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Intracranial volume measurement

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https://www.readbyqxmd.com/read/29141045/csf-in-the-ventricles-of-the-brain-behaves-as-a-relay-medium-for-arteriovenous-pulse-wave-phase-coupling
#1
William E Butler, Pankaj K Agarwalla, Patrick Codd
The ventricles of the brain remain perhaps the largest anatomic structure in the human body without established primary purpose, even though their existence has been known at least since described by Aristotle. We hypothesize that the ventricles help match a stroke volume of arterial blood that arrives into the rigid cranium with an equivalent volume of ejected venous blood by spatially configuring cerebrospinal fluid (CSF) to act as a low viscosity relay medium for arteriovenous pulse wave (PW) phase coupling...
2017: PloS One
https://www.readbyqxmd.com/read/29139045/electroretinography-in-idiopathic-intracranial-hypertension-comparison-of-the-pattern-erg-and-the-photopic-negative-response
#2
Jason C Park, Heather E Moss, J Jason McAnany
PURPOSE: To evaluate the relationship between electrophysiological measures of retinal ganglion cell (RGC) function in patients who have idiopathic intracranial hypertension (IIH). METHODS: The pattern electroretinogram (pERG) and photopic negative response (PhNR) were recorded from 11 IIH patients and 11 age-similar controls. The pERG was elicited by a contrast-reversing checkerboard. The PhNR, a slow negative component following the flash ERG b-wave, was recorded in response to a long-wavelength flash presented against a short-wavelength adapting field...
November 14, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/29134925/effects-of-ssri-exposure-on-hemorrhagic-complications-and-outcome-following-thrombolysis-in-ischemic-stroke
#3
Schellen Christoph, Ferrari Julia, Lang Wilfried, Sykora Marek
Background Selective serotonin reuptake inhibitors (SSRI) may interfere with platelet function, and pre-stroke SSRI treatment has been associated with increased hematoma volumes and mortality in hemorrhagic stroke patients. The effects of SSRI on the risk of hemorrhagic complications after thrombolysis in ischemic stroke patients are unclear. Aims To examine the effects of pre-stroke SSRI exposure on bleeding complications, functional outcome, and mortality following thrombolysis in ischemic stroke. Methods Data including standard demographic and clinical variables as well as baseline and follow-up stroke severity (measured by National Institutes of Health Stroke Score), functional outcome (measured by modified Rankin Scale) at 3 months, and mortality at 7 and 90 days were extracted from the Virtual International Stroke Trials Archive...
January 1, 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/29132939/automated-brain-tissue-and-myelin-volumetry-based-on-quantitative-mr-imaging-with-various-in-plane-resolutions
#4
Christina Andica, Akifumi Hagiwara, Masaaki Hori, Misaki Nakazawa, Masami Goto, Saori Koshino, Koji Kamagata, Kanako K Kumamaru, Shigeki Aoki
BACKGROUND AND PURPOSE: Segmented brain tissue volume and myelin volume can now be automatically calculated using the SyMRI, which is based on quantification of R1 and R2 relaxation rates and proton density. The aim of this study was to determine the validity of SyMRI brain tissue and myelin volumetry using various in-plane resolutions. METHODS: We scanned 10 healthy subjects on a 1.5 T MR scanner with in-plane resolutions of 0.8, 2.0, and 3.0mm. Two scans were performed for each resolution...
November 10, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/29128167/a-prospective-evaluation-of-hippocampal-radiation-dose-volume-effects-and-memory-deficits-following-cranial-irradiation
#5
Ting Martin Ma, Jimm Grimm, Riley McIntyre, Heather Anderson-Keightly, Lawrence R Kleinberg, Russell K Hales, Joseph Moore, Tracy Vannorsdall, Kristin J Redmond
BACKGROUND AND PURPOSE: To prospectively evaluate hippocampal radiation dose volume effects and memory decline following cranial irradiation. MATERIAL AND METHODS: Effects of hippocampal radiation over a wide range of doses were investigated by combining data from three prospective studies. In one, adults with small cell lung cancer received hippocampal-avoidance prophylactic cranial irradiation. In the other two, adults with glioblastoma multiforme received neural progenitor cell sparing radiation or no sparing with extra dose delivered to subventricular zone...
