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MRA Cerebral

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https://www.readbyqxmd.com/read/29281095/proximal-and-distal-occlusion-of-complex-cerebral-aneurysms-implications-of-flow-modeling-by-fluid-structure-interaction-analysis
#1
Jasper H G Helthuis, Sindhoor Bhat, Tristan P C van Doormaal, Ramarathnam Krishna Kumar, Albert van der Zwan
BACKGROUND: In complex cerebral aneurysms, adequate treatment by complete occlusion is not always possible. Partial occlusion by either proximal or distal occlusion is an alternative. However, the hemodynamic consequences of these partial occlusion options are often not easily predictable. OBJECTIVE: To assess the feasibility of fluid-structure interaction (FSI) analysis to investigate the hemodynamic changes after partial occlusion in cerebral aneurysms. METHODS: Two patients were analyzed...
December 21, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29260652/case-report-reversible-cerebral-vasoconstriction-syndrome-in-severe-cerebral-malaria
#2
Kei Yamamoto, Yasuyuki Kato, Koh Shinohara, Satoshi Kutsuna, Nozomi Takeshita, Kayoko Hayakawa, Moritoshi Iwagami, Shigeyuki Kano, Shu Watanabe, Norio Ohmagari
Cerebral malaria is a severe complication of falciparum malaria that occurs infrequently in adults. Here, we describe the case of a 21-year-old man who presented with fever and headache 13 days after returning from a 12-day trip to Kenya and was subsequently diagnosed with falciparum malaria. Complications of cerebral malaria developed within 1 day after the initiation of therapy with intravenous quinine, and the patient entered a deep coma. Magnetic resonance angiography (MRA) revealed multiple vasoconstrictions in his brain...
December 18, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29259024/inclusion-criteria-update-for-the-rat-intraluminal-ischaemic-model-for-preclinical-studies
#3
Héctor Fernández-Susavila, Ramón Iglesias-Rey, Antonio Dopico-López, María Pérez-Mato, Tomás Sobrino, José Castillo, Francisco Campos
Proper occlusion of the medial cerebral artery, as determined by laser Doppler monitoring, during cerebral ischaemia in rat models is an important inclusion criterion in experimental studies. However, successful occlusion of the artery does not always guarantee a reproducible infarct volume, which is crucial for validating the efficacy of new protective drugs. In a rat intraluminal ischaemic model, laser Doppler monitoring alone was compared with laser Doppler monitoring in combination with magnetic resonance angiography (MRA) and diffusion-weighted imaging (DWI)...
December 19, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29215168/decreased-signal-intensity-ratio-on-mra-reflects-misery-perfusion-on-spect-in-patients-with-intracranial-stenosis
#4
Masatomo Miura, Makoto Nakajima, Akiko Fujimoto, Shinya Shiraishi, David S Liebeskind, Yukio Ando
BACKGROUND AND PURPOSE: Acetazolamide reactivity on 123 I-IMP SPECT is used to detect misery perfusion due to intracranial atherosclerosis. Noninvasive fractional flow assessed by signal intensity ratio (SIR) on time of flight-magnetic resonance angiography (TOF-MRA) might offer a feasible alternative to identify high-risk intracranial stenosis. METHODS: Data from consecutive patients with unilateral middle cerebral artery (MCA) stenosis who underwent both TOF-MRA and acetazolamide reactivity on 123 I-IMP SPECT were retrospectively analyzed...
December 7, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29214780/mismatch-between-tof-mr-angiography-and-ct-angiography-of-the-middle-cerebral-artery-may-be-a-critical-sign-in-cerebrovascular-dynamics
#5
Keiji Igase, Michiya Igase, Ichiro Matsubara, Kazuhiko Sadamoto
PURPOSE: Although time-of-flight (TOF)-magnetic resonance angiography (MRA) can clearly depict intracranial arteries, the arterial flow of middle cerebral artery (MCA) is occasionally not detected. We evaluated this phenomenon with reference to cerebrovascular dynamics. MATERIALS AND METHODS: Seventeen patients with suspected occlusion of MCA or internal carotid artery on TOF-MRA were enrolled. All patients underwent CT angiography (CTA) and quantitative cerebral blood flow (CBF) examination for measurement of resting CBF and cerebrovascular reactivity (CVR)...
