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Intracranial volume measurement

Ranliang Hu, John Holbrook, Nancy J Newman, Valerie Biousse, Beau B Bruce, Deqiang Qiu, John Oshinski, Amit M Saindane
BACKGROUND: Optic nerve sheath tortuosity is a previously reported, but incompletely characterized, finding in idiopathic intracranial hypertension (IIH). We hypothesized that optic nerve angle (ONA), as a quantitative measure of tortuosity, would change dynamically with cerebrospinal fluid (CSF) pressure status of patients with IIH immediately before and after lumbar puncture (LP). METHODS: Consecutive patients with suspected IIH referred for MRI and diagnostic LP were prospectively enrolled in this single institution, institutional review board-approved study...
March 16, 2018: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
Canan Koksal, Ugur Akbas, Nazmiye Donmez Kesen, Murat Okutan, Hatice Bilge, Gonul Kemikler
PURPOSE: The purpose of this study was to perform pretreatment patient-specific quality assurance (QA) for intracranial irradiation using CyberKnife with an ion chamber. METHODS: Twenty-five intracranial plans created using the ray-tracing algorithm were used for this study. Computed tomography (CT) images of the water-equivalent RW3 slab phantom with PinPoint ionization chamber were acquired with 1-mm slice thickness and transferred to the MultiPlan treatment planning system (TPS)...
January 2018: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
Dina Vojinovic, Sven J van der Lee, Cornelia M van Duijn, Meike W Vernooij, Maryam Kavousi, Najaf Amin, Ayşe Demirkan, M Arfan Ikram, Aad van der Lugt, Daniel Bos
BACKGROUND AND AIMS: Increasing evidence shows that intracranial carotid artery atherosclerosis may develop under the influence of a differential metabolic risk factor profile than atherosclerosis in the extracranial part of the carotid artery. To further elucidate these differences, we investigated associations of a wide range of circulating metabolites with intracranial and extracranial carotid artery atherosclerosis. METHODS: From the population-based Rotterdam Study, blood samples from 1111 participants were used to determine a wide range of metabolites by proton nuclear magnetic resonance (NMR)...
March 8, 2018: Atherosclerosis
Mårten Unnerbäck, Eric L Bloomfield, Sven Söderström, Peter Reinstrup
Current methods to measure cerebral blood flow (CBF) in the neuro critical care setting cannot monitor the CBF continuously. In contrast, continuous measurement of intracranial pressure (ICP) is readily accomplished, and there is a component of ICP that correlates with arterial inflow of blood into the cranial cavity. This property may have utility in using continuous ICP curve analysis to continuously estimate CBF. We examined the data from 13 patients, monitored with an intraventricular ICP device determining the pulsatile amplitude ICPamp as well as the area under the ICP curve (AUCICP )...
March 16, 2018: Journal of Clinical Monitoring and Computing
Ye Sel Kim, In Sung Park, Hyun Jung Kim, Dasom Kim, Nam Joon Lee, Im Joo Rhyu
OBJECTIVES: This study investigated whether there was any secular change in cranial vault morphology among Koreans born between the 1930s and 1970s, a period of dramatic shift in Korea's socioeconomic conditions. MATERIALS AND METHODS: Using three-dimensional MRI volumetry, we obtained the intracranial volume (ICV) and craniometric measurements of 115 healthy Koreans: 58 individuals (32 males and 26 females) born in the 1930s (1926-1936) and 57 (28 males and 29 females) born in the 1970s (1972-1979)...
March 15, 2018: American Journal of Physical Anthropology
Deirdre M O'Shea, Vonetta M Dotson, Adam J Woods, Eric C Porges, John B Williamson, Andrew O'Shea, Ronald Cohen
Objective: Research has shown that depression is a risk factor for Alzheimer's disease (AD) and subsequent cognitive decline. This is compounded by evidence showing an association between depression and reduced hippocampal volumes; a primary structure implicated in the pathogenesis of the disease. Less is known about the relationship between depression and other AD vulnerable regions such as the entorhinal cortex. Given the heterogeneity of depressive symptom presentation, we examined whether symptom dimensions were associated with hippocampal and entorhinal cortex volumes in community dwelling older adults...
2018: Frontiers in Aging Neuroscience
Anna Witkowska-Wrobel, Kirill Aristovich, Mayo Faulkner, James Avery, David Holder
Imaging ictal and interictal activity with Electrical Impedance Tomography (EIT) using intracranial electrode mats has been demonstrated in animal models of epilepsy. In human epilepsy subjects undergoing presurgical evaluation, depth electrodes are often preferred. The purpose of this work was to evaluate the feasibility of using EIT to localise epileptogenic areas with intracranial electrodes in humans. The accuracy of localisation of the ictal onset zone was evaluated in computer simulations using 9M element FEM models derived from three subjects...
