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MRA Cerebral

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https://www.readbyqxmd.com/read/28936607/time-of-flight-mr-angiography-in-cerebral-venous-sinus-thrombosis
#1
Dimitri Renard, Emmanuelle Le Bars, Caroline Arquizan, Nicolas Gaillard, Nicolas Menjot de Champfleur, Isabelle Mourand
Recently, time-of-flight (TOF) and gadolinium-enhanced MR angiography (MRA) imaging have been used to demonstrate subacute intramural hematoma in cervical artery dissection and to detect intraplaque haemorrhage. Our aim was to perform an exploratory study to analyse if venous thrombus-related signal changes (potentially showing iso- or hyperintensity) in cerebral venous sinus thrombosis (CVST) could be observed on 3D-TOF MRA imaging. We analysed retrospectively MRIs of CVST patients in whom both contrast-enhanced MR venography (CEMRV) and 3D-TOF sequences were performed in the acute/subacute phase (i...
September 21, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/28913838/simultaneous-acquisition-of-perfusion-image-and-dynamic-mr-angiography-using-time-encoded-pseudo-continuous-asl
#2
Yuriko Suzuki, Michael Helle, Peter Koken, Marc Van Cauteren, Matthias J P van Osch
PURPOSE: Both dynamic magnetic resonance angiography (4D-MRA) and perfusion imaging can be acquired by using arterial spin labeling (ASL). While 4D-MRA highlights large vessel pathology, such as stenosis or collateral blood flow patterns, perfusion imaging provides information on the microvascular status. Therefore, a complete picture of the cerebral hemodynamic condition could be obtained by combining the two techniques. Here, we propose a novel technique for simultaneous acquisition of 4D-MRA and perfusion imaging using time-encoded pseudo-continuous arterial spin labeling...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28913611/prospective-intraindividual-comparison-of-gadoterate-and-gadobutrol-for-cervical-and-intracranial-contrast-enhanced-magnetic-resonance-angiography
#3
Philip Hoelter, Stefan Lang, Marina Weibart, Manuel Schmidt, Michael F X Knott, Tobias Engelhorn, Marco Essig, Stephan Kloska, Arnd Doerfler
PURPOSE: Gadobutrol (GB) is reported to provide improved relaxivity and concentration compared to gadoterate (GT). This study was designed to intraindividually compare quantitative and qualitative enhancement characteristics of GB to GT in cervicocranial magnetic resonance angiography (MRA) of patients with cerebrovascular disease (CVD). METHODS: Patients (n = 54) with CVD underwent two identical contrast-enhanced magnetic resonance angiography (CE-MRA) examinations of the cervical and intracranial vasculature in randomized order, using GB and GT in equimolar dose...
September 14, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28890009/impact-of-onyx%C3%A2-embolization-on-radiosurgical-management-of-cerebral-avm-treatment-and-outcome
#4
Ido Strauss, Oz Haim, Daniel Umansky, Benjamin W Corn, Vladimir Frolov, Natan Shtraus, Shimon Maimon, Andrew A Kanner
BACKGROUND: Stereotactic radiosurgery (SRS) is a well-established treatment modality for cerebral arterio-venous malformations (AVMs). The main limiting factor in the radiosurgical treatment of AVMs is the volume of the nidus with high-grade lesions often requiring combined treatment to reduce the SRS target volume. To overcome this limitation, we have been using a combined treatment approach consisting of endovascular embolization with ONYX followed by SRS. OBJECTIVE: To evaluate our clinical experience for safety and feasibility of this multimodality treatment approach...
September 7, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28882716/remote-thoracic-myelopathy-from-a-spinal-dural-arteriovenous-fistula-at-the-cranio-cervical-junction-case-report-and-review-of-literature
#5
Michael J Lang, Stavropoula Tjoumakaris, Robert H Rosenwasser, Pascal Jabbour
BACKGROUND: The cranio-cervical junction is a rare location for spinal dural arteriovenous fistulas (dAVF). Typically, fistulas at this location present with findings related to intracranial cortical venous reflux or with cervical myelopathy. We present a case of cranio-cervical junction dAVF with isolated clinical and radiographic findings of thoracolumbar myelopathy. CASE DESCRIPTION: A 54 year-old male presented with subacute onset of lower extremity weakness, paresthesias and gait dysfunction...
