keyword
MENU ▼
Read by QxMD icon Read
search

CBV

keyword
https://www.readbyqxmd.com/read/28328241/perfusion-ct-in-acute-stroke-effectiveness-of-automatically-generated-colour-maps
#1
Maja Ukmar, Ferruccio Degrassi, Roberta Antea Pozzi Mucelli, Francesca Neri, Fabio Pozzi Mucelli, Maria Assunta Cova
OBJECTIVE: To evaluate the accuracy of perfusion CT (pCT) in the definition of the infarcted core and the penumbra, comparing the data obtained from the evaluation of parametric maps [cerebral blood volume (CBV), cerebral blood flow (CBF) and mean transit time (MTT)] with software-generated colour maps. METHODS: A retrospective analysis was performed to identify patients with suspected acute ischaemic strokes and who had undergone unenhanced CT and pCT carried out within 4...
April 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28306132/evaluation-of-functional-outcome-measured-by-modified-rankin-scale-in-rtpa-treated-patients-with-acute-ischemic-stroke
#2
B Georgievski-Brkic, M Savic, D Nikolic, L Nikcevic, M Vukicevic, D Kozic
Aim of our study was to assess functional outcome measured by modified Rankin scale (mRS) in patients that were treated with thrombolytic therapy-recombinant tissue plasminogen activator (rtPA) after acute ischemic stroke. The study included 100 participants that were treated after acute ischemic stroke. Analyzed parameters included: gender; age groups: age 54 and below (Groupup to-54), 55-64 (Group55-64), 65-74 (Group65-74), and 75 and above (Group75-up); cerebral blood flow (CBF) and cerebral blood volume (CBV)...
December 1, 2016: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/28282456/early-computed-tomography-based-scores-to-predict-decompressive-hemicraniectomy-after-endovascular-therapy-in-acute-ischemic-stroke
#3
Ilko L Maier, Daniel Behme, Marlena Schnieder, Ioannis Tsogkas, Katharina Schregel, Mathias Bähr, Michael Knauth, Jan Liman, Marios-Nikos Psychogios
BACKGROUND: Identification of patients requiring decompressive hemicraniectomy (DH) after endovascular therapy (EVT) is crucial as clinical signs are not reliable and early DH has been shown to improve clinical outcome. The aim of our study was to identify imaging-based scores to predict the risk for space occupying ischemic stroke and DH. METHODS: Prospectively derived data from patients with acute large artery occlusion within the anterior circulation and EVT was analyzed in this monocentric study...
2017: PloS One
https://www.readbyqxmd.com/read/28269164/an-integrated-neuroprotective-intervention-for-brain-ischemia-validated-by-ecog-fpam
#4
Yu-Hang Liu, Lun-De Liao, Su Jing Chan, Aishwarya Bandla, Nitish V Thakor
Brain ischemia is a neurological deficit caused by a reduction in the blood supply to tissue, and one of the leading causes of disability in the world. Currently, the most well-known therapeutic agent for ischemia recovery is recombinant tissue plasminogen activator (rtPA), but it is viable for only a small portion (approximately 3.6%) of ischemic patients and may cause side effects such as tissue damage. Thus, introducing a new therapeutic concept for ischemia, we proposed an integrated intervention combining global and focal stimulations in this article...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28254456/linking-brain-vascular-physiology-to-hemodynamic-response-in-ultra-high-field-mri
#5
Kâmil Uludağ, Pablo Blinder
Functional MRI using blood oxygenation level-dependent (BOLD) contrast indirectly probes neuronal activity via evoked cerebral blood volume (CBV) and oxygenation changes. Thus, its spatio-temporal characteristics are determined by vascular physiology and MRI parameters. In this paper, we focus on the spatial distribution and time course of the fMRI signal and their magnetic field strength dependence. Even though much is still unknown, the following consistent picture is emerging: a) For high spatial resolution imaging, fMRI contrast-to-noise increases supra-linearly with field strength...