January 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29170838/embolization-of-a-traumatic-arteriovenous-fistula-between-the-middle-meningeal-artery-and-middle-meningeal-vein-in-a-child-with-pulsatile-tinnitus
#6
Mesha Martinez, Paola Pergami, Jonathan Murnick, Monica S Pearl
Traumatic arteriovenous fistulas (AVFs) involving the middle meningeal artery (MMA) are uncommon lesions and rare in the pediatric population. An adolescent with headaches developed a bruit and a rhythmic "swooshing" noise in the left ear 9 weeks after a traumatic brain injury involving a left temporal bone fracture. An MRA of the brain demonstrated an enlarged left MMA and arterialized flow in the left middle meningeal vein (MMV), suggestive of an AVF. Cerebral angiography confirmed and characterized the left MMA-MMV fistula, which drained into the pterygoid plexus...
November 23, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29166955/brain-arterial-diameters-and-cognitive-performance-the-northern-manhattan-study
#7
Jose Gutierrez, Erin Kulick, Yeseon Park Moon, Chuanhui Dong, Ken Cheung, Bagci Ahmet, Yaakov Stern, Noam Alperin, Tatjana Rundek, Ralph L Sacco, Clinton B Wright, Mitchell S V Elkind
OBJECTIVES: To test the hypothesis that brain arterial diameters are associated with cognitive performance, particularly in arteries supplying domain-specific territories. METHODS: Stroke-free participants in the Northern Manhattan Study were invited to have a brain MRI from 2003-2008. The luminal diameters of 13 intracranial arterial segments were obtained using time-of-flight magnetic resonance angiogram (MRA), and then averaged and normalized into a global score and region-specific arterial diameters...
November 23, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/29154893/an-interleaved-sequence-for-simultaneous-magnetic-resonance-angiography-mra-susceptibility-weighted-imaging-swi-and-quantitative-susceptibility-mapping-qsm
#8
Yongsheng Chen, Saifeng Liu, Sagar Buch, Jiani Hu, Yan Kang, E Mark Haacke
PURPOSE: To image the entire vasculature of the brain with complete suppression of signal from background tissue using a single 3D excitation interleaved rephased/dephased multi-echo gradient echo sequence. This ensures no loss of signal from fast flow and provides co-registered susceptibility weighted images (SWI) and quantitative susceptibility maps (QSM) from the same scan. MATERIALS AND METHODS: The suppression of background tissue was accomplished by subtracting the flow-dephased images from the flow-rephased images with the same echo time of 12...
November 14, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29126049/large-scale-subject-specific-cerebral-arterial-tree-modeling-using-automated-parametric-mesh-generation-for-blood-flow-simulation
#9
Mahsa Ghaffari, Kevin Tangen, Ali Alaraj, Xinjian Du, Fady T Charbel, Andreas A Linninger
In this paper, we present a novel technique for automatic parametric mesh generation of subject-specific cerebral arterial trees. This technique generates high-quality and anatomically accurate computational meshes for fast blood flow simulations extending the scope of 3D vascular modeling to a large portion of cerebral arterial trees. For this purpose, a parametric meshing procedure was developed to automatically decompose the vascular skeleton, extract geometric features and generate hexahedral meshes using a body-fitted coordinate system that optimally follows the vascular network topology...
December 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29123909/basi-parallel-anatomical-scanning-magnetic-resonance-imaging-for-the-diagnosis-of-reversible-cerebral-vasoconstriction-syndrome-of-the-basilar-artery-a-case-report
#10
Akitaka Yamamoto, Yukinari Omori, Akihiro Shindo, Hiroshi Imai, Hidenori Suzuki
Case: Reversible cerebral vasoconstriction syndrome (RCVS) is an increasingly recognized and important cause of thunderclap headache. Delays in diagnosis may cause deterioration of symptoms and concomitant unnecessary investigations. However, the diagnosis of RCVS in the acute stage remains difficult.A 41-year-old man was admitted to the emergency department for severe, recurrent occipital headaches. The results of initial computed tomography and magnetic resonance imaging (MRI) of the brain and cerebrospinal fluid analysis were normal...
