoshiaki Morita, Tomotaka Tanaka, Yoshinori Okuno, Satoshi Yasuda, Kazunori Toyoda, Yasufumi Gon, Kenichi Todo, Manabu Sakaguchi, Kazuyuki Nagatsuka
BACKGROUND AND PURPOSE: We aimed to use contrast-enhanced cardiac magnetic resonance (CE-CMR) imaging to elucidate the prevalence of left ventricular (LV) thrombus in patients suspected of embolic stroke of undetermined source (ESUS) with previous myocardial infarction or LV dysfunction (LV ejection fraction [LVEF] <50%). METHODS: We prospectively investigated 797 consecutive patients who presented to our hospital with acute ischemic stroke between 2014 and 2015...
August 17, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28818533/the-association-between-bouted-and-non-bouted-physical-activity-on-retinopathy-prevalence
#3
Emily Frith, Paul D Loprinzi
OBJECTIVE: We evaluated the specific differential association between non-bouted, lifestyle physical activities (vs. structured exercise; i.e., bouted physical activity) on retinopathy prevalence among a national sample of the broader U.S. adult population. METHODS: Data from the 2005-2006 National Health and Nutrition Examination Survey (NHANES) was used to identify 1501 adults, between 40 and 85years. Bouted and non-bouted physical activities were assessed using objective accelerometer monitoring...
August 14, 2017: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/28818358/black-toenail-sign-in-melas-syndrome
#4
Matthew T Whitehead, Michael Wien, Bonmyong Lee, Nancy Bass, Andrea Gropman
BACKGROUND: Mitochondrial encephalopathy with lactic acidosis and stroke-like episodes (MELAS) syndrome is a mitochondrial disorder often causing progressive brain injury that is not confined to large arterial territories. Severe insults ultimately lead to gyral necrosis affecting the cortex and juxtacortical white matter; the neuroimaging correlate is partial gyral signal suppression on T2/FLAIR sequences that resemble black toenails. We aimed to characterize the imaging features and the natural history of MELAS-related gyral necrosis...
July 12, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28818260/transcranial-doppler-monitoring-for-microemboli-a-marker-of-a-high-risk-carotid-plaque
#5
J David Spence
In the United States, 90% of carotid intervention is being performed for asymptomatic carotid stenosis, even though 90% of patients would be better treated with intensive medical therapy. This is being justified by comparing risks of stroke or death with medical therapy during clinical trials completed decades ago (approximately 2% per year) with risks of intervention with carotid artery stenting (CAS) versus carotid endarterectomy in recent trials that did not have a medical arm. Such extrapolations are, simply put, invalid...
March 2017: Seminars in Vascular Surgery
https://www.readbyqxmd.com/read/28818258/imaging-of-high-risk-carotid-plaques-ultrasound
#6
Rafael S Cires-Drouet, Mahvash Mozafarian, Amir Ali, Siddhartha Sikdar, Brajesh K Lal
Duplex ultrasonography has a well-established role in the assessment of the degree of stenosis caused by carotid atherosclerosis. This assessment is derived from Doppler velocity changes induced by the narrowing lumen of the artery. New research into the mechanisms for plaque rupture and atheroembolic stroke indicates that the degree of narrowing is an imperfect predictor of stroke risk, and that other factors, such as plaque composition and remodeling and biomechanical forces acting on the plaque, can play a role...
March 2017: Seminars in Vascular Surgery
https://www.readbyqxmd.com/read/28818257/high-risk-carotid-plaque-lessons-learned-from-histopathology
#7
Frank D Kolodgie, Kazuyuki Yahagi, Hiroyoshi Mori, Maria E Romero, Hugh H Trout, Aloke V Finn, Renu Virmani
The pathophysiology and natural history of atherosclerotic carotid disease is predicated on a more extensive knowledge of lesion progression gained in the studies conducted in the coronary arteries, and these will be reviewed. While the precise sequence of lesion progression leading to carotid plaque vulnerability and cerebrovascular events remain less well understood, specific early and more advanced progressive lesion morphologies associated with stroke risk have been characterized. Of late, there has been a conscious effort for stroke prevention in symptomatic and asymptomatic patients to move beyond luminal stenosis as the only guidance to predict future cerebrovascular events...
March 2017: Seminars in Vascular Surgery
https://www.readbyqxmd.com/read/28816772/a-case-of-lenticulostriate-stroke-due-to-minor-closed-head-injury-in-a-2-year-old-child-role-of-mineralizing-angiopathy
#8
Emin Fidan, Dana D Cummings, Mioara D Manole
OBJECTIVE: Cerebral infarction due to minor head injury is rare. Mineralizing angiopathy is considered a predisposing factor for lenticulostriate stroke after minor closed head injury. This entity is characterized by infarction of the basal ganglia and most often occurs in young children, from infancy to 2 years of age. Symptoms usually occur immediately after the injury. METHODS AND RESULTS: We present the case of a previously healthy 2-year-old female child presenting with right facial hemiparesis and aphasia, along with right arm and leg weakness that occurred immediately after a fall from the couch onto a carpeted floor...
