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Intracranial volume measurement

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https://www.readbyqxmd.com/read/28339918/can-clinically-relevant-dose-errors-in-patient-anatomy-be-detected-by-gamma-passing-rate-or-modulation-complexity-score-in-volumetric-modulated-arc-therapy-for-intracranial-tumors
#1
Shingo Ohira, Yoshihiro Ueda, Masaru Isono, Akira Masaoka, Misaki Hashimoto, Masayoshi Miyazaki, Masaaki Takashina, Masahiko Koizumi, Teruki Teshima
We investigated whether methods conventionally used to evaluate patient-specific QA in volumetric-modulated arc therapy (VMAT) for intracranial tumors detect clinically relevant dosimetric errors. VMAT plans with coplanar arcs were designed for 37 intracranial tumors. Dosimetric accuracy was validated by using a 3D array detector. Dose deviations between the measured and planned doses were evaluated by gamma analysis. In addition, modulation complexity score for VMAT (MCSv) for each plan was calculated. Three-dimensional dose distributions in patient anatomy were reconstructed using 3DVH software, and clinical deviations in dosimetric parameters between the 3DVH doses and planned doses were calculated...
March 3, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28327974/intracranial-aneurysm-parameters-for-predicting-a-future-subarachnoid-hemorrhage-a-long-term-follow-up-study
#2
Seppo Juvela, Miikka Korja
BACKGROUND: Retrospective studies have suggested that aneurysm morphology is a risk factor for subarachnoid hemorrhage (SAH). OBJECTIVE: To investigate whether various morphological indices of unruptured intracranial aneurysms (UIAs) predict a future rupture. METHODS: A total of 142 patients with UIAs diagnosed between 1956 and 1978 were followed prospectively until SAH, death, or the last contact. Morphological UIA indices from standard angiographic projections were measured at baseline and adjusted in multivariable Cox proportional hazards regression analyses for established risk factors for SAH...
January 10, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28319953/dual-versus-single-energy-ct-angiography-imaging-for-patients-undergoing-intracranial-aneurysm-repair
#3
Amr Abdulazim, Christian Rubbert, Dorothea Reichelt, Christian Mathys, Bernd Turowski, Hans-Jakob Steiger, Daniel Hänggi, Nima Etminan
BACKGROUND: The invasiveness and risk of thromboembolic complications of catheter angiography underline the need for alternative imaging modalities in patients following intracranial aneurysm (IA) repair. However, the overall image quality of existing noninvasive imaging modalities, such as single-energy CT angiography (SE-CTA), compromises its value in this respect. OBJECTIVE: We prospectively investigated the value of a novel dual-energy CTA (DE-CTA) scanner and algorithm for assessing the degree of occlusion and parent vessel patency in patients following IA repair...
March 21, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/28298015/toward-the-complete-control-of-brain-metastases-using-surveillance-screening-and-stereotactic-radiosurgery
#4
Amparo Wolf, Svetlana Kvint, Abraham Chachoua, Anna Pavlick, Melissa Wilson, Bernadine Donahue, John G Golfinos, Joshua Silverman, Douglas Kondziolka
OBJECTIVE The incidence of brain metastases is increasing with improved systemic therapies, many of which have a limited impact on intracranial disease. Stereotactic radiosurgery (SRS) is a first-line management option for brain metastases. The purpose of this study was to determine if there is a threshold tumor size below which local control (LC) rates approach 100%, and to relate these findings to the use of routine surveillance brain imaging. METHODS From a prospective registry, 200 patients with 1237 brain metastases were identified who underwent SRS between December 2012 and May 2015...
February 17, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28298013/does-subjective-improvement-in-adults-with-intracranial-arachnoid-cysts-justify-surgical-treatment
#5
Katrin Rabiei, Per Hellström, Mats Högfeldt-Johansson, Magnus Tisell
OBJECTIVE Subjective improvement of patients who have undergone surgery for intracranial arachnoid cysts has justified surgical treatment. The current study aimed to evaluate the outcome of surgical treatment for arachnoid cysts using standardized interviews and assessments of neuropsychological function and balance. The relationship between arachnoid cyst location, postoperative improvement, and arachnoid cyst volume was also examined. METHODS The authors performed a prospective, population-based study. One hundred nine patients underwent neurological, neuropsychological, and physiotherapeutic examinations...