October 2017: Acute Medicine & Surgery
https://www.readbyqxmd.com/read/29116545/intravenous-thrombolysis-in-sle-related-stroke-a-case-report-and-literature-review
#11
Xiaodong Chen, Gelin Xu
Patients with systemic lupus erythematosus (SLE) bear an increased risk of ischemic stroke. However, evidences for treating acute stroke due to artery thrombosis in SLE patients are extremely limited. A 45-year-old woman experienced sudden left hemiplegia. She was transported to the emergency department of our hospital 2 hours after the initial symptom. According to the medical records, the patient was diagnosed with SLE at the age of 28. CT scanned 150 min after the initial symptom showed no evidence of acute changes or hemorrhage...
November 7, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/29113412/collateral-vessels-on-magnetic-resonance-angiography-in-endovascular-treated-acute-ischemic-stroke-patients-associated-with-clinical-outcomes
#12
Liang Jiang, Hao-Bo Su, Ying-Dong Zhang, Jun-Shan Zhou, Wen Geng, Huiyou Chen, Quan Xu, Xindao Yin, Yu-Chen Chen
Purpose: Collateral vessels were considered to be related with outcome in endovascular-treated acute ischemic stroke patients. This study aimed to evaluate whether the collateral vessels on magnetic resonance angiography (MRA) could predict the clinical outcome. Materials and Methods: Acute stroke patients with internal carotid artery or middle cerebral artery occlusion within 6 hours of symptom onset were included. All patients underwent MRI and received endovascular treatment...
October 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/29112472/clinical-evaluation-of-silent-t1-weighted-mri-and-silent-mr-angiography-of-the-brain
#13
Samantha J Holdsworth, Sarah J Macpherson, Kristen W Yeom, Max Wintermark, Greg Zaharchuk
OBJECTIVE: New MRI sequences based on rapid radial acquisition have reduced gradient noise. The purpose of this study was to compare Silent T1-weighted and unenhanced MR angiography (MRA) against conventional sequences in a clinical population. MATERIALS AND METHODS: The study cohort consisted of 40 patients with suspected brain metastases (median age, 60 years; range, 23-91 years) who underwent T1-weighted contrast-enhanced MRI and 51 patients with suspected vascular lesions or cerebral ischemia (median age, 60 years; range, 16-94 years) who underwent unenhanced intracranial MRA...
November 7, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29046469/-a-rare-case-of-ruptured-unruptured-miniature-aneurysms-originating-from-the-infundibular-dilatation-of-the-callosomarginal-artery-branching-from-the-infracallosal-a2-segment-of-the-azygos-anterior-cerebral-artery
#14
Shota Yoshimura, Chika Somagawa, Kei Satoh, Yutaka Fukuda, Takeshi Hiu, Tomonori Ono, Ryujiro Ushijima, Keisuke Toda, Keisuke Tsutsumi
We report the first case of two de novo miniature aneurysms(ruptured/unruptured)emerging from the infundibular dilatation(ID)of the callosomarginal artery, which branches from the infracallosal(A2)segment of the azygos anterior cerebral artery(AACA), in a 36-year-old woman. The patient had previously been diagnosed with a miniature, unruptured aneurysm, occurring in the A2 segment of the AACA, detected by CT angiography(CTA)at another hospital two years ago, and had been followed up with MR angiography(MRA)every 6 months...
October 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/29046137/magnetic-resonance-imaging-mri-and-digital-subtraction-angiography-investigation-of-childhood-moyamoya-disease
#15
Peiji Song, Jing Qin, Han Lun, Penggang Qiao, Anming Xie, Gongjie Li
Because digital subtraction angiography (DSA) is not an ideal angiographic examination for moyamoya disease in the pediatric population, magnetic resonance angiography (MRA) provides a noninvasive contrast-free angiographic examination; whereas magnetic resonance imaging (MRI) provides superior spatial resolution and soft-tissue contrast for lesion assessment. Ninety patients with moyamoya disease were examined by MRI and DSA to assess the distribution of lesions and their diagnostic agreement between modalities...
