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Arterial spin labeling

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https://www.readbyqxmd.com/read/28924181/common-and-dissociable-regional-cerebral-blood-flow-differences-associate-with-dimensions-of-psychopathology-across-categorical-diagnoses
#1
A N Kaczkurkin, T M Moore, M E Calkins, R Ciric, J A Detre, M A Elliott, E B Foa, A Garcia de la Garza, D R Roalf, A Rosen, K Ruparel, R T Shinohara, C H Xia, D H Wolf, R E Gur, R C Gur, T D Satterthwaite
The high comorbidity among neuropsychiatric disorders suggests a possible common neurobiological phenotype. Resting-state regional cerebral blood flow (CBF) can be measured noninvasively with magnetic resonance imaging (MRI) and abnormalities in regional CBF are present in many neuropsychiatric disorders. Regional CBF may also provide a useful biological marker across different types of psychopathology. To investigate CBF changes common across psychiatric disorders, we capitalized upon a sample of 1042 youths (ages 11-23 years) who completed cross-sectional imaging as part of the Philadelphia Neurodevelopmental Cohort...
September 19, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28923528/arterial-spin-labeling-hyperperfusion-in-rasmussen-s-encephalitis-is-it-due-to-focal-brain-inflammation-or-a-post-ictal-phenomenon
#2
Savith Kumar, Chinmay P Nagesh, Bejoy Thomas, Ashalatha Radhakrishnan, Ramshekhar N Menon, Chandrasekharan Kesavadas
BACKGROUND AND PURPOSE: The study evaluated the utility of Arterial spin labeling (ASL) perfusion imaging in Rasmussen's Encephalitis (RE). MATERIAL AND METHODS: The hospital electronic database was searched using the search words "encephalitis," "autoimmune encephalitis" and "Rasmussen's encephalitis" for the period of 1 Jan 2015 to 31 Jan 2017. Clinically diagnosed cases of RE for which epilepsy protocol magnetic resonance imaging (MRI) with perfusion imaging (ASL) performed on a 3T scanner were retrieved...
September 15, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28919569/spontaneous-hemorrhagic-glioblastoma-revealed-by-arterial-spin-labeling
#3
Sarah Fadili, Bruno Law Ye, Nadya Pyatigorskaya
We report a case of a haemorrhagic tumor early detected by pseudo-continuous arterial spin labeling sequence (pCASL) in the case where conventional MRI sequences where not contributive.
September 14, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28917591/increased-left-prefrontal-brain-perfusion-after-mri-compatible-tdcs-attenuates-momentary-ruminative-self-referential-thoughts
#4
Chris Baeken, Jonathan Remue, Marie-Anne Vanderhasselt, Andre R Brunoni, Sara De Witte, Romain Duprat, Ernst H W Koster, Rudi De Raedt, Guo-Rong Wu
BACKGROUND: Transcranial direct current stimulation (tDCS) is a non-invasive electrical stimulation technique, assumed to influence cognition and emotional processing. OBJECTIVE: However, it is unclear how tDCS influences spontaneous cognitive processes such as momentary self-referential thoughts on the neuronal level. METHODS: Forty healthy female volunteers participated in a single session sham-controlled crossover tDCS study while being in the MRI scanner...
September 6, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28915102/acceleration-selective-arterial-spin-labeling-mr-angiography-used-to-visualize-distal-cerebral-arteries-and-collateral-vessels-in-moyamoya-disease
#5
Osamu Togao, Akio Hiwatashi, Makoto Obara, Koji Yamashita, Kazufumi Kikuchi, Ryotaro Kamei, Ataru Nishimura, Koichi Arimura, Koji Yoshimoto, Koji Iihara, Marc Van Cauteren, Hiroshi Honda
Purpose To evaluate and compare the performance of acceleration-selective arterial spin labeling (AccASL) magnetic resonance (MR) angiography in the visualization of cerebral arteries and collateral vessels in patients with Moyamoya disease with that of time-of-flight (TOF) MR angiography, with digital subtraction angiography (DSA) as the reference standard. Materials and Methods Thirty-six cerebral hemispheres from 22 patients with Moyamoya disease underwent TOF and AccASL MR angiography and DSA. Qualitative evaluations included imaging of the terminal internal carotid artery (ICA), distal middle cerebral arteries (MCAs), Moyamoya vessels, and leptomeningeal anastomosis (LMA) collaterals with reference to DSA...
