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Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging

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https://www.readbyqxmd.com/read/29334161/the-role-of-neurosonology-in-the-diagnosis-and-management-of-patients-with-carotid-artery-disease-a-review
#1
REVIEW
Odysseas Kargiotis, Apostolos Safouris, Georgios Magoufis, Maria Georgala, Andromachi Roussopoulou, Eleftherios Stamboulis, Konstantinos G Moulakakis, Andreas Lazaris, George Geroulakos, Spyros Vasdekis, Georgios Tsivgoulis
Carotid artery disease (CAD) is a common cause of ischemic stroke with high rates of recurrence. Carotid endarterectomy (CEA) or carotid artery stenting (CAS) are highly recommended for the secondary prevention of symptomatic CAD during the first 14 days following the index event of transient ischemic attack or minor stroke. CEA or CAS may also be offered in selected cases with severe asymptomatic stenosis. Herein, we review the utility of neurosonology in the diagnosis and pre-/peri-interventional assessment of CAD patients who undergo carotid revascularization procedures...
January 15, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29319208/image-registration-to-compensate-for-epi-distortion-in-patients-with-brain-tumors-an-evaluation-of-tract-specific-effects
#2
Angela Albi, Antonio Meola, Fan Zhang, Pegah Kahali, Laura Rigolo, Chantal M W Tax, Pelin Aksit Ciris, Walid I Essayed, Prashin Unadkat, Isaiah Norton, Yogesh Rathi, Olutayo Olubiyi, Alexandra J Golby, Lauren J O'Donnell
BACKGROUND AND PURPOSE: Diffusion magnetic resonance imaging (dMRI) provides preoperative maps of neurosurgical patients' white matter tracts, but these maps suffer from echo-planar imaging (EPI) distortions caused by magnetic field inhomogeneities. In clinical neurosurgical planning, these distortions are generally not corrected and thus contribute to the uncertainty of fiber tracking. Multiple image processing pipelines have been proposed for image-registration-based EPI distortion correction in healthy subjects...
January 10, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29319202/analysis-of-brain-spect-images-coregistered-with-mri-in-patients-with-epilepsy-comparison-of-three-methods
#3
Zaiyang Long, Dennis P Hanson, Brian P Mullan, Christopher H Hunt, David R Holmes, Benjamin H Brinkmann, Michael K O'Connor
BACKGROUND AND PURPOSE: SISCOM and STATISCOM were clinically proved to be effective for ictal/inter-ictal single-photon emission computed tomography (SPECT) analysis coregistered with magnetic resonance imaging (MRI) for seizure localization. Recently, a software package also became available for this analysis. This study aimed to investigate and compare the performance of these analysis methods for seizure localization. METHODS: A total of 378 patients who underwent 99m Tc-ethyl cysteinate dimer (ECD) SPECT scans were retrospectively reviewed and 28 remained after applying exclusion criteria...
January 10, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29314393/global-cerebral-atrophy-detected-by-routine-imaging-relationship-with-age-hippocampal-atrophy-and-white-matter-hyperintensities
#4
Omar M Al-Janabi, Pradeep Panuganti, Erin L Abner, Ahmed A Bahrani, Ronan Murphy, Shoshana H Bardach, Allison Caban-Holt, Peter T Nelson, Brian T Gold, Charles D Smith, Donna M Wilcock, Gregory A Jicha
BACKGROUND AND PURPOSE: Interpreting the clinical significance of moderate-to-severe global cerebral atrophy (GCA) is a conundrum for many clinicians, who visually interpret brain imaging studies in routine clinical practice. GCA may be attributed to normal aging, Alzheimer's disease (AD), or cerebrovascular disease (CVD). Understanding the relationships of GCA with aging, AD, and CVD is important for accurate diagnosis and treatment decisions for cognitive complaints. METHODS: To elucidate the relative associations of age, moderate-to-severe white matter hyperintensities (WMHs), and moderate-to-severe medial temporal lobe atrophy (MTA), with moderate-to-severe GCA, we visually rated clinical brain imaging studies of 325 participants from a community based sample...
