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volumetric mri

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https://www.readbyqxmd.com/read/28544575/analysis-of-physical-characteristics-of-tumor-treating-fields-for-human-glioblastoma
#1
Edwin Lok, Pyay San, Van Hua, Melissa Phung, Eric T Wong
Tumor Treating Fields (TTFields) therapy is an approved treatment that has known clinical efficacy against recurrent and newly diagnosed glioblastoma. However, the distribution of the electric fields and the corresponding pattern of energy deposition in the brain are poorly understood. To evaluate the physical parameters that may influence TTFields, postacquisition MP-RAGE, T1 and T2 MRI sequences from a responder with a right parietal glioblastoma were anatomically segmented and then solved using finite-element method to determine the distribution of the electric fields and rate of energy deposition at the gross tumor volume (GTV) and other intracranial structures...
May 23, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28543689/mild-cognitive-impairment-and-structural-brain-abnormalities-in-a-sexagenarian-with-a-history-of-childhood-traumatic-brain-injury
#2
John Darrell Van Horn, Andrei Irimia, Carinna M Torgerson, Avnish Bhattrai, Zachary Jacokes, Paul M Vespa
In this report, we present a case study involving an older, female patient with a history of pediatric traumatic brain injury (TBI). Magnetic resonance imaging and diffusion tensor imaging volumes were acquired from the volunteer in question, her brain volumetrics and morphometrics were extracted, and these were then systematically compared against corresponding metrics obtained from a large sample of older healthy control (HC) subjects as well as from subjects in various stages of mild cognitive impairment (MCI) and Alzheimer disease (AD)...
May 20, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28543178/volumetric-mri-analysis-in-patients-with-short-term-remission-of-cushing-s-disease
#3
Hong Jiang, Jie Ren, Na-Ying He, Chang Liu, Yu-Hao Sun, Fang-Fang Jian, Liu-Guan Bian, Jian-Kang Shen, Fu-Hua Yan, Si-Jan Pan, Qing-Fang Sun
OBJECTIVE: The data on patients with short-term remission of Cushing's disease (CD) might provide information that is not available from previous long-term remission studies. We aimed to investigate structural changes in the brain in these patients and to examine whether these changes were associated with clinical characteristics. DESIGN: A cross-sectional study was performed. METHODS: Thirty-four CD patients (14 with CD in short-term remission and 20 with active CD) and 34 controls matched for age, sex, and education underwent clinical evaluation and magnetic resonance imaging brain scans...
May 20, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28541819/model-of-disc-degeneration-in-rat-tail-induced-through-a-vascular-isolation-of-vertebral-endplates
#4
Héctor Fernández-Susavila, Juan Pablo Pardo-Seco, Ramón Iglesias-Rey, Tomás Sobrino, Francisco Campos, Máximo Alberto Díez-Ulloa
Back pain is a major health problem. The degenerative cascade of the spine begins in the intervertebral disc, due to an impairment in the blood supply through the vertebral endplates. Our objective was to develop a novel disc degeneration model based on these premises, akin to the process in humans, in contrast to other proposed models (puncture, enzyme injection, aberrant loads,…) Material and methods: 37 Sprague-Dawley rats, 2 arms: (a) histological (n = 17, one died), en- bloc sections, Van Gieson staining, (Nisimura-Mochida criteria) and also collagen VI staining (tissue oxidative stress), four animals were euthanized every 2 weeks (2-8); and (b) imaging (n = 20, six wound sloughs), MRI 9...
May 25, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28541487/tumor-progression-following-petroclival-meningioma-subtotal-resection-a-volumetric-study
#5
Jacob B Hunter, Brendan P O'Connell, Matthew L Carlson, Lola C Chambless, Robert J Yawn, Ray Wang, Akshitkumar Mistry, Reid C Thompson, Kyle D Weaver, George B Wanna
BACKGROUND: One study has investigated postoperative growth rates following subtotal resection of petroclival meningiomas utilizing linear measurements, which are insensitive to the multidimensional complex growth of meningiomas, to estimate tumor volume. OBJECTIVE: To describe petroclival meningioma growth patterns following less-than-complete resection utilizing volumetric analysis and to identify variables associated with tumor progression. METHODS: Patients with surgically resected WHO grade I petroclival meningiomas were retrospectively reviewed (1999-2015)...