September 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28882090/stenosis-length-of-middle-cerebral-artery-and-branch-atheromatous-disease-associated-infarct
#6
Jian Wang, Yujie Wang, Zijia Chai, Yue Xin, Jialiang Wang, Jianting Qiu
ABSRACT Background: We analyzed the relationship between the characteristics of branch atheromatous disease associated infarct (BAI) and stenosis length (SL) of relevant middle cerebral artery (MCA) M1 segment. METHODS: 95 patients with BAI were recruited from 1024 consecutive acute ischemic stroke patients. Among them, 59 patients (62.11%) had concurrent relative stenosis of MCA M1 segment. The neurologic deficit severity at admission was assessed by NIHSS and the infarct size by infarct lesion thickness and maximum diameter...
September 8, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28870823/occipital-artery-to-middle-cerebral-artery-bypass-operative-nuances
#7
Toshikazu Kimura, Akio Morita
BACKGROUND: Superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis is a common procedure for vascular neurosurgeons, and it is used in a variety of diseases. However, there are cases in which the STA is absent or is too hypoplastic to be used as a donor for revascularization. Occipital artery-MCA (OA-MCA) bypass may be a treatment option in these cases. METHODS: We encountered four cases of symptomatic cerebral ischemia in which the STA was absent or unavailable...
September 1, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28856460/late-onset-pompe-disease-a-genetic-radiological-correlation-on-cerebral-vascular-anomalies
#8
A Pichiecchio, S Sacco, P De Filippi, E Caverzasi, S Ravaglia, S Bastianello, C Danesino
Pompe disease is an autosomal recessive disorder in which deficiency of the lysosomal enzyme acid alpha-glucosidase results in the accumulation of glycogen mostly in muscle tissues. Several reports suggest a higher incidence of intracranial vascular abnormalities (IVAs) in this condition, as well as brain microbleeds and cerebral vasculopathy. The aim of our study was to evaluate through neuroimaging studies the incidence of these anomalies in our cohort of late-onset Pompe disease (LOPD) patients asymptomatic for cerebrovascular disease, looking for correlations with clinical and genetic data...
August 30, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28843802/a-recurrent-case-of-ischemic-stroke-caused-by-vasospasm-due-to-giant-cell-arteritis
#9
Reina Kawamura, Atsushi Mizuma, Maiko Kouchi, Eiichiro Nagata, Wakoh Takahashi, Shunya Takizawa
A 73-year-old man was admitted with sudden right upper-limb weakness. He had a temporal headache on the left side and had a 4-month history of fever. Meandering of the left temporal artery (TA) with induration and high inflammatory responses (white blood cell count 22,500 per microliter, C-reactive protein 35.0 mg/dL, and elevated sedimentation rate [ESR] 80 mm/h) were observed. Glycometabolism and lipid metabolism were normal, and autoimmune antibodies were negative. Cultivation tests revealed no bacteria in either blood culture or cerebrospinal fluid...
August 23, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28843762/preventing-cerebral-vasospasm-after-aneurysmal-subarachnoid-hemorrhage-with-aggressive-cisternal-clot-removal-and-nicardipine
#10
Nakao Ota, Hidetoshi Matsukawa, Hiroyasu Kamiyama, Toshiyuki Tsuboi, Kosumo Noda, Atsumu Hashimoto, Takanori Miyazaki, Yu Kinoshita, Norihiro Saito, Sadahisa Tokuda, Kyousuke Kamada, Rokuya Tanikawa
BACKGROUND: and Importance: A subarachnoid clot is the strongest predictor of cerebral vasospasm. Our purpose was to analyze the relationship between the number of postoperative cisternal clots and cerebral vasospasm and to assess the efficacy of surgical clot removal. METHODS: The subjects were 158 aneurysmal subarachnoid hemorrhage (SAH) patients. All underwent clipping with cisternal clot removal. The pre- and postoperative number of clots was semiquantitatively analyzed using CT, and cerebral vasospasm and its severity were analyzed using magnetic resonance angiography (MRA) in a blind fashion...