February 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/28245206/cerebrovascular-and-cardiovascular-variability-interactions-investigated-through-conditional-joint-transfer-entropy-in-subjects-prone-to-postural-syncope
#6
Vlasta Bari, Beatrice De Maria, Claudio Enrico Mazzucco, Gianluca Rossato, Davide Tonon, Giandomenico Nollo, Luca Faes, Alberto Porta
A model-based conditional transfer entropy approach was exploited to quantify the information transfer in cerebrovascular (CBV) and cardiovascular (CV) systems in subjects prone to develop postural syncope. Spontaneous beat-to-beat variations of mean cerebral blood flow velocity (MCBFV) derived from a transcranial Doppler device, heart period (HP) derived from surface electrocardiogram, mean arterial pressure (MAP) and systolic arterial pressure (SAP) derived from finger plethysmographic arterial pressure device were monitored at rest in supine position (REST) and during 60° head-up tilt (TILT) in 13 individuals (age mean±standard deviation: 28±9 years, min-max range: 18-44 years, 5 males) with a history of recurrent episodes of syncope (SYNC) and in 13 age- and gender-matched controls (NonSYNC)...
February 28, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28244000/changes-in-cerebral-perfusion-with-induced-hypertension-in-aneurysmal-subarachnoid-hemorrhage-a-pilot-and-feasibility-study
#7
Amanda Murphy, Airton Leonardo de Oliveira Manoel, R Loch Macdonald, Andrew Baker, Ting-Yim Lee, Tom Marotta, Walter Montanera, Richard Aviv, Aditya Bharatha
BACKGROUND: The effects of induced hypertension (IH) on cerebral perfusion after subarachnoid hemorrhage (SAH) are unclear. The objectives of this investigation are to: (1) determine whether there are differences in cerebral blood flow (CBF), cerebral blood volume (CBV), and mean transit time (MTT) measured with computed tomography perfusion (CTP) before and after IH; (2) evaluate differences in the presence of infarction and clinical outcome between patients with and without IH. METHODS: We performed a retrospective cohort analysis of 25 aneurysmal SAH patients...
February 27, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28237366/ct-perfusion-diagnoses-delayed-cerebral-ischemia-in-the-early-stage-of-the-time-window-after-aneurysmal-subarachnoid-hemorrhage
#8
Haogeng Sun, Wanjiang Li, Junpeng Ma, Yi Liu, Chao You
BACKGROUND AND PURPOSE: It has been acknowledged that delayed cerebral ischemia (DCI) after aneurysmal subarachnoid hemorrhage (SAH) can be diagnosed by CT perfusion (CTP) in the DCI time-window. We evaluated the diagnostic accuracy of CTP for DCI during the early stage of the time-window. MATERIALS AND METHODS: We prospectively enrolled patients with aneurysmal SAH. DCI was defined as both new cerebral infarction and clinical deterioration after SAH. CTP was performed by using a standardized protocol with predefined regions of interest in 4 to 6 days after SAH...
February 22, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28227393/an-integrated-neuroprotective-intervention-for-brain-ischemia-validated-by-ecog-fpam
#9
Yu-Hang Liu, Lun-De Liao, Su Jing Chan, Aishwarya Bandla, Nitish V Thakor, Yu-Hang Liu, Lun-De Liao, Su Jing Chan, Aishwarya Bandla, Nitish V Thakor, Yu-Hang Liu, Aishwarya Bandla, Nitish V Thakor, Su Jing Chan, Lun De Liao
Brain ischemia is a neurological deficit caused by a reduction in the blood supply to tissue, and one of the leading causes of disability in the world. Currently, the most well-known therapeutic agent for ischemia recovery is recombinant tissue plasminogen activator (rtPA), but it is viable for only a small portion (approximately 3.6%) of ischemic patients and may cause side effects such as tissue damage. Thus, introducing a new therapeutic concept for ischemia, we proposed an integrated intervention combining global and focal stimulations in this article...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28219193/-analysis-of-ct-perfusion-imaging-in-chronic-cerebral-circulatory-insufficiency-and-its-relationship-with-crossed-cerebellar-diaschisis
#10
S L Liu, Y Wang, Y Zhang, H L Xu, J C Wang, W W He, X T Qin, G Q Cao, Y J Yang, Q C Zhuge, W J Chen
Objective: To investigate the change of cerebral microcirculation of chronic cerebral circulation insufficiency(CCCI) patients and the relationship between CCCI and crossed cerebellar diaschisis(CCD)by using 320-detector row of low-dose volume CT perfusion imaging. Methods: A total of 158 patients (103 males, 55 females, from 45 to 82 years old, the mean age was 62.9) with symptoms of CCCI were admitted to the First Affiliated Hospital of Wenzhou Medical University from June 2013 to January 2016. Low-dose CTP imaging of whole brain was performed to them using 320-detector row volume CT scanner...