January 5, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29280236/advanced-pediatric-neurosonography-techniques-contrast-enhanced-ultrasonography-elastography-and-beyond
#5
REVIEW
Misun Hwang, Becky J Riggs, Joseph Katz, Donna Seyfert, Frances Northington, Robinson Shenandoah, Irina Burd, Justin McArthur, Kassa Darge, Matthew A Thimm, Thierry A G M Huisman
Recent technical advances in neurosonography continue broadening the diagnostic utility, sensitivity, and specificity of ultrasound for detecting intracranial abnormalities bed side. The clinical and functional applications of neurosonography have significantly expanded since the 1980s when transcranial Doppler sonography first allowed anatomic and hemodynamic delineation of the intracranial vessels through the thin temporal skull. In the past few years, contrast-enhanced ultrasonography, elastography, 3D/4D reconstruction tools, and high-resolution microvessel imaging techniques have further enhanced the diagnostic significance of neurosonography...
December 27, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29280227/neuroimaging-of-dilated-perivascular-spaces-from-benign-and-pathologic-causes-to-mimics
#6
REVIEW
Jeffrey D Rudie, Andreas M Rauschecker, Seyed A Nabavizadeh, Suyash Mohan
Perivascular spaces (PVSs), also known as Virchow-Robin spaces, are pial-lined, fluid-filled structures found in characteristic locations throughout the brain. They can become abnormally enlarged or dilated and in rare cases can cause hydrocephalus. Dilated PVSs can pose a diagnostic dilemma for radiologists because of their varied appearance, sometimes mimicking more serious entities such as cystic neoplasms, including dysembryoplastic neuroepithelial tumor and multinodular and vacuolating neuronal tumor, or cystic infections including toxoplasmosis and neurocysticercosis...
December 27, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29235194/dual-sensitivity-multiple-sclerosis-lesion-and-csf-segmentation-for-multichannel-3t-brain-mri
#7
Dominik S Meier, Charles R G Guttmann, Subhash Tummala, Nicola Moscufo, Michele Cavallari, Shahamat Tauhid, Rohit Bakshi, Howard L Weiner
BACKGROUND AND PURPOSE: A pipeline for fully automated segmentation of 3T brain MRI scans in multiple sclerosis (MS) is presented. This 3T morphometry (3TM) pipeline provides indicators of MS disease progression from multichannel datasets with high-resolution 3-dimensional T1-weighted, T2-weighted, and fluid-attenuated inversion-recovery (FLAIR) contrast. 3TM segments white (WM) and gray matter (GM) and cerebrospinal fluid (CSF) to assess atrophy and provides WM lesion (WML) volume. METHODS: To address nonuniform distribution of noise/contrast (eg, posterior fossa in 3D-FLAIR) of 3T magnetic resonance imaging, the method employs dual sensitivity (different sensitivities for lesion detection in predefined regions)...
December 13, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29226505/evaluating-the-association-between-enlarged-perivascular-spaces-and-disease-worsening-in-multiple-sclerosis
#8
Michele Cavallari, Svetlana Egorova, Brian C Healy, Miklos Palotai, Juan Carlos Prieto, Mariann Polgar-Turcsanyi, Shahamat Tauhid, Mark Anderson, Bonnie Glanz, Tanuja Chitnis, Charles R G Guttmann
BACKGROUND AND PURPOSE: Enlarged perivascular spaces (EPVSs) have been associated with relapses and brain atrophy in multiple sclerosis (MS). We investigated the association of EPVS with clinical and MRI features of disease worsening in a well-characterized cohort of relapsing-remitting MS patients prospectively followed for up to 10 years. METHODS: Baseline EPVSs were scored on 1.5T MRI in 30 converters to moderate-severe disability, and 30 nonconverters matched for baseline characteristics...
December 11, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29215168/decreased-signal-intensity-ratio-on-mra-reflects-misery-perfusion-on-spect-in-patients-with-intracranial-stenosis
#9
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/29205635/cerebral-white-matter-maturation-patterns-in-preterm-infants-an-mri-t2-relaxation-anisotropy-and-diffusion-tensor-imaging-study
#10
Michael J Knight, Adam Smith-Collins, Sarah Newell, Mark Denbow, Risto A Kauppinen
BACKGROUND AND PURPOSE: Preterm birth is associated with worse neurodevelopmental outcome, but brain maturation in preterm infants is poorly characterized with standard methods. We evaluated white matter (WM) of infant brains at term-equivalent age, as a function of gestational age at birth, using multimodal magnetic resonance imaging (MRI). METHODS: Infants born very preterm (<32 weeks gestation) and late preterm (33-36 weeks gestation) were scanned at 3 T at term-equivalent age using diffusion tensor imaging (DTI) and T2 relaxometry...
