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ASL and MRI

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https://www.readbyqxmd.com/read/29135072/measuring-human-placental-blood-flow-with-multidelay-3d-grase-pseudocontinuous-arterial-spin-labeling-at-3t
#1
Xingfeng Shao, Dapeng Liu, Thomas Martin, Teresa Chanlaw, Sherin U Devaskar, Carla Janzen, Aisling M Murphy, Daniel Margolis, Kyunghyun Sung, Danny J J Wang
BACKGROUND: Placenta influences the health of both a woman and her fetus during pregnancy. Maternal blood supply to placenta can be measured noninvasively using arterial spin labeling (ASL). PURPOSE: To present a multidelay pseudocontinuous arterial spin labeling (pCASL) combined with a fast 3D inner-volume gradient- and spin-echo (GRASE) imaging technique to simultaneously measure placental blood flow (PBF) and arterial transit time (ATT), and to study PBF and ATT evolution with gestational age during the second trimester...
November 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29134725/reproducibility-of-brain-mri-segmentation-algorithms-empirical-comparison-of-local-map-pstaple-freesurfer-and-fsl-first
#2
Clemente Velasco-Annis, Alireza Akhondi-Asl, Aymeric Stamm, Simon K Warfield
BACKGROUND AND PURPOSE: Segmentation of human brain structures is crucial for the volumetric quantification of brain disease. Advances in algorithmic approaches have led to automated techniques that save time compared to interactive methods. Recently, the utility and accuracy of template library fusion algorithms, such as Local MAP PSTAPLE (PSTAPLE), have been demonstrated but there is little guidance regarding its reproducibility compared to single template-based algorithms such as FreeSurfer and FSL-FIRST...
November 14, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29114921/association-of-early-left-ventricular-dysfunction-with-advanced-magnetic-resonance-white-matter-and-gray-matter-brain-measures-the-cardia-study
#3
Anderson C Armstrong, Majon Muller, Bharath Ambale-Ventakesh, Michael Halstead, Satoru Kishi, Nick Bryan, Stephen Sidney, Luís C L Correia, Samuel S Gidding, Lenore J Launer, João A C Lima
INTRODUCTION: Relations between heart failure and clinically manifested stroke are well known, but the associations between heart and brain early abnormalities are not totally clear. AIMS: We explore relations of subclinical brain abnormalities with early cardiac dysfunction in a large healthy middle-aged biracial cohort. METHODS: The CARDIA study enrolled 5115 young adults aged 18-30 years at baseline (1985-1986). We assessed 719 Caucasian and African American participants of the CARDIA study, with echocardiograms and brain MRI at follow-up year 25 (2010-2011)...
November 8, 2017: Echocardiography
https://www.readbyqxmd.com/read/29105017/patch-based-local-learning-method-for-cerebral-blood-flow-quantification-with-arterial-spin-labeling-mri
#4
Hancan Zhu, Guanghua He, Ze Wang
Arterial spin-labeling (ASL) perfusion MRI is a non-invasive method for quantifying cerebral blood flow (CBF). Standard ASL CBF calibration mainly relies on pair-wise subtraction of the spin-labeled images and controls images at each voxel separately, ignoring the abundant spatial correlations in ASL data. To address this issue, we previously proposed a multivariate support vector machine (SVM) learning-based algorithm for ASL CBF quantification (SVMASLQ). But the original SVMASLQ was designed to do CBF quantification for all image voxels simultaneously, which is not ideal for considering local signal and noise variations...
November 6, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29095282/skull-metastases-detecting-on-arterial-spin-labeling-perfusion-three-case-reports-and-review-of-literature
#5
REVIEW
Kyeong H Ryu, Hye J Baek, Soo B Cho, Jin I Moon, Bo H Choi, Sung E Park, Hyo J An
RATIONALE: Detection of skull metastases is as important as detection of brain metastases because early diagnosis of skull metastases is a crucial determinant of treatment. However, the skull can be a blind spot for assessing metastases on routine brain magnetic resonance imaging (MRI). To the best of our knowledge, the finding of skull metastases on arterial spin labeling (ASL) has not been reported. ASL is a specific MRI sequence for evaluating cerebral blood flow using magnetized endogenous inflow blood...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29065769/imaging-of-cerebrovascular-function-in-chronic-traumatic-brain-injury
#6
Franck Amyot, Kimbra Kenney, Carol Moore, Maraglit Harber, L Christine Turtzo, Christian N Shenouda, Erika Silverman, Yunhua Gong, Bao-Xi Qu, Leah Harburg, Hangzang Lu, Eric Wassermann, Ramon Diaz-Arrastia
Traumatic cerebrovascular injury (TCVI) is a common pathologic mechanism of traumatic brain injury (TBI) and presents an attractive target for intervention. The aims of this study were to assess cerebral blood flow (CBF) and cerebrovascular reactivity (CVR) using magnetic resonance imaging (MRI), to assess their value as biomarkers of TCVI in chronic TBI, characterize the spatial distribution of TCVI, and assess the relationships between each biomarker and neuropsychological and clinical assessments. 42 subjects (27 chronic TBI, 15 age and gender-matched healthy volunteers) were studied cross-sectionally...