February 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28209583/combining-diffusion-tensor-metrics-and-dsc-perfusion-imaging-can-it-improve-the-diagnostic-accuracy-in-differentiating-tumefactive-demyelination-from-high-grade-glioma
#11
S B Hiremath, A Muraleedharan, S Kumar, C Nagesh, C Kesavadas, M Abraham, T R Kapilamoorthy, B Thomas
BACKGROUND AND PURPOSE: Tumefactive demyelinating lesions with atypical features can mimic high-grade gliomas on conventional imaging sequences. The aim of this study was to assess the role of conventional imaging, DTI metrics (p:q tensor decomposition), and DSC perfusion in differentiating tumefactive demyelinating lesions and high-grade gliomas. MATERIALS AND METHODS: Fourteen patients with tumefactive demyelinating lesions and 21 patients with high-grade gliomas underwent brain MR imaging with conventional, DTI, and DSC perfusion imaging...
February 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28209577/feasibility-of-flat-panel-detector-ct-in-perfusion-assessment-of-brain-arteriovenous-malformations-initial-clinical-experience
#12
M Garcia, T W Okell, M Gloor, M A Chappell, P Jezzard, O Bieri, J V Byrne
The different results from flat panel detector CT in various pathologies have provoked some discussion. Our aim was to assess the role of flat panel detector CT in brain arteriovenous malformations, which has not yet been assessed. Five patients with brain arteriovenous malformations were studied with flat panel detector CT, DSC-MR imaging, and vessel-encoded pseudocontinuous arterial spin-labeling. In glomerular brain arteriovenous malformations, perfusion was highest next to the brain arteriovenous malformation with decreasing values with increasing distance from the lesion...
February 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28167348/3d-functional-ultrasound-imaging-of-the-cerebral-visual-system-in-rodents
#13
Marc Gesnik, Kevin Blaize, Thomas Deffieux, Jean-Luc Gennisson, José-Alain Sahel, Mathias Fink, Serge Picaud, Mickaël Tanter
3D functional imaging of the whole brain activity during visual task is a challenging task in rodents due to the complex tri-dimensional shape of involved brain regions and the fine spatial and temporal resolutions required to reveal the visual tract. By coupling functional ultrasound (fUS) imaging with a translational motorized stage and an episodic visual stimulation device, we managed to accurately map and to recover the activity of the visual cortices, the Superior Colliculus (SC) and the Lateral Geniculate Nuclei (LGN) in 3D...
February 3, 2017: NeuroImage
https://www.readbyqxmd.com/read/28138001/multiparametric-magnetic-resonance-imaging-for-prediction-of-parenchymal-hemorrhage-in-acute-ischemic-stroke-after-reperfusion-therapy
#14
Kambiz Nael, James R Knitter, Reza Jahan, Jeffery Gornbein, Zahra Ajani, Lei Feng, Brett C Meyer, Lee H Schwamm, Albert J Yoo, Randolph S Marshall, Philip M Meyers, Dileep R Yavagal, Max Wintermark, David S Liebeskind, Judy Guzy, Sidney Starkman, Jeffrey L Saver, Chelsea S Kidwell
BACKGROUND AND PURPOSE: Patients with acute ischemic stroke are at increased risk of developing parenchymal hemorrhage (PH), particularly in the setting of reperfusion therapies. We have developed a predictive model to examine the risk of PH using combined magnetic resonance perfusion and diffusion parameters, including cerebral blood volume (CBV), apparent diffusion coefficient, and microvascular permeability (K2). METHODS: Voxel-based values of CBV, K2, and apparent diffusion coefficient from the ischemic core were obtained using pretreatment magnetic resonance imaging data from patients enrolled in the MR RESCUE clinical trial (Mechanical Retrieval and Recanalization of Stroke Clots Using Embolectomy)...
March 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28137548/intraoperative-mr-imaging-of-cerebral-oxygen-metabolism-during-resection-of-brain-lesions
#15
REVIEW
Andreas Stadlbauer, Andreas Merkel, Max Zimmermann, Björn Sommer, Michael Buchfelder, Anke Meyer-Bäse, Karl Rössler
OBJECTIVE: Tissue oxygen tension is an important parameter for brain tissue viability and its non-invasive intraoperative monitoring in the whole brain is of highly clinical relevance. The purpose of this study was the introduction of a multiparametric quantitative blood oxygenation dependent (qBOLD) MRI approach for intraoperative examination of oxygen metabolism during the resection of brain lesions. METHODS: Sixteen patients suffering from brain lesions were intraoperatively examined twice (before craniotomy and after gross-total resection) using the qBOLD technique and a 1...