September 15, 2017: Radiology
https://www.readbyqxmd.com/read/28913838/simultaneous-acquisition-of-perfusion-image-and-dynamic-mr-angiography-using-time-encoded-pseudo-continuous-asl
#6
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/28912280/added-value-of-arterial-spin-labeling-mr-imaging-for-the-differentiation-of-cerebellar-hemangioblastoma-from-metastasis
#7
K M Kang, C-H Sohn, S-H You, J G Nam, S H Choi, T J Yun, R-E Yoo, J-H Kim
BACKGROUND AND PURPOSE: In adults with only cerebellar masses, hemangioblastoma and metastasis are the 2 most important differential diagnoses. Our aim was to investigate the added value of arterial spin-labeling MR imaging for differentiating hemangioblastoma from metastasis in patients with only cerebellar masses. MATERIALS AND METHODS: This retrospective study included a homogeneous cohort comprising patients with only cerebellar masses, including 16 hemangioblastomas and 14 metastases...
September 14, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28904950/quantitative-changes-in-cerebral-perfusion-during-urinary-urgency-in-women-with-overactive-bladder
#8
Nisha G Arya, Steven J Weissbart, Sihua Xu, Rupal Bhavsar, Hengyi Rao
PURPOSE: To quantitatively measure changes in cerebral perfusion in select regions of interest in the brain during urinary urgency in women with overactive bladder (OAB) using arterial spin labeling (ASL). METHODS: Twelve women with OAB and 10 controls underwent bladder filling and rated urinary urgency (scale 0-10). ASL fMRI scans were performed (1) in the low urgency state after voiding and (2) high urgency state after drinking oral fluids. Absolute regional cerebral blood flow (rCBF) in select regions of interest was compared between the low and high urgency states...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28894884/characterization-of-skull-base-lesions-using-pseudo-continuous-arterial-spin-labeling
#9
B Geerts, D Leclercq, S Tezenas du Montcel, B Law-Ye, S Gerber, D Bernardeschi, D Galanaud, D Dormont, N Pyatigorskaya
PURPOSE: Pseudo-continuous arterial spin labeling (pCASL) is a non-invasive magnetic resonance (MR) perfusion technique. Our study aimed at estimating the diagnostic performance of the pCASL sequence in assessing the perfusion of skull base lesions both qualitatively and quantitatively and at providing cut-off values for differentiation of specific skull base lesions. METHODS: In this study 99 patients with histopathologically confirmed skull base lesions were retrospectively enrolled...
September 11, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28891911/delineating-the-trajectory-of-cognitive-recovery-from-general-anesthesia-in-older-adults-design-and-rationale-of-the-torie-trajectory-of-recovery-in-the-elderly-project
#10
Joshua S Mincer, Mark G Baxter, Patrick J McCormick, Mary Sano, Arthur E Schwartz, Jess W Brallier, Heather G Allore, Bradley N Delman, Margaret C Sewell, Prantik Kundu, Cheuk Ying Tang, Angela Sanchez, Stacie G Deiner
BACKGROUND: Mechanistic aspects of cognitive recovery after anesthesia and surgery are not yet well characterized, but may be vital to distinguishing the contributions of anesthesia and surgery in cognitive complications common in the elderly such as delirium and postoperative cognitive dysfunction. This article describes the aims and methodological approach to the ongoing study, Trajectory of Recovery in the Elderly (TORIE), which focuses on the trajectory of cognitive recovery from general anesthesia...