February 27, 2018: NeuroImage
Abdullah Bin Zahid, David Balser, Rebekah Thomas, Margaret Y Mahan, Molly E Hubbard, Uzma Samadani
OBJECTIVE Chronic subdural hematoma (cSDH) is a highly morbid condition associated with brain atrophy in the elderly. It has a reported 30% 1-year mortality rate. Approximately half of afflicted individuals report either no or relatively unremarkable trauma preceding their diagnosis, raising the possibility that cSDH is a manifestation of degenerative or inflammatory disease rather than trauma. The purpose of this study was to compare the rates of cerebral atrophy before and after cSDH to determine whether it is more likely that cSDH causes atrophy or that atrophy causes cSDH...
March 2, 2018: Journal of Neurosurgery
A Lokossou, O Balédent, S Garnotel, G Page, L Balardy, Z Czosnyka, P Payoux, E A Schmidt
OBJECTIVE: The amplitude of intracranial pressure (ICP) can be measured by ICP monitoring. Phase-contrast magnetic resonance imaging (PCMRI) can quantify blood and cerebrospinal fluid (CSF) flows. The aim of this work was to investigate intracranial compliance at rest by combining baseline ICP monitoring and PCMRI in hydrocephalus patients. MATERIALS AND METHODS: ICP monitoring was performed before infusion testing to quantify ΔICP_rest at the basal condition in 33 suspected hydrocephalus patients (74 years)...
2018: Acta Neurochirurgica. Supplement
Cyrille Capel, Marc Baroncini, Catherine Gondry-Jouet, Roger Bouzerar, Marek Czosnyka, Zofia Czosnyka, Olivier Balédent
OBJECTIVES: Cerebrospinal fluid (CSF) and blood flows have a strong relationship during a cardiac cycle. Idiopathic intracranial hypertension (IIH) is a pathology that seems to present hemodynamic and hydrodynamic disturbance. The aim of this study was to establish CSF and blood interaction in IIH. MATERIAL AND METHODS: We retrospectively studied cerebral hydrodynamic and hemodynamic flows by phase-contrast MRI (PCMRI) in 13 IIH subjects (according Dandy's criteria) and 16 controls...
2018: Acta Neurochirurgica. Supplement
Noam Alperin, Ahmet M Bagci
OBJECTIVE: Most of the astronauts onboard the International Space Station (ISS) develop visual impairment and ocular structural changes that are not fully reversible upon return to earth. Current understanding assumes that the so-called visual impairments/intracranial pressure (VIIP) syndrome is caused by cephalad vascular fluid shift. This study assesses the roles of cerebrospinal fluid (CSF) and intracranial pressure (ICP) in VIIP. MATERIALS AND METHODS: Seventeen astronauts, 9 who flew a short-duration mission on the space shuttle (14...
2018: Acta Neurochirurgica. Supplement
Eric A Schmidt, Olivier Maarek, Jérôme Despres, Manon Verdier, Laurent Risser
Intracranial pressure (ICP) is a complex modality in the sense that it largely interconnects various systemic and intra-cranial variables such as cerebral blood flow and volume, cerebrospinal fluid flow and absoption, craniospinal container. In this context, although empirical correlation is an interesting tool for establishing relations between pairs of observed variables, it may be limited to establishing causation relations. For instance, if variables X and Y are mainly influenced by variable Z, their correlation is strong, but does not mean that X has a causation relation with Y or vice versa...
2018: Acta Neurochirurgica. Supplement
Sammy J Sharif, Cherith M Campbell-Bell, Diederik O Bulters, Robert J Marchbanks, Anthony A Birch
OBJECTIVES: Evoked tympanic membrane displacement (TMD) measurements, quantified by Vm , record small volume changes in the ear canal following stimulation of the acoustic reflex. Vm shows a correlation with intracranial pressure (ICP) and has been proposed as an option to non-invasively measure ICP. The spontaneous pulsing of the tympanic membrane, driven by the cardiovascular pulse, may contaminate the recordings and contribute to high measurement variability in some subjects. This study hypothesised that the larger the spontaneous vascular pulse, the larger the variability in Vm ...