January 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28101911/comparison-of-cbv-beam-and-beac-high-dose-chemotherapy-followed-by-autologous-hematopoietic-stem-cell-transplantation-in-non-hodgkin-lymphoma-efficacy-and-toxicity
#16
Youwu Shi, Peng Liu, Shengyu Zhou, Jianliang Yang, Xiaohong Han, Xiaohui He, Changgong Zhang, Lin Gui, Yan Qin, Sheng Yang, Liya Zhao, Jiarui Yao, Bo Jia, Shuxiang Zhang, Yan Sun, Yuankai Shi
AIM: Limited data are available to guide the choice of conditioning regimen before autologous hematopoietic stem cell transplantation (AHSCT) for patients with lymphoma. METHODS: We analyzed 129 non-Hodgkin lymphoma patients who underwent AHSCT from 1996 to 2013 using the most common regimens: CBV (cyclophosphamide, carmustine and etoposide; n = 16), BEAM (carmustine, etoposide, cytarabine and melphalan; n = 36) and BEAC (carmustine, etoposide, cytarabine and cyclophosphamide; n = 77)...
January 19, 2017: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28094088/usefulness-of-multiparametric-computerized-tomography-findings-in-the-differential-diagnosis-of-stroke-mimics-of-epileptic-origin-a-preliminary-study
#17
R López Ruiz, S Quintas, P Largo, M de Toledo, M T Carreras, A Gago-Veiga, R Manzanares, J Vivancos
OBJECTIVE: Thirty percent of the patients for whom code stroke is activated have stroke mimics, the most common being epilepsy. Our purpose was to evaluate the usefulness of multiparametric CT for differentiating between seizure-related symptoms and vascular events. MATERIAL AND METHODS: We conducted a retrospective observational study; data were gathered prospectively during one year. We studied multiparametric CT images of patients admitted following code stroke activation and finally diagnosed with epilepsy...
January 13, 2017: Neurología: Publicación Oficial de la Sociedad Española de Neurología
https://www.readbyqxmd.com/read/28047859/th-ab-207a-10-sub-msv-cerebral-ct-perfusion-imaging-using-prior-image-constrained-compressed-sensing-a-prospective-clinical-trial
#18
K Li, P Yang, M Cathey, J Tang, H Rowley, P Turski, V Prabhakaran, C Strother, G-H Chen
PURPOSE: A prospective clinical study was conducted to assess whether sub-mSv cerebral CT perfusion (CTP) imaging can be achieved using the Prior Image Constrained Compressed Sensing (PICSS) reconstruction algorithm. METHODS: Following a standard dose (SD) CTP acquisition, 31 patients (median age, 62 years; 15 M/16 F; median BMI, 27) underwent an additional reduced dose (RD) CTP acquisition at 20% of the standard dose level. Several algorithms (PICCS, ASIR, and FBP) were used to reconstruct CTP source images of the RD series...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047502/su-g-iep1-04-comparison-of-cerebral-blood-volume-estimated-by-dsc-and-dcemri
#19
M Aryal, Y Cao
PURPOSE: The cerebral blood volume (CBV) is commonly estimated from T2*/T2-weighted dynamic susceptibility contrast (DSC) MRI acquired by an EPI sequence. There are several challenges with DSC imaging, including geometric distortion, limited brain spatial coverage, and unreliable arterial input function (AIF) due to the partial volume effect. However, CBV can be estimated from T1-weighted dynamic contrast enhanced (DCE) MRI. This study aimed to examine whether CBV estimated from DCE-MRI is comparable to one from DSC-MRI...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28043909/magnetic-resonance-fingerprinting-based-on-realistic-vasculature-in-mice
#20
Philippe Pouliot, Louis Gagnon, Tina Lam, Pramod K Avti, Chris Bowen, Michèle Desjardins, Ashok K Kakkar, Eric Thorin, Sava Sakadzic, David A Boas, Frédéric Lesage
Magnetic resonance fingerprinting (MRF) was recently proposed as a novel strategy for MR data acquisition and analysis. A variant of MRF called vascular MRF (vMRF) followed, that extracted maps of three parameters of physiological importance: cerebral oxygen saturation (SatO2), mean vessel radius and cerebral blood volume (CBV). However, this estimation was based on idealized 2-dimensional simulations of vascular networks using random cylinders and the empirical Bloch equations convolved with a diffusion kernel...
December 31, 2016: NeuroImage
keyword
keyword
44316
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"