November 8, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29115734/more-extensive-white-matter-hyperintensity-is-linked-with-higher-risk-of-remote-intracerebral-hemorrhage-after-intravenous-thrombolysis
#6
Yi Chen, Shenqiang Yan, Mengjun Xu, Genlong Zhong, David S Liebeskind, Min Lou
BACKGROUND AND PURPOSES: Remote intracerebral hemorrhage (rICH) is infrequent after intravenous thrombolysis (IVT) and its mechanism remains poorly understood. We aim to assess its frequency and possible relationship with the severity of white matter hyperintensity (WMH) in acute ischemic stroke (AIS) patients. METHODS: We prospectively analyzed data from consecutive AIS patients with MRI and IVT. WMH volume was quantitatively measured. rICH was defined as intracranial hemorrhage that appears in brain regions without visible ischemic changes on 24h follow-up imaging...
November 8, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29113947/diffusion-tensor-and-volumetric-magnetic-resonance-imaging-findings-in-the-brains-of-professional-musicians
#7
Niyazi Acer, Serap Bastepe-Gray, Ayse Sagiroglu, Kazim Z Gumus, Levent Degirmencioglu, Gokmen Zararsiz, Muhammet Usame Ozic
Professional musicians represent an ideal model to study the training-induced brain plasticity. The current study aimed to investigate the brain volume and diffusion characteristics of musicians using structural magnetic resonance and diffusion tensor imaging (DTI). The combined use of volumetric and diffusion methods in studying musician brain has not been done in literature. Our study group consisted of seven male musicians playing an instrument and seven age- and gender-matched non-musicians. We evaluated the volumes of gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF) and calculated total intracranial volume (TIV) and measured the fractional anisotropy (FA) of pre-selected WM bundles: corpus callosum (CC), corticospinal tract (CST), superior longitudinal fasciculus (SLF), forceps major (ForMaj), forceps minor (ForMin), and arcuate fasciculus (AF)...
November 4, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/29100859/safety-of-intravenous-thrombolysis-in-chronic-intracranial-hemorrhage-a-five-year-multicenter-study
#8
Ramin Zand, Georgios Tsivgoulis, Alireza Sadighi, Mantinderpreet Singh, Michael McCormack, Shima Shahjouei, Nitin Goyal, Nariman Noorbakhsh-Sabet, Anne W Alexandrov, Andrei V Alexandrov
INTRODUCTION: Although the recently updated U.S. alteplase label removed "history of intracranial hemorrhage (ICH)" as a contraindication, there are very limited data on the safety of intravenous thrombolysis (IVT) in acute ischemic stroke (AIS) patients with chronic ICH. We sought to evaluate IVT safety in AIS patients with a history of ICH. METHODS: We analyzed consecutive AIS patients treated with IVT at 3 tertiary stroke centers during a 5-year period. We identified AIS treated with IVT with clinical history and neuroimaging confirmation of prior ICH...
October 31, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29098570/intracranial-melanotic-schwannomas-a-rare-variant-with-unusual-adherent-features
#9
D Mahato, T Vivas-Buitrago, K Gassie, M Jentoft, D Tavanaiepour, A Quiñones-Hinojosa
Intracranial melanotic schwannomas (IMSch) are extremely rare nerve sheath tumors with features of Schwann cells that produce melanin. After a thorough review of the available literature since 1967, we report not only the 20th case of IMSch but a comprehensive modern-era analysis of radiographic and histological key-points to be considered when diagnosing and treating patients with this rare known entity. This is the case of a 43 years-old woman who presented with severe headaches 9 years ago (2008). At that time, MRI of the brain showed a 1...
November 2, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29077553/greater-body-mass-index-is-associated-with-reduced-frontal-cortical-volumes-among-adolescents-with-bipolar-disorder
#10
Alvi H Islam, Arron W S Metcalfe, Bradley J MacIntosh, Daphne J Korczak, Benjamin I Goldstein
BACKGROUND: Higher body mass index (BMI) and obesity is common among youth with bipolar disorder (BD) and is associated with greater psychiatric illness severity, including suicidality. Obesity has been associated with frontal, temporal and subcortical volumetric reductions in adults with BD. We examined the neurostructural correlates of BMI in adolescents early in their course of BD. METHODS: We processed T1-weighted images of adolescents with BD and psychiatrically healthy controls using FreeSurfer to derive a priori region of interest (ROI) volumes/cortical thickness for the frontal lobe (FL), prefrontal cortex (PFC) and orbitofrontal cortex (OFC) as well as volumes for the amygdala and hippocampus...