September 7, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28888770/test-retest-reliability-of-cerebral-blood-flow-in-healthy-individuals-using-arterial-spin-labeling-findings-from-the-embarc-study
#11
Jorge R C Almeida, Tsafrir Greenberg, Hanzhang Lu, Henry W Chase, Jay Fournier, Crystal M Cooper, Thilo Deckersbach, Phil Adams, Thomas Carmody, Mauricio Fava, Benji Kurian, Patrick J McGrath, Melvin McInnis, Maria A Oquendo, Ramin Parsey, Myrna Weissman, Madhukar Trivedi, Mary L Phillips
INTRODUCTION: Previous investigations of test-retest reliability of cerebral blood flow (CBF) at rest measured with pseudo-continuous Arterial Spin Labeling (pCASL) demonstrated good reliability, but are limited by the use of similar scanner platforms. In the present study we examined test-retest reliability of CBF in regions implicated in emotion and the default mode network. MATERIAL AND METHODS: We measured absolute and relative CBF at rest in thirty-one healthy subjects in two scan sessions, one week apart, at four different sites and three different scan platforms...
September 6, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28887087/a-systematic-study-of-the-sensitivity-of-partial-volume-correction-methods-for-the-quantification-of-perfusion-from-pseudo-continuous-arterial-spin-labeling-mri
#12
Moss Y Zhao, Melvin Mezue, Andrew R Segerdahl, Thomas W Okell, Irene Tracey, Yingyi Xiao, Michael A Chappell
Arterial spin labeling (ASL) MRI is a non-invasive technique for the quantification of cerebral perfusion, and pseudo-continuous arterial spin labeling (PCASL) has been recommended as the standard implementation by a recent consensus of the community. Due to the low spatial resolution of ASL images, perfusion quantification is biased by partial volume effects. Consequently, several partial volume correction (PVEc) methods have been developed to reduce the bias in gray matter (GM) perfusion quantification. The efficacy of these methods relies on both the quality of the ASL data and the accuracy of partial volume estimates...
September 5, 2017: NeuroImage
https://www.readbyqxmd.com/read/28885752/dual-echo-asl-contributes-to-decrypting-the-link-between-functional-connectivity-and-cerebral-blow-flow
#13
Silvia F Storti, Ilaria Boscolo Galazzo, Stefania Montemezzi, Gloria Menegaz, Francesca B Pizzini
Arterial spin labeling (ASL) MRI with a dual-echo readout module (DE-ASL) enables noninvasive simultaneous acquisition of cerebral blood flow (CBF)-weighted images and blood oxygenation level dependent (BOLD) contrast. Up to date, resting-state functional connectivity (FC) studies based on CBF fluctuations have been very limited, while the BOLD is still the method most frequently used. The purposes of this technical report were (i) to assess the potentiality of the DE-ASL sequence for the quantification of resting-state FC and brain organization, with respect to the conventional BOLD (cvBOLD) and (ii) to investigate the relationship between a series of complex network measures and the CBF information...
September 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28884708/dual-echo-asl-based-assessment-of-motor-networks-a-feasibility-study
#14
Silvia Francesca Storti, Ilaria Boscolo Galazzo, Francesca B Pizzini, Gloria Menegaz
OBJECTIVE: Dual-echo arterial spin labeling (DE-ASL) techniques have been recently proposed for the simultaneous acquisition of ASL and blood-oxygenation-level-dependent (BOLD)-functional magnetic resonance imaging (fMRI) data. The assessment of this technique in detecting functional connectivity at rest or during motor and motor imagery tasks is still unexplored both per-se and in comparison with conventional methods. The purpose is to quantify the sensitivity of the DE-ASL sequence with respect to the conventional fMRI sequence (cvBOLD) in detecting brain activations, and to assess and compare the relevance of node features in decoding the network structure...