October 25, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29062276/enhancing-innovation-and-underlying-neural-mechanisms-via-cognitive-training-in-healthy-older-adults
#7
Sandra B Chapman, Jeffrey S Spence, Sina Aslan, Molly W Keebler
Non-invasive interventions, such as cognitive training (CT) and physical exercise, are gaining momentum as ways to augment both cognitive and brain function throughout life. One of the most fundamental yet little studied aspects of human cognition is innovative thinking, especially in older adults. In this study, we utilize a measure of innovative cognition that examines both the quantity and quality of abstracted interpretations. This randomized pilot trial in cognitively normal adults (56-75 years) compared the effect of cognitive reasoning training (SMART) on innovative cognition as measured by Multiple Interpretations Measure (MIM)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29043712/uterus-dysplasia-associated-with-cervico-vaginal-agenesis
#8
Ali Mahdavi, Hadi Mirfazaelian, Ladan Younesi Asl, Zeynab Hasani, Maryam Bahreini
Müllerian ducts can form upper parts of normal female reproductive system and any failure in ductal fusion may result in to müllerian duct anomalies (MDA). We present a case of MDA and a uterus dysplasia with no evidence of cervical or upper vaginal tissue. This case showes the role of magnetic resonace imaging (MRI) on MDA diagnosis and urges the need for a unified reliable and practical classification more compatible with clinical practice.
January 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29034514/measurement-of-murine-single-kidney-glomerular-filtration-rate-using-dynamic-contrast-enhanced-mri
#9
Kai Jiang, Hui Tang, Prasanna K Mishra, Slobodan I Macura, Lilach O Lerman
PURPOSE: To develop and validate a method for measuring murine single-kidney glomerular filtration rate (GFR) using dynamic contrast-enhanced MRI (DCE-MRI). METHODS: This prospective study was approved by the Institutional Animal Care and Use Committee. A fast longitudinal relaxation time (T1 ) measurement method was implemented to capture gadolinium dynamics (1 s/scan), and a modified two-compartment model was developed to quantify GFR as well as renal perfusion using 16...
October 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29033829/exercise-training-increases-parietal-lobe-cerebral-blood-flow-in-chronic-stroke-an-observational-study
#10
Andrew D Robertson, Susan Marzolini, Laura E Middleton, Vincenzo S Basile, Paul I Oh, Bradley J MacIntosh
Exercise is increasingly recommended as an essential component of stroke rehabilitation, yet uncertainty remains with respect to its direct effect on the cerebral vasculature. The current study first demonstrated the repeatability of pseudo-continuous arterial spin labeling (ASL) magnetic resonance imaging (MRI) in older adults with stroke, and then investigated the change in cerebrovascular function following a 6-month cardiovascular rehabilitation program. In the repeatability study, 12 participants at least 3 months post-stroke underwent two ASL imaging scans 1 month apart...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28978533/non-invasive-measurement-of-renal-blood-flow-by-magnetic-resonance-imaging-mri-in-rats
#11
Cesar A Romero, Glauber Cabral, Robert A Knight, Guangliang Ding, Edward L Peterson, Oscar A Carretero
Renal blood flow (RBF) provides important information regarding renal physiology and nephropathies. Arterial spin labeling-magnetic resonance imaging (ASL-MRI) is a non-invasive method of measuring blood flow without exogenous contrast media. However, low signal/noise ratio and respiratory motion artifacts are challenges for RBF measurements in small animals. Our objective was to evaluate the feasibility and reproducibility of RBF measures by ASL-MRI using respiratory-gating and navigator correction methods to reduce motion artifacts...