February 17, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28283592/physical-activity-and-hippocampal-volume-in-middle-aged-patients-with-type-1-diabetes
#6
Karen A Nunley, Regina L Leckie, Trevor J Orchard, Tina Costacou, Howard J Aizenstein, J Richard Jennings, Kirk I Erickson, Caterina Rosano
OBJECTIVE: To examine the cross-sectional association between physical activity (PA) and hippocampal volume in middle-aged adults with childhood-onset type 1 diabetes (T1D), and whether hyperglycemia and insulin sensitivity contribute to this relationship. METHODS: We analyzed neuroimaging and self-reported PA data from 79 adults with T1D from the Pittsburgh Epidemiology of Diabetes Complications Study (mean age 50 years, mean duration 41 years) and 122 similarly aged adults without T1D (mean age 48 years)...
March 10, 2017: Neurology
https://www.readbyqxmd.com/read/28279553/portable-near-infrared-rapid-detection-of-intracranial-hemorrhage-in-chinese-population
#7
Long Xu, Xiaogang Tao, Weiming Liu, Yanong Li, Jun Ma, Te Lu, Bo Han, Baiyun Liu, Yuanli Zhao, Jingsheng Li, Jizong Zhao
BACKGROUND: Secondary brain injury is the main cause of mortality from traumatic brain injury (TBI). One hallmark of TBI is intracranial hemorrhage, which occurs in 40-50% of severe TBI cases. Early identification of intracranial hematomas in TBI patients allows early surgical evacuation, and can reduce the case-fatality rate of TBI. Since pre-hospital care is the weakest part of Chinese emergency care, there is an urgent need for a capability to detect brain hematomas early. The purpose of this observational study was to evaluate the performance of a near infrared (NIR) based, device to screen for traumatic intracranial hematomas in Chinese population...
March 6, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28271290/arterial-spin-labelling-detects-posterior-cortical-hypoperfusion-in-non-demented-patients-with-parkinson-s-disease
#8
Zoe Joanna Syrimi, Lubomir Vojtisek, Ilona Eliasova, Jana Viskova, Alena Svatkova, Jiri Vanicek, Irena Rektorova
While previous studies suggested that perfusion abnormalities in Parkinson's disease (PD) are driven by dementia, our study aimed to identify perfusion underpinning of cognitive alteration in non-demented PD patients. Cerebral blood flow was measured using arterial spin labelling (ASL) in 28 PD patients (age 65 years ± 9.9 SD) and 16 age-matched healthy controls (HC) (age 65 years ± 7.8 SD), who also underwent neurological and cognitive testing. The 3D pseudocontinuous ASL and T2-weighted scans from 22 PD patients and 16 HC were analysed in a voxel-wise manner using SPM8 software...
March 7, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28263930/contralateral-hemispheric-brain-atrophy-after-primary-intracerebral-hemorrhage
#9
Ju-Hwi Kim, You-Sub Kim, Sung-Hyun Kim, Sang-Deok Kim, Jae-Young Park, Tae-Sun Kim, Sung-Pil Joo
OBJECTIVE: In patients with intracerebral hematoma (ICH), it is well known that brain atrophy occurs in the hemisphere ipsilateral to the hematoma. The present study aimed to investigate contralateral hemispheric volume changes in patients with ICH as well as related factors. METHODS: Of 112 patients with ICH who were surgically treated at our hospital between January 2011 and December 2015, 44 were included in the present study. We measured contralateral hemispheric brain areas in three different planes of axial brain computed tomography (CT) images...
March 2, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28262513/analysis-of-the-cephalometric-changes-in-the-first-3-months-after-spring-assisted-cranioplasty-for-scaphocephaly
#10
O Ou Yang, D D Marucci, R J Gates, M Rahman, J Hunt, M P Gianoutsos, W R Walsh
BACKGROUND: Spring-assisted cranioplasty (SAC) has become an accepted treatment for patients with sagittal craniosynostosis; however, the early effects of springs on skull dimensions have never been assessed with objective measurements in the literature. The present study evaluated the changes in skull dimensions and intracranial volume (ICV) during the first 3 months after SAC for sagittal synostosis. METHODS: Sixteen patients with sagittal synostosis underwent SAC...