August 23, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28836310/deep-neural-network-based-computer-assisted-detection-of-cerebral-aneurysms-in-mr-angiography
#11
Takahiro Nakao, Shouhei Hanaoka, Yukihiro Nomura, Issei Sato, Mitsutaka Nemoto, Soichiro Miki, Eriko Maeda, Takeharu Yoshikawa, Naoto Hayashi, Osamu Abe
BACKGROUND: The usefulness of computer-assisted detection (CAD) for detecting cerebral aneurysms has been reported; therefore, the improved performance of CAD will help to detect cerebral aneurysms. PURPOSE: To develop a CAD system for intracranial aneurysms on unenhanced magnetic resonance angiography (MRA) images based on a deep convolutional neural network (CNN) and a maximum intensity projection (MIP) algorithm, and to demonstrate the usefulness of the system by training and evaluating it using a large dataset...
August 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28826708/occlusion-status-on-magnetic-resonance-angiography-is-associated-with-risk-of-delayed-ischemic-events-in-cerebral-aneurysms-treated-with-stent-assisted-coiling
#12
Takayuki Kikuchi, Akira Ishii, Hideo Chihara, Daisuke Arai, Mitsushige Ando, Yohei Takenobu, Tomohisa Okada, Yasushi Takagi, Susumu Miyamoto
OBJECTIVE: Management after stent-assisted coiling (SAC) for unruptured intracranial aneurysm is sometimes difficult because close monitoring for ischemic events for a long period of time after the procedure is necessary. The purpose of this study was to clarify the usefulness of magnetic resonance angiography (MRA) at follow-up after SAC. METHODS: Sixty-six consecutive cases of SAC for unruptured intracranial aneurysm in our institute and affiliated hospitals were retrospectively reviewed for a delayed ischemic event...
August 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28826580/comparison-of-rates-of-growth-between-unruptured-and-ruptured-aneurysms-using-magnetic-resonance-angiography
#13
Zenichiro Watanabe, Noriaki Tomura, Isao Akasu, Ryoji Munakata, Kazuomi Horiuchi, Kazuo Watanabe
BACKGROUND AND PURPOSE: Growth is a key risk factor for rupture of unruptured cerebral aneurysms. There are few reports of investigations into the actual growth of ruptured intracranial aneurysms. The aim of the present study was to ascertain the risk of rupture of aneurysms based on the growth of unruptured and ruptured aneurysms. METHODS: Changes in size on magnetic resonance angiography (MRA) were examined in 50 patients with ruptured cerebral aneurysms. Images obtained before and after subarachnoid hemorrhage were used...
August 17, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28814594/concomitant-carotid-aplasia-and-basilar-artery-occlusion-in-a-child-with-phaces-syndrome
#14
Noel Delgado, Jason J Carroll, Philip M Meyers
We report a case of an 8-year-old girl with posterior fossa abnormalities, haemangioma, arterial lesions, cardiac abnormalities or coarctation of the aorta and eye abnormalities syndrome with right carotid aplasia and complete basilar occlusion. The patient initially presented at 2.5 weeks of age with a growing right facial haemangioma involving segments 1, 3 and 4. Initial MRI at 2.5 weeks of age revealed an extraconal right orbital haemangioma without posterior fossa abnormalities and MR angiography (MRA) 3 weeks later showed right internal carotid aplasia...
August 16, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28796397/clinical-evaluation-of-time-of-flight-mr-angiography-with-sparse-undersampling-and-iterative-reconstruction-for-cerebral-aneurysms
#15
Yasutaka Fushimi, Tomohisa Okada, Takayuki Kikuchi, Akira Yamamoto, Tsutomu Okada, Takayuki Yamamoto, Michaela Schmidt, Kazumichi Yoshida, Susumu Miyamoto, Kaori Togashi
Compressed sensing (CS) MRI has just been introduced to research areas as an innovative approach to accelerate MRI. CS is expected to achieve higher k-space undersampling by exploiting the underlying sparsity in an appropriate transform domain. MR angiography (MRA) provides high spatial resolution information on arteries; however, a relatively long acquisition time is necessary to cover a wide volume. Reduction of acquisition time by CS for time-of-flight (TOF) MR angiography (Sparse-TOF) is beneficial in clinical examinations; therefore, the clinical validity of Sparse-TOF needs to be investigated...