September 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28879895/perfusion-mr-imaging-of-enhancing-brain-tumors-comparison-of-arterial-spin-labeling-technique-with-dynamic-susceptibility-contrast-technique
#15
Neetu Soni, Devender Pal S Dhanota, Sunil Kumar, Awadhesh K Jaiswal, Arun K Srivastava
OBJECTIVE: Arterial spin labeling (ASL) magnetic resonance (MR) perfusion is a noninvasive and repeatable method for quantitatively measuring cerebral blood flow (CBF). This study aims to compare measurements of ASL-derived CBF with dynamic susceptibility contrast (DSC) MRI in the assessment of enhancing brain tumors (primary and metastatic), with an aim to use ASL as an alternative to DSC. MATERIALS AND METHODS: Thirty patients with newly diagnosed brain tumors (16 meningiomas, 6 gliomas, 3 metastases, 2 cerebellopontine angle schwannoma, 1 central neurocytoma, and 2 low-grade gliomas) were examined using a 3T MR scanner...
September 2017: Neurology India
https://www.readbyqxmd.com/read/28879882/arterial-spin-labelling-a-novel-promising-perfusion-technique-can-it-be-a-replacement-to-dynamic-susceptibility-contrast-mri
#16
Sona A Pungavkar, Rama Yanamandala
No abstract text is available yet for this article.
September 2017: Neurology India
https://www.readbyqxmd.com/read/28879881/can-arterial-spin-labelling-really-replace-dynamic-susceptibility-contrast-perfusion-techniques-for-assessing-brain-tumours-in-clinical-practice
#17
Markand D Patel, Vijay Sawlani
No abstract text is available yet for this article.
September 2017: Neurology India
https://www.readbyqxmd.com/read/28877824/quantifying-the-cerebral-hemodynamic-changes-in-hypertensive-patients-using-3d-pseudo-continuous-arterial-spin-labeling
#18
Ting Wang, Yan-Hua Li, Xin-Hong Guo, Lin Ma, Xin Lou
Objective To investigate the cerebral hemodynamic changes in hypertensive patients using 3D pseudo-continuous arterial spin labeling(3D pCASL).Methods Fifty-eight hypertensive subjects and thirty-four age-matched healthy volunteers were recruited and scanned using the 3D whole-brain pCASL sequence.The regional cerebral blood flow(CBF)values were achieved based on 3D pCASL with SPM8 technique and were manually drawn. Results Compared with healthy volunteers,hypertensive patients had significantly lower CBF values in various regions,with statistical difference at the bilateral centrum semiovale(P=0...
August 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/28871999/multimodal-magnetic-resonance-imaging-of-treatment-induced-changes-to-diffuse-infiltrating-pontine-gliomas-in-children-and-correlation-to-patient-progression-free-survival
#19
Raphael Calmon, Stephanie Puget, Pascale Varlet, Kevin Beccaria, Thomas Blauwblomme, David Grevent, Christian Sainte-Rose, David Castel, Christelle Dufour, Frédéric Dhermain, Stéphanie Bolle, Ana Saitovitch, Monica Zilbovicius, Francis Brunelle, Jacques Grill, Nathalie Boddaert
PURPOSE: To use multimodal magnetic resonance imaging (MRI) to quantify treatment-induced changes in the whole volume of diffuse infiltrating pontine gliomas and correlate them with progression-free survival (PFS). METHODS AND MATERIALS: This prospective study included 22 children aged 3.3 to 14.7 years (median, 5.9 years). Multimodal MRI was performed at 3 distinct time points: before treatment, the first week following radiation therapy (RT), and 2 months after RT...
October 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28868513/evaluation-of-renal-blood-flow-in-chronic-kidney-disease-using-arterial-spin-labeling-perfusion-magnetic-resonance-imaging
#20
Lu-Ping Li, Huan Tan, Jon M Thacker, Wei Li, Ying Zhou, Orly Kohn, Stuart M Sprague, Pottumarthi V Prasad
INTRODUCTION: Chronic kidney disease (CKD) is known to be associated with reduced renal blood flow. However, data to-date in humans is limited. METHODS: In this study, non-invasive arterial spin labeling (ASL) MRI data was acquired in 33 patients with diabetes and stage-3 CKD, and 30 healthy controls. RESULTS: A significantly lower renal blood flow both in cortex (108.4±36.4 vs. 207.3±41.8; p<0.001, d=2.52) and medulla (23.2±8.9 vs. 42...
January 2017: KI Reports
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