December 5, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29205670/neck-vessel-cross-sectional-area-measured-with-mri-scan-rescan-reproducibility-for-longitudinal-evaluations
#11
Laura Pelizzari, Maria Marcella Laganà, Dejan Jakimovski, Niels Bergsland, Jesper Hagemeier, Giuseppe Baselli, Robert Zivadinov
BACKGROUND AND PURPOSE: The cross-sectional area (CSA) of common carotid arteries-internal carotid arteries (CCA-ICAs), vertebral arteries (VAs), and internal jugular veins (IJVs) is influenced by aging. However, the neck vessel CSA can be affected by other factors as well, including subject positioning, hydration, and respiration, especially in longitudinal studies. This study aimed to assess scan-rescan reproducibility of CCA-ICAs, VAs, and IJVs CSA measurements in order to evaluate their feasibility for longitudinal CSA assessments, and to apply the segmentation method on a longitudinal pilot dataset...
December 4, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29205641/clinical-and-arterial-spin-labeling-brain-mri-features-of-transitional-venous-anomalies
#12
Michael Zhang, Nicholas A Telischak, Nancy J Fischbein, Gary K Steinberg, Michael Marks, Greg Zaharchuk, Jeremy J Heit, Michael Iv
BACKGROUND AND PURPOSE: Transitional venous anomalies (TVAs) are rare cerebrovascular lesions that resemble developmental venous anomalies (DVAs), but demonstrate early arteriovenous shunting on digital subtraction angiography (DSA) without the parenchymal nidus of arteriovenous malformations (AVMs). We investigate whether arterial spin labeling (ASL) magnetic resonance imaging (MRI) can distinguish brain TVAs from DVAs and guide their clinical management. METHODS: We conducted a single-center retrospective review of patients with brain parenchymal DVA-like lesions with increased ASL signal on MRI...
December 4, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29134725/reproducibility-of-brain-mri-segmentation-algorithms-empirical-comparison-of-local-map-pstaple-freesurfer-and-fsl-first
#13
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/29134723/the-ct-defined-hyperdense-arterial-sign-as-a-marker-for-acute-intracerebral-large-vessel-occlusion
#14
Jaims Lim, Jordan A Magarik, Michael T Froehler
BACKGROUND AND PURPOSE: To determine the sensitivity and specificity of the hyperdense artery sign (HAS) on thin-slice non-contrast computed tomography (NCCT), combined with brief clinical history, as an indicator for large vessel occlusion (LVO) in the setting of acute ischemic stroke. METHODS: Ninety-nine LVO and 102 non-LVO acute ischemic stroke patients were retrospectively identified from a prospective database at a single institution. After reviewing each patient's neurologic presentation based on his or her initial National Institute of Health Stroke Scale (NIHSS) and neurologic evaluation, all thin (1 mm) and thick (5 mm) NCCT scans were reviewed for the HAS...
November 14, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29124813/a-simplified-quantitative-method-to-measure-brain-shifts-in-patients-with-middle-cerebral-artery-stroke
#15
Nina Paletta, Laith Maali, Abdurrehman Zahran, Sankara Sethuraman, Ramon Figueroa, Fenwick T Nichols, Askiel Bruno
BACKGROUND AND PURPOSE: A standardized and validated method to measure brain shifts in malignant middle cerebral artery (MCA) stroke with decompressive hemicraniectomy (DHC) could facilitate clinical decision making, prognostication, and comparison of results between studies. METHODS: We tested for reliability simplified methods to measure transcalvarial herniation, midline brain shift, and the contralateral cerebral ventricular atrium in malignant MCA stroke after DHC...
November 10, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29076591/long-term-magnetization-transfer-ratio-evolution-in-multiple-sclerosis-white-matter-lesions
#16
Yufan Zheng, Jar-Chi Lee, Richard Rudick, Elizabeth Fisher
BACKGROUND AND PURPOSE: Magnetization transfer ratio (MTR), a magnetic resonance imaging technique used to assess tissue integrity, correlates with demyelination and axonal loss in multiple sclerosis (MS) lesions. In acute white matter lesions, short-term MTR changes mainly reflect demyelination and remyelination, in addition to edema and axonal and glial changes. Long-term MTR changes in MS lesions have not been studied extensively. METHODS: A new quantitative image analysis method was developed to measure long-term MTR changes in MS lesions...