November 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/29044753/development-of-a-quantitative-intracranial-vascular-features-extraction-tool-on-3d-mra-using-semiautomated-open-curve-active-contour-vessel-tracing
#16
Li Chen, Mahmud Mossa-Basha, Niranjan Balu, Gador Canton, Jie Sun, Kristi Pimentel, Thomas S Hatsukami, Jenq-Neng Hwang, Chun Yuan
PURPOSE: To develop a quantitative intracranial artery measurement technique to extract comprehensive artery features from time-of-flight MR angiography (MRA). METHODS: By semiautomatically tracing arteries based on an open-curve active contour model in a graphical user interface, 12 basic morphometric features and 16 basic intensity features for each artery were identified. Arteries were then classified as one of 24 types using prediction from a probability model...
October 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29040971/characteristics-and-outcomes-of-vertebrobasilar-artery-dissection-with-accompanied-atherosclerosis
#17
Chun Chien, Feng-Chi Chang, Hui-Chi Huang, Jui-Yao Tsai, Chih-Ping Chung
BACKGROUND: With the popularity of MRI use, vertebrobasilar artery dissection (VBD) has been found more frequently in patients with posterior circulation ischemic stroke (PCS). The relationship between VBD and atherosclerosis is unknown. The present study aimed to prove the hypothesis that PCS with pure VBD (p-VBD) and with VBD and accompanied cervical or cerebral artery atherosclerosis (a-VBD) have distinct manifestations. METHODS: Patients with VBD-related PCS who were prospectively enrolled in the Taipei Veterans General Hospital Stroke Registry between January 1, 2010 and August 31, 2014 were recruited for the present study...
October 17, 2017: Cerebrovascular Diseases Extra
https://www.readbyqxmd.com/read/28970078/evaluation-of-cerebral-arterial-and-venous-system-in-tuberculous-meningitis
#18
Jayantee Kalita, Rajesh K Singh, Usha K Misra, Sunil Kumar
BACKGROUND: Central nervous system infection especially pyogenic results in cerebral venous sinus thrombosis. Tuberculous meningitis (TBM) although associated with infarctions but there is no comprehensive study evaluating the role of CVST contributing in infarction. PURPOSE: To evaluate cerebral arterial and venous system using MR angiography (MRA) and MR venography (MRV) in TBM, and correlate with clinical and MRI findings. MATERIALS AND METHODS: Consecutive patients with TBM were evaluated clinically and their consciousness was assessed by using Glasgow Coma scale...
September 29, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28953897/evaluation-of-cerebral-blood-flow-change-after-cigarette-smoking-using-quantitative-mra
#19
Yunsun Song, Joong-Goo Kim, Hong-Jun Cho, Jae Kyun Kim, Dae Chul Suh
BACKGROUND AND OBJECTIVE: Changes in cerebral blood flow (CBF) immediately after cigarette smoking (CS) are still unclear. Our purpose was to evaluate the hemodynamic changes in each intracranial vessel after CS by using quantitative magnetic resonance angiography (MRA). MATERIAL AND METHODS: Fifteen healthy male smokers less than 45 years old with more than 3 pack-year smoking history were enrolled in this study. The hemodynamic change in the vessels, represented by cerebral flow rate (CFR, ml/s) and flow velocity (FV, cm/s), was quantitatively measured in eleven vascular segments of the brain using phase-contrast MRA...
2017: PloS One
https://www.readbyqxmd.com/read/28948399/interventional-magnetic-resonance-imaging-guided-carotid-embolectomy-using-a-novel-resonant-marker-catheter-demonstration-of-preclinical-feasibility
#20
Jeffrey K Yang, Andre M Cote, Caroline D Jordan, Sravani Kondapavulur, Aaron D Losey, David McCoy, Andrew Chu, Jay F Yu, Teri Moore, Carol Stillson, Fabio Settecase, Matthew D Alexander, Andrew Nicholson, Daniel L Cooke, Maythem Saeed, Dave Barry, Alastair J Martin, Mark W Wilson, Steven W Hetts
To assess the visualization and efficacy of a wireless resonant circuit (wRC) catheter system for carotid artery occlusion and embolectomy under real-time MRI guidance in vivo, and to compare MR imaging modality with x-ray for analysis of qualitative physiological measures of blood flow at baseline and after embolectomy. The wRC catheter system was constructed using a MR compatible PEEK fiber braided catheter (Penumbra, Inc, Alameda, CA) with a single insulated longitudinal copper loop soldered to a printed circuit board embedded within the catheter wall...
September 25, 2017: Biomedical Microdevices
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