2018: Acta Neurochirurgica. Supplement
Michael G Brandel, Cecilia L Dalle Ore, Chris M Reid, Wendy W Zhang, William Zhu, Chinwe S Kpaduwa, Samuel Lance, Hal S Meltzer, Amanda A Gosman
INTRODUCTION: Methods of reporting quantitative results for distraction osteogenesis (DO) of craniosynostosis have been inconsistent. Therefore, the efficacy of differing techniques and timing in regard to volume change is not well established, with no uniform metric for comparisons. Given that cranial vault remodeling with DO may be completed with different approaches, analysis was made to determine (1) the relative efficiency of different approaches in expanding intracranial volume (ICV) and (2) the impact of adjusting for ICV growth on measured DO efficiency...
February 27, 2018: Annals of Plastic Surgery
Ali Fatemi, Somayeh Taghizadeh, Claus Chunli Yang, Madhava R Kanakamedala, Bart Morris, Srinivasan Vijayakumar
Purpose Magnetic resonance (MR) images are necessary for accurate contouring of intracranial targets, determination of gross target volume and evaluation of organs at risk during stereotactic radiosurgery (SRS) treatment planning procedures. Many centers use magnetic resonance imaging (MRI) simulators or regular diagnostic MRI machines for SRS treatment planning; while both types of machine require two stages of quality control (QC), both machine- and patient-specific, before use for SRS, no accepted guidelines for such QC currently exist...
December 18, 2017: Curēus
Devasuda Anblagan, Maria C Valdés Hernández, Stuart J Ritchie, Benjamin S Aribisala, Natalie A Royle, Iona F Hamilton, Simon R Cox, Alan J Gow, Alison Pattie, Janie Corley, John M Starr, Susana Muñoz Maniega, Mark E Bastin, Ian J Deary, Joanna M Wardlaw
Introduction: The hippocampus plays an important role in cognitive abilities which often decline with advancing age. Methods: In a longitudinal study of community-dwelling adults, we investigated whether there were coupled changes in hippocampal structure and verbal memory, working memory, and processing speed between the ages of 73 ( N  = 655) and 76 years ( N  = 469). Hippocampal structure was indexed by hippocampal volume, hippocampal volume as a percentage of intracranial volume (H_ICV), fractional anisotropy (FA), mean diffusivity (MD), and longitudinal relaxation time (T1)...
February 2018: Brain and Behavior
Ruggero Bevilacqua, Peter Tarnow, Lars Kölby, Giovanni Maltese
Multisutural nonsyndromic craniosynostosis is a rare group of malformations, whose frequency has been reported between 3% and 7% of all craniosynostosis. The clinical diagnosis can be difficult and computed tomography is usually required. Surgical treatment is challenging and staged procedures are performed in up to 80% of patients. The aim of the present study was to determine the reoperation rate and to evaluate the surgical outcomes by measuring intracranial volume (ICV) preoperatively and at follow-up, and comparing it to a control group...
February 23, 2018: Journal of Craniofacial Surgery
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 T 1 -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...
March 2018: Journal of Psychiatry & Neuroscience: JPN
R Kleinloog, J J M Zwanenburg, B Schermers, E Krikken, Y M Ruigrok, P R Luijten, F Visser, L Regli, G J E Rinkel, B H Verweij
BACKGROUND AND PURPOSE: Aneurysm volume pulsation is a potential predictor of intracranial aneurysm rupture. We evaluated whether 7T MR imaging can quantify aneurysm volume pulsation. MATERIALS AND METHODS: In Stage I of the study, 10 unruptured aneurysms in 9 patients were studied using a high-resolution (0.6-mm, isotropic) 3D gradient-echo sequence with cardiac gating. Semiautomatic segmentation was used to measure aneurysm volume (in cubic millimeters) per cardiac phase...
February 22, 2018: AJNR. American Journal of Neuroradiology
Xiaoyan Shang, Michelle C Carlson, Xiaoying Tang
Total intracranial volume (TIV) is often used as a measure of brain size to correct for individual variability in magnetic resonance imaging (MRI) based morphometric studies. An adjustment of TIV can greatly increase the statistical power of brain morphometry methods. As such, an accurate and precise TIV estimation is of great importance in MRI studies. In this paper, we compared three automated TIV estimation methods (multi-atlas likelihood fusion (MALF), Statistical Parametric Mapping 8 (SPM8) and FreeSurfer (FS)) using longitudinal T1-weighted MR images in a cohort of 70 older participants at elevated sociodemographic risk for Alzheimer's disease...
February 11, 2018: Psychiatry Research
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