January 9, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28259877/findings-of-vascular-brain-injury-and-structural-loss-from-cranial-magnetic-resonance-imaging-in-elderly-american-indians-the-strong-heart-study
#11
Astrid M Suchy-Dicey, Dean K Shibata, Tara M Madhyastha, Thomas J Grabowski, W T Longstreth, Dedra S Buchwald
BACKGROUND: The Cerebrovascular Disease and its Consequences in American Indians study conducted cranial MRI examination of surviving participants of the Strong Heart Study, a longitudinal cohort of elderly American Indians. METHODS: Of the 1,033 recruited participants, some were unable to complete the MRI (n = 22), some scans were unusable due to participant motion or technical errors (n = 13), and one community withdrew consent after data collection (n = 209), leaving 789 interpretable MRI scan images...
March 4, 2017: Neuroepidemiology
https://www.readbyqxmd.com/read/28258787/cerebrovascular-reactivity-and-intellectual-outcome-in-childhood-stroke-with-transient-cerebral-arteriopathy
#12
Nomazulu Dlamini, Ivanna Yau, Robyn Westmacott, Manohar Shroff, Derek Armstrong, William Logan, David Mikulis, Gabrielle deVeber, Andrea Kassner
BACKGROUND: Hypercapnic-challenge blood oxygen level-dependent magnetic resonance imaging cerebrovascular reactivity (CVR), measures the regional perfusion response to altered carbon dioxide. CVR correlates with the tissue-level microvascular dysfunction and ischemic risk. Among children with arterial ischemic stroke, transient cerebral arteriopathy (TCA) is a frequent, nonprogressive unilateral intracranial arteriopathy, which typically results in basal ganglia infarction and chronic cerebral artery stenosis...
January 7, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28244335/linear-relationship-found-by-magnetic-resonance-imaging-between-cerebrospinal-fluid-volume-and-body-weight-in-dogs
#13
László Z Reinitz, Gábor Bajzik, Rita Garamvölgyi, Bianka Benedek, Örs Petneházy, András Lassó, Zsolt Abonyi-Tóth, Borbála Lőrincz, Péter Sótonyi
Despite numerous studies on cerebrospinal fluid (CSF) and its importance during hydrocephalus or myelography, no reliable values exist about its overall volume in dogs. In this study, our aim was to measure the intracranial (IC) volume of CSF in dogs and assess its possible relationship with body size and the symmetry of the lateral ventricles. We ran a 3D magnetic resonance imaging (MRI) sequence on the central nervous system of 12 healthy, male mongrel dogs between 3-5 years of age and 7.5-35.0 kg body weight...
March 2017: Acta Veterinaria Hungarica
https://www.readbyqxmd.com/read/28244132/3d-phase-contrast-mri-partial-volume-correction-for-robust-blood-flow-quantification-in-small-intracranial-vessels
#14
Pierre Bouillot, Bénédicte M A Delattre, Olivier Brina, Rafik Ouared, Mohamed Farhat, Christophe Chnafa, David A Steinman, Karl-Olof Lovblad, Vitor M Pereira, Maria I Vargas
PURPOSE: Recent advances in 3D-PCMRI (phase contrast MRI) sequences allow for measuring the complex hemodynamics in cerebral arteries. However, the small size of these vessels vs spatial resolution can lead to non-negligible partial volume artifacts, which must be taken into account when computing blood flow rates. For this purpose, we combined the velocity information provided by 3D-PCMRI with vessel geometry measured with 3DTOF (time of flight MRI) or 3DRA (3D rotational angiography) to correct the partial volume effects in flow rate assessments...
February 28, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28241107/technical-note-development-of-a-cranial-phantom-for-assessing-perfusion-diffusion-and-biomechanics
#15
Naoki Ohno, Tosiaki Miyati, Tomohiro Chigusa, Hikari Usui, Shota Ishida, Yuki Hiramatsu, Satoshi Kobayashi, Toshifumi Gabata, Noam Alperin
PURPOSE: A novel cranial phantom was developed to simulate the relationships among factors such as blood perfusion, water diffusion, and biomechanics in intracranial tissue. METHODS: The cranial phantom consisted of a high-density polypropylene filter (mimicking brain parenchyma) with intra- and extra-filter spaces (mimicking cerebral artery and vein, respectively), and a capacitor space (mimicking the cerebrospinal fluid space). Pulsatile and steady flow with different flow rates were applied to the cranial phantom using a programmable pump...