August 10, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28782410/non-invasive-methods-for-measuring-vascular-changes-in-neurovascular-headaches
#16
Henrik W Schytz, Faisal M Amin, Juliette Selb, David A Boas
Vascular changes during spontaneous headache attacks have been studied over the last 30 years. The interest in cerebral vessels in headache research was initially due to the hypothesis of cerebral vessels as the pain source. Here, we review the knowledge gained by measuring the cerebral vasculature during spontaneous primary headache attacks with the use of single photon emission tomography (SPECT), positron emission tomography (PET), magnetic resonance imaging (MRA) and transcranial Doppler (TCD). Furthermore, the use of near-infrared spectroscopy in headache research is reviewed...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28780405/malignant-cerebral-swelling-after-cranioplasty-due-to-ipsilateral-intracranial-vasculopathy-case-report-and-literature-review
#17
Bo Chen, Wenchen Li, Lixiang Zhou, Shuanglin Fu, Haifeng Wang, Shuyan Zhang
BACKGROUND: Cranioplasty is a well-established surgical operation that is used worldwide for skull defect patients following decompressive craniectomy (DC). However, especially in some cases, fatal complications such as malignant cerebral swelling after uneventful cranioplasty should be attended to. CASE DESCRIPTION: We present a rare case of massive malignant ipsilateral cerebral swelling following uneventful titanium mesh cranioplasty due to rare ipsilateral intracranial vasculopathy confirmed by magnetic resonance angiography and magnetic resonance venography (MRA and MRV)...
August 2, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28776469/relationship-between-haemodynamic-impairment-and-collateral-blood-flow-in-carotid-artery-disease
#18
Nolan S Hartkamp, Esben T Petersen, Michael A Chappell, Thomas W Okell, Maarten Uyttenboogaart, Clark J Zeebregts, Reinoud Ph Bokkers
Collateral blood flow plays a pivotal role in steno-occlusive internal carotid artery (ICA) disease to prevent irreversible ischaemic damage. Our aim was to investigate the effect of carotid artery disease upon cerebral perfusion and cerebrovascular reactivity and whether haemodynamic impairment is influenced at brain tissue level by the existence of primary and/or secondary collateral. Eighty-eight patients with steno-occlusive ICA disease and 29 healthy controls underwent MR examination. The presence of collaterals was determined with time-of-flight, two-dimensional phase contrast MRA and territorial arterial spin labeling (ASL) imaging...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28774679/ultra-high-field-tof-mra-a-method-to-visualize-small-cerebral-vessels-7t-tof-mra-sequence-parameters-on-different-mri-scanners-literature-review
#19
REVIEW
Cezary Grochowski, Grzegorz Staśkiewicz
INTRODUCTION: Time-of-flight (TOF) angiography is a technique allowing to visualize the blood flow in vessels. 7T ToF-MRA is able to visualize the whole Circle of Willis including small perforating branches without any known side effects as opposed to usually used DSA and CTA with high exposition to the radiation and high doses of contrast as far as CTA is concerned. AIM: The aim of this review is to describe ultra-high field ToF-MRA and present different protocol data depending on the scanner used in the study...
July 8, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28754270/fast-acceleration-of-asl-based-time-resolved-magnetic-resonance-angiography-by-acquisition-of-control-and-labeled-images-in-the-same-shot-fast-actress-an-optimization-study
#20
Hiroyuki Sugimori, Noriyuki Fujima, Yuriko Suzuki, Hiroyuki Hamaguchi, Kinya Ishizaka, Kohsuke Kudo
PURPOSE: To establish an optimized sequence design for fast acceleration of arterial spin labeling (ASL)-based time-resolved magnetic resonance angiography (MRA) by acquisition of control and labeled images in the same shot (fast ACTRESS) and a scan time of <1min, for the evaluation of intracranial vessels. MATERIALS AND METHODS: Ten healthy volunteers with no unilateral symptomatic arterial stenosis, who underwent 3-tesla MRI, were investigated. Imaging parameters for the fast ACTRESS sequence were set with an acquisition time of 45s...
July 25, 2017: Magnetic Resonance Imaging
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