July 3, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28815625/association-of-transcallosal-motor-fibres-with-function-of-both-hands-after-unilateral-neonatal-arterial-ischemic-stroke
#9
Samuel Groeschel, Lucie Hertz-Pannier, Matthieu Delion, Sébastien Loustau, Béatrice Husson, Manoelle Kossorotoff, Cyrille Renaud, Sylvie Nguyen The Tich, Stéphane Chabrier, Mickael Dinomais
AIM: The objective of this study was to investigate the involvement of the motor fibres of the corpus callosum after unilateral neonatal arterial ischemic stroke (NAIS) of the middle cerebral artery territory and the relationship to both ipsilesional and contralesional hand function. METHOD: Using high-resolution structural magnetic resonance imaging (MRI), functional MRI, and magnetic resonance diffusion-tractography, we compared the midsagittal area of the motor part of the corpus callosum (defined by the fibres connecting the precentral gyri) between 33 7-year-old children after unilateral NAIS and 31 typically developing 7-year-old children...
August 17, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28815362/metric-to-quantify-white-matter-damage-on-brain-magnetic-resonance-images
#10
Maria Del C Valdés Hernández, Francesca M Chappell, Susana Muñoz Maniega, David Alexander Dickie, Natalie A Royle, Zoe Morris, Devasuda Anblagan, Eleni Sakka, Paul A Armitage, Mark E Bastin, Ian J Deary, Joanna M Wardlaw
PURPOSE: Quantitative assessment of white matter hyperintensities (WMH) on structural Magnetic Resonance Imaging (MRI) is challenging. It is important to harmonise results from different software tools considering not only the volume but also the signal intensity. Here we propose and evaluate a metric of white matter (WM) damage that addresses this need. METHODS: We obtained WMH and normal-appearing white matter (NAWM) volumes from brain structural MRI from community dwelling older individuals and stroke patients enrolled in three different studies, using two automatic methods followed by manual editing by two to four observers blind to each other...
August 16, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28814097/prominent-deep-medullary-veins-a-predictive-biomarker-for-stroke-risk-from-transient-ischemic-attack
#11
Yang Duan, Zhihua Xu, Hongyi Li, Xiaonan Cai, Cancan Chang, Benqiang Yang
Background Deep medullary veins (DMVs) are a biomarker of severity and prognosis in patients with acute cerebral infarction. However, their clinical significance remains unclear in patients with transient ischemic attack (TIA). Purpose To determine whether prominent deep medullary veins (PDMVs) are a predictive biomarker for stroke risk after TIA. Material and Methods Clinical and imaging data of 49 patients with TIA and 49 sex- and age-matched controls were studied. PDMVs were defined as DMVs with a score of 3 (TDMVs) or asymmetric DMVs (ADMVs), and the relationship between PDMVs and clinical features was analyzed...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28812226/in-light-of-recently-published-clinical-trials-and-their-implication-for-clinical-practice-does-a-large-catchment-area-acute-hospital-require-24%C3%A2-hour-ct-neck-and-head-angiography-and-or-neuro-interventional-services-in-the-setting-of-acute-ischaemic-stroke
#12
REVIEW
J Halpin, C Peters, J O'Brien, T Scanlon, M Shelly, N Cunningham, L Hickey
BACKGROUND: Recently published clinical trials have resulted in a significant change in the guidelines used to manage patients suffering an acute ischaemic stroke. New neuro-interventional techniques have revolutionised stroke outcomes. Currently, such services are only available in two specialist centres. AIMS: We attempted to evaluate the need for the provision of routine computed tomography (CT) angiography and neuro-interventional services at a university teaching hospital in Limerick...
August 15, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28811520/chronic-post-stroke-aphasia-severity-is-determined-by-fragmentation-of-residual-white-matter-networks
#13
Barbara K Marebwa, Julius Fridriksson, Grigori Yourganov, Lynda Feenaughty, Chris Rorden, Leonardo Bonilha
Many stroke survivors with aphasia in the acute period experience spontaneous recovery within the first six months after the stroke. However, approximately 30-40% sustain permanent aphasia and the factors determining incomplete recovery are unclear. Suboptimal recovery may be influenced by disruption of areas seemingly spared by the stroke due to loss of white matter connectivity and network integrity. We reconstructed individual anatomical whole-brain connectomes from 90 left hemisphere stroke survivors using diffusion MR images...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811002/in-debakey-type-i-aortic-dissection-bovine-aortic-arch-is-associated-with-arch-tears-and-stroke
#14
Julia Dumfarth, Sven Peterss, Markus Kofler, Michaela Plaikner, Bulat A Ziganshin, Thomas Schachner, Maryann Tranquilli, Michael Grimm, John A Elefteriades
BACKGROUND: The study sought to evaluate if a bovine aortic arch (BAA) influences the location of the entry site in acute aortic dissection type A (AADA) and to identify the impact of BAA on postoperative outcome, especially stroke. METHODS: A total of 315 patients underwent surgery due to AADA DeBakey type I (72.1% men, mean age 59.5 ± 13.4 years) between 2002 and 2015. Imaging studies and operative reports were screened for presence of BAA and location of the entry site...