February 27, 2017: Medical Physics
https://www.readbyqxmd.com/read/28216398/engaging-in-a-keyhole-concept-for-the-management-of-ruptured-and-unruptured-aneurysms
#16
Daniel D Cavalcanti, Roberto C de Paula, Paula L Alvarenga, Paulo José P da Mata, Paulo Niemeyer Filho
OBJECTIVE: Many new endovascular devices have been used under the guidance of the International Subarachnoid Aneurysm Trial (ISAT). Clipping still offers higher occlusion rates, and its technique continues to evolve, resulting in smaller exposures and reduced manipulation to brain tissue. We sought to evaluate the routine use of the minisphenoidal approach to manage intracranial aneurysms in a high-volume institution. METHODS: We retrospectively reviewed our database of aneurysm patients from October 2013 to May 2016...
February 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28209450/the-effect-of-tranexamic-acid-in-traumatic-brain-injury-a-randomized-controlled-trial
#17
Abolfazl Jokar, Koorosh Ahmadi, Tayyebeh Salehi, Mahdi Sharif-Alhoseini, Vafa Rahimi-Movaghar
PURPOSE: Traumatic brain injury (TBI) is a leading cause of death and disability. Intracranial hemorrhage (ICH) secondary to TBI is associated with a high risk of coagulopathy which leads to increasing risk of hemorrhage growth and higher mortality rate. Therefore, antifibrinolytic agents such as tranexamic acid (TA) might reduce traumatic ICH. The aim of the present study was to investigate the extent of ICH growth after TA administration in TBI patients. METHODS: This single-blind randomized controlled trial was conducted on patients with traumatic ICH (with less than 30 ml) referring to the emergency department of Vali-Asr Hospital, Arak, Iran in 2014...
February 2017: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/28199398/a-segmentation-based-volumetric-approach-to-localize-and-quantify-cerebral-vasospasm-based-on-tomographic-imaging-data
#18
Axel Neulen, Tobias Pantel, Michael Kosterhon, Stefanie Kirschner, Marc A Brockmann, Sven R Kantelhardt, Alf Giese, Serge C Thal
INTRODUCTION: Quantification of cerebral vasospasm after subarachnoid hemorrhage (SAH) is crucial in animal studies as well as clinical routine. We have developed a method for computer-based volumetric assessment of intracranial blood vessels from cross-sectional imaging data. Here we demonstrate the quantification of vasospasm from micro computed tomography (micro-CT) data in a rodent SAH model and the transferability of the volumetric approach to clinical data. METHODS: We obtained rodent data by performing an ex vivo micro-CT of murine brains after sham surgery or SAH by endovascular filament perforation on day 3 post hemorrhage...
2017: PloS One
https://www.readbyqxmd.com/read/28187815/principles-of-intracranial-pressure-monitoring-and-treatment
#19
REVIEW
M Czosnyka, J D Pickard, L A Steiner
Intracranial pressure (ICP) is governed by volumes of intracranial blood, cerebrospinal fluid, and brain tissue. Expansion of any of these volumes will trigger compensatory changes in the other compartments, resulting in initially limited change in ICP. Due to the rigid skull, once compensatory mechanisms are exhausted, ICP rises very rapidly. Intracranial hypertension is associated with unfavorable outcome in brain-injured patients. This chapter discusses the pathophysiology of raised ICP, as well as typical waveforms, monitoring techniques, and clinical management...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28183829/retinal-structure-assessed-by-oct-as-a-biomarker-of-brain-development-in-children-born-small-for-gestational-age
#20
Victoria Pueyo, Teresa Pérez, Inmaculada González, Irene Altemir, Galadriel Gimenez, Esther Prieto, Cristina Paules, Daniel Oros, Javier Lopez-Pison, Nicolás Fayed, Gracián Garcia-Martí, Roberto Sanz-Requena, Miguel Angel Marin
PURPOSE: To identify differences in neuronal tissue from retinal and brain structures in children born small for gestational age (SGA) with no abnormality in neonatal brain ultrasonography and no previous neurological impairment, and to evaluate the relationship between retinal structure and brain changes in school-age children born SGA. METHODS: Two cohorts of children were recruited: 25 children born SGA and 25 children born with an appropriate birth weight according to gestational age...
February 9, 2017: British Journal of Ophthalmology
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