October 4, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28974274/subjective-cognitive-decline-modifies-the-relationship-between-cerebral-blood-flow-and-memory-function-in-cognitively-normal-older-adults
#12
Chelsea C Hays, Zvinka Z Zlatar, Laura Campbell, M J Meloy, Christina E Wierenga
OBJECTIVES: Subjective cognitive decline (SCD), or self-reported cognitive decline despite normal neuropsychological test performance, is a risk factor for objective cognitive decline and Alzheimer's disease (AD). While brain mechanisms contributing to SCD are not well defined, studies show associations with vascular risk factors and altered cerebral blood flow (CBF), raising the hypothesis that those with SCD might be experiencing vascular dysregulation, or a disruption in the normal relationship between CBF and cognition...
October 4, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28966828/sequential-changes-of-arterial-spin-labeling-perfusion-mr-images-with-dual-postlabeling-delay-following-reconstructive-surgery-for-giant-internal-carotid-artery-aneurysm
#13
Takafumi Shimogawa, Takato Morioka, Tomoaki Akiyama, Sei Haga, Shuji Arakawa, Tetsuro Sayama
BACKGROUND: Arterial spin-labeling magnetic resonance perfusion imaging (ASL-MRI) allows noninvasive measurement of cerebral blood flow (CBF) but depends on arterial transit time (ATT). To overcome this problem, we developed a simple ASL technique with dual postlabeling delay (PLD) settings. In addition to the routinely used PLD of 1.5 seconds, we selected another PLD of 2.5 seconds to assess slowly streaming blood flow and detect arterial transit artifacts (ATAs) resulting from stagnant intravascular magnetically labeled spins...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28952228/differentiation-between-progression-and-pseudoprogresion-by-arterial-spin-labeling-mri-in-patients-with-glioblastoma-multiforme
#14
Marija Jovanovic, Sandra Radenkovic, Tatjana Stosic-Opincal, Slobodan Lavrnic, Svetlana Gavrilovic, Biljana Lazovic-Popovic, Ivan Soldatovic, Ruzica Maksimovic
PURPOSE: To compare arterial spin labeling (ASL) perfusion technique with the clinically established dynamic susceptibility contrast-enhanced (DSC) perfusion weighted-imaging (PWI), and to determine its value in routine MRI evaluation of disease progression in patients with glioblastoma multiforme (GBM). METHODS: A prospective intraindividual study was performed in 31 patients with histologically proven GBM who had clinical and/or radiological deterioration after treatment, including surgery, radiotherapy and therapy with temozolomide...
July 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28939189/cerebral-blood-flow-velocity-positively-correlates-with-brain-volumes-in-long-term-remitted-depression
#15
Thomas Desmidt, Frédéric Andersson, Bruno Brizard, Jean-Philippe Cottier, Frédéric Patat, Valérie Gissot, Catherine Belzung, Wissam El-Hage, Vincent Camus
BACKGROUND: Mechanisms involved in brain changes observed in major depression have been poorly investigated in clinical populations. Changes in cerebral blood flow (CBF) have been found in depressed patients and constitute a potential mechanism by which brain volume varies in depression. We have tested the association of cerebral blood flow velocity (CBFV) as assessed with Transcranial Doppler (TCD) and cerebral blood flow (CBF) as assessed with Arterial Spin Labeling Magnetic Resonance Imaging (ASL-MRI) with Total Brain Volume (TBV) and the volume of seven subcortical regions, in currently depressed and long-term remitted patients...
September 20, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28930562/alzheimer-s-disease-diagnostics-by-a-3d-deeply-supervised-adaptable-convolutional-network
#16
Ehsan Hosseini-Asl, Mohammed Ghazal, Ali Mahmoud, Ali Aslantas, Ahmed M Shalaby, Manual F Casanova, Gregory N Barnes, Georgy Gimel'farb, Robert Keynton, Ayman El-Baz
Early diagnosis is playing an important role in preventing progress of the Alzheimer's disease (AD). This paper proposes to improve the prediction of AD with a deep 3D Convolutional Neural Network (3D-CNN), which can show generic features capturing AD biomarkers extracted from brain images, adapt to different domain datasets, and accurately classify subjects with improved fine-tuning method. The 3D-CNN is built upon a convolutional autoencoder, which is pre-trained to capture anatomical shape variations in structural brain MRI scans for source domain...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28923528/arterial-spin-labeling-hyperperfusion-in-rasmussen-s-encephalitis-is-it-due-to-focal-brain-inflammation-or-a-postictal-phenomenon
#17
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 18, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
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
#18
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
#19
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/28879895/perfusion-mr-imaging-of-enhancing-brain-tumors-comparison-of-arterial-spin-labeling-technique-with-dynamic-susceptibility-contrast-technique
#20
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
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