August 12, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28810259/reliability-reproducibility-and-prognostic-accuracy-of-the-alberta-stroke-program-early-ct-score-on-ct-perfusion-and-non-contrast-ct-in-hyperacute-stroke
#15
Jillian Naylor, Leonid Churilov, Ziyuan Chen, Miriam Koome, Neil Rane, Bruce C V Campbell
BACKGROUND: Alberta Stroke Program Early CT Score (ASPECTS) assesses early ischemic change on non-contrast CT (NCCT). We hypothesised that assessing ASPECTS regions on CT Perfusion (CTP) rather than NCCT would improve inter-rater agreement and prognostic accuracy, particularly in patients presenting early after stroke onset. METHODS: Ischemic stroke patients treated with intravenous alteplase from 2009 to 2014 at our institution were included in this study. Inter-rater agreement and prognostic accuracy of ASPECTS across modalities were analysed by the time between stroke onset and initial NCCT, dichotomized 1st quartile versus quartiles 2-4, referred to as epochs...
August 16, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/28810239/the-prevalence-of-and-factors-related-to-vascular-hyperintensity-on-t1-weighted-imaging-in-acute-ischemic-stroke
#16
Yuki Sakamoto, Seiji Okubo, Chikako Nito, Satoshi Suda, Noriko Matsumoto, Arata Abe, Junya Aoki, Takashi Shimoyama, Kanako Muraga, Takuya Kanamaru, Kentaro Suzuki, Yuki Go, Masahiro Mishina, Kazumi Kimura
BACKGROUND: Thrombus visualization in patients with acute ischemic stroke has been detected and reported using various imaging modalities. T1-weighted imaging (T1-WI) can depict thrombi as hyperintense signals within vessels. Moreover, in addition to thrombi, T1-WI hyperintensities in arteries may suggest arterial dissection. However, the frequency of and factors related to the T1-hyperintense vessel sign (T1-HVS) are not fully known. The aim of this study was to clarify the prevalence of and related factors for the T1-HVS in patients with acute ischemic stroke...
August 16, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/28810087/multiple-pulmonary-arteriovenous-malformations-an-unusual-cause-of-shortness-of-breath-and-recurrent-strokes
#17
Kalyan C Potu, Shenjing Li, Shawn C Kelly, Julia A Prescott-Focht, Scott Pham
OBJECTIVE: To discuss an uncommon case of a patient with multiple pulmonary arteriovenous malformations (PAVMs) presenting with dyspnea on exertion and recurrent strokes. BACKGROUND: A 79-year-old woman with recent onset recurrent cerebrovascular accidents (CVAs) was referred to cardiology for evaluation of dyspnea on exertion. Clinical examination was unrevealing. METHODS: A transthoracic echocardiogram (TTE) with agitated saline was suggestive of an extra-cardiac shunt...
February 2017: South Dakota Medicine: the Journal of the South Dakota State Medical Association
https://www.readbyqxmd.com/read/28807158/effect-of-chinese-herbal-medicine-on-molecular-imaging-of-neurological-disorders
#18
Yao Yao, Ting Chen, Jing Huang, Hong Zhang, Mei Tian
Chinese herbal medicine has been used to treat a wide variety of neurological disorders including stroke, Alzheimer's disease, and Parkinson's disease. However, its mechanism behind the effectiveness remains unclear. Recently, molecular imaging technology has been applied for this purpose, since it can assess the cellular or molecular function in a living subject by using specific imaging probes and/or radioactive tracers, which enable efficient analysis and monitoring the therapeutic response repetitively...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28803639/atrial-fibrillation-and-stroke-as-initial-manifestations-of-painless-type-a-aortic-dissection
#19
Claudia Stöllberger, Lilian Schäffl-Doweik, Maria Korn, Josef Finsterer
Aortic dissection is diagnostically challenging, especially in pain-free patients. Detection of acute ischemic stroke secondary to painless aortic dissection is a challenge for emergency physicians and neurologists. We report a previously healthy 58-years old female, admitted because of nausea, dizziness, somnolence, a left-sided hemiparesis and arterial hypotension. The electrocardiogram showed atrial fibrillation with ST-elevations and ST-depressions. Perfusion CT-imaging showed a dilatation of the aortic arch and intraluminal structures indicating an intima flap of aortic dissection...
July 21, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28803427/unknown-onset-ischemic-strokes-in-patients-last-seen-well-4-5%C3%A2-h-differences-between-wake-up-and-daytime-unwitnessed-strokes
#20
Luuk Dekker, Hajo Hund, Robin Lemmens, Jelis Boiten, Ido van den Wijngaard
Patients with unknown time of stroke onset (UOS) represent around one-third of ischemic stroke patients. These are patients with wake-up stroke (WUS) or daytime-unwitnessed stroke (DUS), often presenting outside the time-window for reperfusion therapy. UOS patients presenting between 4.5 and 12 h after time of last-seen-well were included. Clinical and imaging characteristics were compared between WUS and DUS patients. Good functional outcome was defined as a modified Rankin scale of ≤2 at follow-up. Sixty-one UOS patients were included: 42 WUS and 19 DUS patients...
August 12, 2017: Acta Neurologica Belgica
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