October 27, 2017: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/29066040/the-value-of-three-dimensional-photogrammetry-in-isolated-sagittal-synostosis-impact-of-age-and-surgical-technique-on-intracranial-volume-and-cephalic-index%C3%A2-a-retrospective-cohort-study
#11
Christian Mertens, Eline Wessel, Moritz Berger, Oliver Ristow, Jürgen Hoffmann, Katinka Kansy, Christian Freudlsperger, Heidrun Bächli, Michael Engel
PURPOSE: The aim of this study was to compare the outcome of intracranial volume (ICV) and cephalic index (CI) between two different techniques for surgical therapy of sagittal synostosis. MATERIAL AND METHODS: Between 2011 and 2015, all patients scheduled for surgical therapy of sagittal synostosis were consecutively enrolled. All patients younger than 6 months underwent early extended strip craniectomy (ESC group), and patients older than 6 months underwent late modified pi-procedure (MPP group)...
September 22, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29044753/development-of-a-quantitative-intracranial-vascular-features-extraction-tool-on-3d-mra-using-semiautomated-open-curve-active-contour-vessel-tracing
#12
Li Chen, Mahmud Mossa-Basha, Niranjan Balu, Gador Canton, Jie Sun, Kristi Pimentel, Thomas S Hatsukami, Jenq-Neng Hwang, Chun Yuan
PURPOSE: To develop a quantitative intracranial artery measurement technique to extract comprehensive artery features from time-of-flight MR angiography (MRA). METHODS: By semiautomatically tracing arteries based on an open-curve active contour model in a graphical user interface, 12 basic morphometric features and 16 basic intensity features for each artery were identified. Arteries were then classified as one of 24 types using prediction from a probability model...
October 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29034720/investigating-the-neuroanatomical-substrate-of-pathological-laughing-and-crying-in-amyotrophic-lateral-sclerosis-with-multimodal-neuroimaging-techniques
#13
Foteini Christidi, Efstratios Karavasilis, Panagiotis Ferentinos, Sophia Xirou, Georgios Velonakis, Michalis Rentzos, Vasiliki Zouvelou, Ioannis Zalonis, Efstathios Efstathopoulos, Nikolaos Kelekis, Ioannis Evdokimidis
OBJECTIVE: Pathological laughing and crying (PLC) is common in several neurological and psychiatric diseases and is associated with a distributed network involving the frontal cortex, the brainstem and cortico-pontine-cerebellar circuits. By applying multimodal neuroimaging approach, we examined the neuroanatomical substrate of PLC in a sample of patients with amyotrophic lateral sclerosis (ALS). METHODS: We studied 56 non-demented ALS patients and 25 healthy controls (HC)...
October 15, 2017: Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration
https://www.readbyqxmd.com/read/29032421/computer-based-radiological-longitudinal-evaluation-of-meningiomas-following-stereotactic-radiosurgery
#14
Eli Ben Shimol, Leo Joskowicz, Ruth Eliahou, Yigal Shoshan
PURPOSE: Stereotactic radiosurgery (SRS) is a common treatment for intracranial meningiomas. SRS is planned on a pre-therapy gadolinium-enhanced T1-weighted MRI scan (Gd-T1w MRI) in which the meningioma contours have been delineated. Post-SRS therapy serial Gd-T1w MRI scans are then acquired for longitudinal treatment evaluation. Accurate tumor volume change quantification is required for treatment efficacy evaluation and for treatment continuation. METHOD: We present a new algorithm for the automatic segmentation and volumetric assessment of meningioma in post-therapy Gd-T1w MRI scans...
October 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29032192/age-dependent-association-of-thyroid-function-with-brain-morphology-and-microstructural-organization-evidence-from-brain-imaging
#15
Layal Chaker, Lotte G M Cremers, Tim I M Korevaar, Marius de Groot, Abbas Dehghan, Oscar H Franco, Wiro J Niessen, M Arfan Ikram, Robin P Peeters, Meike W Vernooij
Thyroid hormone (TH) is crucial during neurodevelopment, but high levels of TH have been linked to neurodegenerative disorders. No data on the association of thyroid function with brain imaging in the general population are available. We therefore investigated the association of thyroid-stimulating hormone and free thyroxine (FT4) with magnetic resonance imaging (MRI)-derived total intracranial volume, brain tissue volumes, and diffusion tensor imaging measures of white matter microstructure in 4683 dementia- and stroke-free participants (mean age 60...