May 24, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28538087/total-brain-and-hippocampal-volumes-and-cognition-in-older-american-indians-the-strong-heart-study
#6
Brenna Cholerton, Adam Omidpanah, Tara M Madhyastha, Thomas J Grabowski, Astrid M Suchy-Dicey, Dean K Shibata, Lonnie A Nelson, Steven P Verney, Barbara V Howard, William T Longstreth, Thomas J Montine, Dedra Buchwald
BACKGROUND: Estimates of hippocampal volume by magnetic resonance imaging have clinical and cognitive correlations and can assist in early Alzheimer disease diagnosis. However, little is known about the relationship between global or regional brain volumes and cognitive test performance in American Indians. MATERIALS AND METHODS: American Indian participants (N=698; median age, 72 y) recruited for the Cerebrovascular Disease and its Consequences in American Indians study, an ancillary study of the Strong Heart Study cohort, were enrolled...
April 2017: Alzheimer Disease and Associated Disorders
https://www.readbyqxmd.com/read/28535911/validation-of-a-free-software-for-unsupervised-assessment-of-abdominal-fat-in-mri
#7
Michele Maddalo, Ivan Zorza, Stefano Zubani, Giorgio Nocivelli, Giulio Calandra, Pierantonio Soldini, Lorella Mascaro, Roberto Maroldi
PURPOSE: To demonstrate the accuracy of an unsupervised (fully automated) software for fat segmentation in magnetic resonance imaging. The proposed software is a freeware solution developed in ImageJ that enables the quantification of metabolically different adipose tissues in large cohort studies. METHODS: The lumbar part of the abdomen (19cm in craniocaudal direction, centered in L3) of eleven healthy volunteers (age range: 21-46years, BMI range: 21.7-31.6kg/m(2)) was examined in a breath hold on expiration with a GE T1 Dixon sequence...
May 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28527004/comparative-volumetric-analysis-of-the-extent-of-resection-of-molecularly-and-histologically-distinct-low-grade-gliomas-and-its-role-on-survival
#8
Chikezie I Eseonu, Francisco Eguia, Karim ReFaey, Oscar Garcia, Fausto J Rodriguez, Kaisorn Chaichana, Alfredo Quinones-Hinojosa
The authors investigate the role of extent of resection (EOR) and genetic markers on patient outcome and survival for LGGs. We conducted a retrospective cohort between 2005 and 2015, of 109 adult patients who underwent surgery for a LGG by a single surgeon. Volumetric computations of MRI studies were conducted to evaluate the EOR, and genetic markers (IDH1, 1p/19q co-deletion, and p53) were assessed and their effects on survival and neurological outcome were evaluated. The median EOR was 88.1%. Permanent postoperative neurological deficits were seen in 4...
May 19, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28523471/quantification-of-left-atrial-volume-and-phasic-function-using-cardiovascular-magnetic-resonance-imaging-comparison-of-biplane-area-length-method-and-simpson-s-method
#9
Laura Kristin Wandelt, Johannes Tammo Kowallick, Andreas Schuster, Rolf Wachter, Thomas Stümpfig, Christina Unterberg-Buchwald, Michael Steinmetz, Christian Oliver Ritter, Joachim Lotz, Wieland Staab
Left atrial (LA) enlargement and dysfunction are markers of chronic diastolic dysfunction and an important predictor of adverse cardiovascular and cerebrovascular outcomes. Accordingly, accurate quantification of left atrial volume (LAV) and function is needed. In routine clinical cardiovascular magnetic resonance (CMR) imaging the biplane area-length method (Bi-ALM) is frequently applied due to time-saving image acquisition and analysis. However, given the varying anatomy of the LA we hypothesized that the diagnostic accuracy of the Bi-ALM is not sufficient and that results would be different from a precise volumetric assessment of transversal multi-slice cine images using Simpson's method...
May 18, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28520469/carotid-versus-coronary-atherosclerosis-burdens-in-acute-compared-with-chronic-symptomatic-coronary-artery-disease
#10
Stéphanie LeBlanc, Karine Bibeau, Olivier F Bertrand, Valérie Lévesque, Béatrice Deschênes St-Pierre, Philippe Pibarot, Jean-Pierre Després, Eric Larose
Prediction of coronary events remains elusive. Carotid atherosclerosis may be a surrogate for coronary risk, as carotid and coronary diseases occur simultaneously - albeit at times with a weak association - depending on clinical presentation. We investigated carotid and coronary atherosclerosis in men with new-onset unstable coronary artery disease (CAD) presenting with acute ST-segment elevation myocardial infarction (STEMI) vs. long-standing severe chronic stable angina (CSA). Bilateral carotid artery and 3-vessel coronary artery atherosclerosis burdens were measured within 1 month, respectively, by 3D-volumetric carotid magnetic resonance imaging and coronary angiography-derived modified CASS-50 score...