October 27, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29205628/clinical-neuroimaging-using-7-t-mri-challenges-and-prospects
#17
REVIEW
Maria Isabel Vargas, Pascal Martelli, Lijing Xin, Ozlem Ipek, Frederic Grouiller, Francesca Pittau, Robert Trampel, Rolf Gruetter, Serge Vulliemoz, Francois Lazeyras
The aim of this article is to illustrate the principal challenges, from the medical and technical point of view, associated with the use of ultrahigh field (UHF) scanners in the clinical setting and to present available solutions to circumvent these limitations. We would like to show the differences between UHF scanners and those used routinely in clinical practice, the principal advantages, and disadvantages, the different UHFs that are ready be applied to routine clinical practice such as susceptibility-weighted imaging, fluid-attenuated inversion recovery, 3-dimensional time of flight, magnetization-prepared rapid acquisition gradient echo, magnetization-prepared 2 rapid acquisition gradient echo, and diffusion-weighted imaging, the technical principles of these sequences, and the particularities of advanced techniques such as diffusion tensor imaging, spectroscopy, and functional imaging at 7TMR...
January 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28945289/anomalies-and-normal-variants-of-the-cerebral-arterial-supply-a-comprehensive-pictorial-review-with-a-proposed-workflow-for-classification-and-significance
#18
REVIEW
Arsany Hakim, Jan Gralla, Christoph Rozeik, Pasquale Mordasini, Lars Leidolt, Eike Piechowiak, Christoph Ozdoba, Marwan El-Koussy
Cerebral arteries may exhibit a wide range of variation from normal anatomy, which can be incidentally discovered during imaging. Knowledge of such variants is crucial to differentiate them from pathologies, to understand the etiology of certain pathologies directly related to a vascular variant, and to depict the changes in collateral circulation in patients with certain variants. Detection of particular variants may lead to the discovery of other nonvascular or vascular anomalies, especially aneurysms, and may also affect planning of endovascular or neurosurgical interventions...
January 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28736910/longitudinal-mr-spectroscopy-shows-altered-metabolism-in-traumatic-brain-injury
#19
Andrew A Maudsley, Varan Govind, Gaurav Saigal, Stuart G Gold, Leo Harris, Sulaiman Sheriff
BACKGROUND AND PURPOSE: Brain trauma is known to result in heterogeneous patterns of tissue damage and altered neuronal and glial metabolism that evolve over time following injury; however, little is known on the longitudinal evolution of these changes. In this study, magnetic resonance spectroscopic imaging (MRSI) was used to map the distributions of altered metabolism in a single subject at five time points over a period of 28 months following injury. METHODS: Magnetic resonance imaging and volumetric MRSI data were acquired in a subject that had experienced a moderate traumatic brain injury (Glasgow Coma Scale 13) at five time points, from 7 weeks to 28 months after injury...
November 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28661060/decreased-glutamate-levels-in-patients-with-amnestic-mild-cognitive-impairment-an-slaser-proton-mr-spectroscopy-and-pib-pet-study
#20
Burcu Zeydan, Dinesh K Deelchand, Nirubol Tosakulwong, Timothy G Lesnick, Orhun H Kantarci, Mary M Machulda, David S Knopman, Val J Lowe, Clifford R Jack, Ronald C Petersen, Gülin Öz, Kejal Kantarci
BACKGROUND AND PURPOSE: Glutamate levels may be informative about the declining neuronal health in the central nervous system. We used an advanced proton MR spectroscopy ((1) H-MRS) protocol composed of semi-localization by adiabatic selective refocusing (sLASER) localization and FAST(EST)MAP shimming for detection of alterations in brain glutamate concentrations in patients with amnestic mild cognitive impairment. METHODS: Participants with amnestic mild cognitive impairment (n = 14; median age = 80) and age- and sex-matched clinically normal controls (n = 32; median age = 79) from the population-based Mayo Clinic Study of Aging were recruited prospectively to the 3T single-voxel (1) H-MRS study that examined metabolite changes in the posterior cingulate gyri...
November 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
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