September 22, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28993810/computed-tomography-and-magnetic-resonance-imaging-are-equivalent-in-mensuration-and-similarly-inaccurate-in-grade-and-type-predictability-of-canine-intracranial-gliomas
#16
Krystina L Stadler, Jeffrey D Ruth, Theresa E Pancotto, Stephen R Werre, John H Rossmeisl
While magnetic resonance imaging (MRI) is the gold-standard imaging modality for diagnosis of intracranial neoplasia, computed tomography (CT) remains commonly used for diagnosis and therapeutic planning in veterinary medicine. Despite the routine use of both imaging modalities, comparison of CT and MRI has not been described in the canine patient. A retrospective study was performed to evaluate CT and MRI studies of 15 dogs with histologically confirmed glioma. Multiple lesion measurements were obtained, including two-dimensional and volumetric dimensions in pre-contrast and post-contrast images...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28993449/visit-to-visit-blood-pressure-variability-in-young-adulthood-and-hippocampal-volume-and-integrity-at-middle-age-the-cardia-study-coronary-artery-risk-development-in-young-adults
#17
Yuichiro Yano, Jared P Reis, Deborah A Levine, R Nick Bryan, Anthony J Viera, Daichi Shimbo, Yacob G Tedla, Norrina B Allen, Pamela J Schreiner, Michael P Bancks, Stephen Sidney, Mark J Pletcher, Kiang Liu, Philip Greenland, Donald M Lloyd-Jones, Lenore J Launer
The aims of this study are to assess the relationships of visit-to-visit blood pressure (BP) variability in young adulthood to hippocampal volume and integrity at middle age. We used data over 8 examinations spanning 25 years collected in the CARDIA study (Coronary Artery Risk Development in Young Adults) of black and white adults (age, 18-30 years) started in 1985 to 1986. Visit-to-visit BP variability was defined as by SDBP and average real variability (ARVBP, defined as the absolute differences of BP between successive BP measurements)...
December 2017: Hypertension
https://www.readbyqxmd.com/read/28993233/the-distribution-of-the-alpha7-nicotinic-acetylcholine-receptor-in-healthy-aging-an-in-vivo-positron-emission-tomography-study-with-18-f-asem
#18
Jennifer M Coughlin, Yong Du, Hailey B Rosenthal, Stephanie Slania, Soo Min Koo, Andrew Park, Ghedem Solomon, Melin Vranesic, Inga Antonsdottir, Caroline L Speck, Kelly Rootes-Murdy, Alexandria Lerner, Steven P Rowe, Yuchuan Wang, Wojciech G Lesniak, Il Minn, Arnold Bakker, Gwenn S Smith, Robert F Dannals, Hiroto Kuwabara, Andrew Horti, Dean F Wong, Martin G Pomper
Altered function of the alpha7 nicotinic acetylcholine receptor (α7-nAChR) is implicated in several neuropsychiatric diseases. Nevertheless, studies of the human cerebral α7-nAChR even in healthy aging are limited in number and to postmortem tissue. METHODS: The distribution of the cerebral α7-nAChR was estimated in nine brain regions in 25 healthy volunteers (ages 21-86 years; median 57 years, interquartile range 52 years) using [(18)F]ASEM with positron emission tomography (PET) imaging...
October 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28984590/disinhibition-in-alzheimer-s-disease-is%C3%A2-associated-with-reduced-right-frontal-pole-cortical-thickness
#19
Elizabeth Finger, Jing Zhang, Bradford Dickerson, Yves Bureau, Mario Masellis
Neuropsychiatric symptoms in Alzheimer's disease are among the most disabling and difficult aspects for caregivers and treating health professionals to manage. Despite the high prevalence of these behaviors, little is known about the factors which lead some patients to develop florid behavioral symptoms while others may progress to severe dementia without such phenomenon. We examined whether regional brain volumes as measured by cortical thickness would predict the presence or absence of disinhibition in patients with Alzheimer's disease...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28984516/multilevel-ultra-large-volume-epidural-blood-patch-for-the-treatment-of-neurocognitive-decline-associated-with-spontaneous-intracranial-hypotension-case-report
#20
Michael D Staudt, Stephen H Pasternak, Manas Sharma, Sachin K Pandey, Miguel F Arango, David M Pelz, Stephen P Lownie
Spontaneous intracranial hypotension (SIH) is a progressive clinical syndrome characterized by orthostatic headaches, nausea, emesis, and occasionally focal neurological deficits. Rarely, SIH is associated with neurocognitive changes. An epidural blood patch (EBP) is commonly used to treat SIH when conservative measures are inadequate, although some patients require multiple EBP procedures or do not respond at all. Recently, the use of a large-volume (LV) EBP has been described to treat occult leak sites in treatment-refractory SIH...
October 6, 2017: Journal of Neurosurgery
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