May 18, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28515546/use-of-jonkman-et-al-score-for-visual-quantification-of-electroencephalography-as-a-tool-to-assess-disease-severity-in-cortical-dementias
#11
R Kiran Kumar, Sadanandavalli Retnaswami Chandra, Girish B Kulkarni, Rose Dawn Bharath
OBJECTIVES: To study electroencephalography (EEG) changes in patients with cortical dementias (Alzheimer's disease [AD] and frontotemporal dementia (FTD). (1) To correlate EEG changes with clinical severity of dementia as assessed by rating scales. (2) To correlate global gray matter volume (GGMV) with EEG scores and clinical severity rating scales. PATIENTS AND METHODS: This is a prospective cross-sectional study involving patients fulfilling the criteria for Probable AD and FTD...
March 2017: Indian Journal of Psychological Medicine
https://www.readbyqxmd.com/read/28515392/assessment-of-left-ventricular-function-and-mass-on-free-breathing-compressed-sensing-real-time-cine-imaging
#12
Tomoyuki Kido, Teruhito Kido, Masashi Nakamura, Kouki Watanabe, Michaela Schmidt, Christoph Forman, Teruhito Mochizuki
BACKGROUND: Compressed sensing (CS) cine magnetic resonance imaging (MRI) has the advantage of being inherently insensitive to respiratory motion. This study compared the accuracy of free-breathing (FB) CS and breath-hold (BH) standard cine MRI for left ventricular (LV) volume assessment.Methods and Results:Sixty-three patients underwent cine MRI with both techniques. Both types of images were acquired in stacks of 8 short-axis slices (temporal/spatial resolution, 41 ms/1.7×1.7×6 mm(3)) and compared for ejection fraction, end-diastolic and systolic volumes, stroke volume, and LV mass...
May 18, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28512863/defining-a-multimodal-signature-of-remote-sports-concussions
#13
Sébastien Tremblay, Yasser Iturria-Medina, José María Mateos-Pérez, Alan C Evans, Louis De Beaumont
Sports-related concussions lead to persistent anomalies of the brain structure and function that interact with the effects of normal ageing. Although post-mortem investigations have proposed a bio-signature of remote concussions, there is still no clear in vivo signature. In the current study, we characterized white matter integrity in retired athletes with a history of remote concussions by conducting a full-brain, diffusion-based connectivity analysis. Next, we combined MRI diffusion markers with MR spectroscopic, MRI volumetric, neurobehavioral and genetic markers to identify a multidimensional in vivo signature of remote concussions...
May 16, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28505972/alzheimer-s-disease-associated-cerebrospinal-fluid-csf-biomarkers-do-not-correlate-with-csf-volumes-or-csf-production-rate
#14
Mikael Edsbagge, Ulf Andreasson, Khalid Ambarki, Carsten Wikkelsø, Anders Eklund, Kaj Blennow, Henrik Zetterberg, Mats Tullberg
BACKGROUND: Neuropathologically, Alzheimer's disease (AD) is characterized by accumulation of a 42 amino acid peptide called amyloid-β (Aβ42) in extracellular senile plaques together with intraneuronal inclusions of hyperphosphorylated tau protein in neurofibrillary tangles and neuronal degeneration. These changes are reflected in the cerebrospinal fluid (CSF), the volumes and production rates of which vary considerably between individuals, by reduced concentration of Aβ42, increased concentration of phosphorylated tau (P-tau) protein, and increased concentration of total tau (T-tau) protein, respectively...
May 8, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28505355/uncovering-the-neuroanatomical-correlates-of-cognitive-affective-and-conative-theory-of-mind-in-pediatric-traumatic-brain-injury-a-neural-systems-perspective
#15
Nicholas P Ryan, Cathy Catroppa, Richard Beare, Timothy J Silk, Stephen J Hearps, Miriam H Beauchamp, Keith Owen Yeates, Vicki A Anderson
Deficits in Theory of Mind (ToM) are common after neurological insult acquired in the first and second decade of life, however the contribution of large-scale neural networks to ToM deficits in children with brain injury is unclear. Using pediatric traumatic brain injury (TBI) as a model, this study investigated the sub-acute effect of brain injury on gray-matter volume of three large-scale, domain-general brain networks (the Default Mode Network, DMN; the Central Executive Network, CEN; and the Salience Network, SN), as well as two domain-specific neural networks implicated in social-affective processes (the Cerebro-Cerebellar Mentalizing Network, CCMN, and the Mirror Neuron/Empathy Network, MNEN)...
May 15, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28502846/domains-of-physical-activity-and-brain-volumes-a-population-based-study
#16
Carmen Jochem, Sebastian E Baumeister, Katharina Wittfeld, Michael F Leitzmann, Martin Bahls, Ulf Schminke, Marcello R P Markus, Stephan B Felix, Henry Völzke, Katrin Hegenscheid, Marcus Dörr, Hans Jörgen Grabe
Observational studies and intervention trials suggest that physical activity (PA) is beneficial for human brain morphology, especially in older individuals. Few population-based studies examined whether domain-specific PA is associated with brain volumes. Accordingly, we studied putative associations of PA during leisure time, sports and work with volumes of the hippocampus, the prefrontal cortex, the temporal lobe, gray matter (GM), white matter (WM) and total brain (TBV) after 5.9 years by applying volumetric analysis and voxel-based morphometry (VBM) with SPM 8/VBM 8 to brain magnetic resonance imaging data of 834 participants (447 women) aged 25 to 83 years from the population-based Study of Health in Pomerania...
May 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28502693/prolonged-blood-brain-barrier-disruption-following-laser-interstitial-ablation-in-epilepsy-a-case-series-with-a-case-report-of-post-ablation-optic-neuritis
#17
Saint-Aaron Morris, Matthew Rollo, Patrick Rollo, Jessica Johnson, Gerald A Grant, Elliott Friedman, Giridhar Kalamangalam, Nitin Tandon
OBJECTIVE: Laser interstitial thermal therapy (LITT) has become increasingly popular for targeting epileptic foci in a minimally invasive fashion. Despite its use in more than a thousand patients, the chronic effects of photo-thermal injury on brain physiology remain poorly understood. METHODS: We prospectively followed the clinical and radiographic courses of a cohort undergoing laser ablation for focal epilepsy. Only patients with non-enhancing lesions and those who had a delayed post-operative MRI with gadolinium administration approximately 6 months after the ablation were considered...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28501822/structural-mri-correlates-of-amyotrophic-lateral-sclerosis-progression
#18
Joe Senda, Naoki Atsuta, Hirohisa Watanabe, Epifanio Bagarinao, Kazunori Imai, Daichi Yokoi, Yuichi Riku, Michihito Masuda, Ryoichi Nakamura, Hazuki Watanabe, Mizuki Ito, Masahisa Katsuno, Shinji Naganawa, Gen Sobue
PURPOSE: Amyotrophic lateral sclerosis (ALS) presents with varying degrees of brain degeneration that can extend beyond the corticospinal tract (CST). Furthermore, the clinical course and progression of ALS varies widely. Brain degeneration detected using structural MRI could reflect disease progression. SUBJECTS AND METHODS: On study registration, 3-Tesla volumetric MRI and diffusion tensor imaging scans were obtained at baseline in 38 healthy controls and 67 patients with sporadic ALS...
May 13, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28499022/quantitative-imaging-biomarkers-for-risk-stratification-of-patients-with-recurrent-glioblastoma-treated-with-bevacizumab
#19
Patrick Grossmann, Vivek Narayan, Ken Chang, Rifaquat Rahman, Lauren Abrey, David A Reardon, Lawrence H Schwartz, Patrick Y Wen, Brian M Alexander, Raymond Huang, Hugo J W L Aerts
Background: Antiangiogenic therapy with bevacizumab is the most widely used treatment option for recurrent glioblastoma, but therapeutic response varies substantially and effective biomarkers for patient selection are not available. To this end, we determine whether novel quantitative radiomic strategies on the basis of magnetic-resonance-imaging (MRI) have the potential to noninvasively stratify survival and progression in this patient population. Methods: In an initial cohort of 126 patients, we identified a distinct set of features representative of the radiographic phenotype on baseline (pre-treatment) MRI...
May 11, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/28495945/role-of-high-resolution-dynamic-contrast-enhanced-mri-with-golden-angle-radial-sparse-parallel-reconstruction-to-identify-the-normal-pituitary-gland-in-patients-with-macroadenomas
#20
R Sen, C Sen, J Pack, K T Block, J G Golfinos, V Prabhu, F Boada, O Gonen, D Kondziolka, G Fatterpekar
BACKGROUND AND PURPOSE: Preoperative localization of the pituitary gland with imaging in patients with macroadenomas has been inadequately explored. The pituitary gland enhancing more avidly than a macroadenoma has been described in the literature. Taking advantage of this differential enhancement pattern, our aim was to evaluate the role of high-resolution dynamic MR imaging with golden-angle radial sparse parallel reconstruction in localizing the pituitary gland in patients undergoing trans-sphenoidal resection of a macroadenoma...
May 11, 2017: AJNR. American Journal of Neuroradiology
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