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Johansson Adam A Radiation Physics, Department of Radiation Sciences, Umeå University, Umeå SE-90187, - - 2014
Computed tomography (CT) substitute images can be generated from ultrashort echo time (UTE) MRI sequences with radial k-space sampling. These CT substitutes can be used as ordinary CT images for PET attenuation correction and radiotherapy dose calculations. Parallel imaging allows faster acquisition of magnetic resonance (MR) images by exploiting differences ...
Custer Philip L PL Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis, Missouri, - - 2014
Ophthalmologists are dependent on computed tomography (CT) and MRI to aid in the diagnosis and management of patients with orbital and visual conditions. Pitfalls in the imaging process can lead to inefficient care or patient harm. This review summarizes these problems and provides methods to reduce imaging errors. There has ...
de Margerie-Mellon Constance - - 2013
The extent of diffusion lesion on pretreatment imaging is a risk factor for poor outcome and hemorrhagic transformation after thrombolysis, and volumes of 70 to 100 mL have been advocated as cut-offs. However, estimating diffusion-weighted imaging (DWI) lesion volume (VolDWI) in the acute setting may be cumbersome. We aimed to ...
Johansson Adam - - 2013
Background. Estimation of computed tomography (CT) equivalent data, i.e. a substitute CT (s-CT), from magnetic resonance (MR) images is a prerequisite both for attenuation correction of positron emission tomography (PET) data acquired with a PET/MR scanner and for dose calculations in an MR-only radiotherapy workflow. It has previously been shown ...
Jonsson Joakim H - - 2013
The use of magnetic resonance imaging (MRI) as a complement to computed tomography (CT) in the target definition procedure for radiotherapy is increasing. To eliminate systematic uncertainties due to image registration, a workflow based entirely on MRI may be preferable. In the present pilot study, we investigate dose calculation accuracy ...
Boyer A C AC Department of Diagnostic Radiology, Oakland University William Beaumont School of Medicine, Rochester, MI 48073, USA. - - 2013
To evaluate the reproducibility of regional apparent diffusion coefficient (ADC) measurements of the normal fetal brain in the second and third trimesters of pregnancy. Fifty normal singleton fetuses from healthy pregnant women between 19 and 37 weeks' gestation were studied without sedation. Single-shot diffusion-weighted images of the fetal brain were ...
Gutzeit Andreas - - 2012
The aim of this study was to clarify whether addiction-specific neurometabolic reaction patterns occur in the insular cortex during acute nicotine withdrawal in tobacco smokers in comparison to nonsmokers. Fourteen male smokers and 10 male nonsmokers were included. Neurometabolites of the right and the left insular cortices were quantified by ...
Bhadauria H S HS Department of Electrical Engineering, Indian Institute of Technology, Roorkee, India. - - 2012
This paper presents an adaptive denoising approach aiming to improve the visibility and detectability of hemorrhage from brain computed tomography (CT) images. The suggested approach fuses the images denoised by total variation (TV) method, denoised by curvelet-based method, and edge information extracted from the noise residue of TV method. The ...
Mohammad Shaimaa Abdelsattar - - 2012
PURPOSE: To define the role of MRI in the preoperative assessment of patients with persistent cloaca and whether it can substitute other imaging modalities. METHODS: We prospectively examined eleven patients with persistent cloaca between July 2007 and March 2012. Non contrast MRI examinations were performed on 1.5T magnet using head ...
Nawas Mohammed T - - 2012
ABSTRACT: Cerebellar hypometabolism on FDG PET has been described in several conditions, for example, chronic alcohol abuse, antiepileptic medication use, multiple system atrophy, and cerebellar infarction. Corresponding cross-sectional examination is paramount in distinguishing possible etiologies because each condition has a relatively characteristic appearance. We present a case of an asymptomatic ...
Mertens Koen - - 2012
To determine the optimal timing for imaging brain tumours and other brain lesions with F-labelled fluoromethylcholine (F-FCho) PET. Dynamic PET imaging with F-FCho (acquisition time of 28 min) was performed in 24 patients with space-occupying lesions in the brain. On the coregistered PET and MRI, lesion-to-normal tissue uptake ratios (LNRs) ...
Kim Andrew Chae - - 2012
ABSTRACT: In the United States, approximately 1.7 million patients are treated annually for traumatic brain injury, and cerebrovascular insults are the third leading cause of death. Although CT plays a central role in the initial assessment of suspected intracranial injury, planar brain scintigraphy provides valuable information regarding cerebral perfusion, function, ...
Gregory Sarah S Forensic and Neurodevelopmental Sciences Department, Institute of Psychiatry, King's College London, England, - - 2012
The population of men who display persistent antisocial and violent behavior is heterogeneous. Callous-unemotional traits in childhood and psychopathic traits in adulthood characterize a distinct subgroup. To identify structural gray matter (GM) differences between persistent violent offenders who meet criteria for antisocial personality disorder and the syndrome of psychopathy (ASPDP) ...
Sun Xiumei - - 2012
The appearance of cognitive dysfunction after cardiac surgery in the absence of focal neurologic signs, a poorly understood but potentially devastating complication, almost certainly results from procedure-related brain injury. Confirmation of the occurrence of perioperative silent brain injury has been developed through advances in magnetic resonance imaging (MRI) techniques. These ...
Labate A - - 2012
BACKGROUND AND PURPOSE: Autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE) is a distinct epileptic syndrome with a broad range of severity even amongst affected members of the same pedigree, and the level of pharmacoresistance may reach 30%, close to that seen in sporadic focal epilepsies. METHODS: To investigate this issue ...
Johnson Brian - - 2012
Advanced neuroimaging techniques have shown promise in highlighting the subtle changes and nuances in mild traumatic brain injury (MTBI) even though clinical assessment has shown a return to pre-injury levels. Here we use ¹H-magnetic resonance spectroscopy (¹H-MRS) to evaluate the brain metabolites N-acetyl aspartate (NAA), choline (Cho), and creatine (Cr) ...
Moon Il Joon - - 2012
Although central nervous system abnormalities are incidentally detected in preoperative brain magnetic resonance imaging (MRI) studies in pediatric cochlear implant (CI) candidates, the clinical significance of the abnormalities remains unclear. We aimed to assess post-implantation auditory and speech performance in patients with brain lesions seen on MRI. Pediatric CI recipients ...
Hilschenz Ingo - - 2012
Within the magnetic resonance imaging (MRI) community the trend is going to higher and higher magnetic fields, ranging from 1.5 T to 7 T, corresponding to Larmor frequencies of 63.8-298 MHz. Since for high-field MRI the magnetization increases with the applied magnetic field, the signal-to-noise-ratio increases as well, thus enabling ...
Park Jaechan - - 2012
BACKGROUND: In ultra-early aneurysm surgery, the few hours from admission to aneurysm clipping present the greatest risk for an in-hospital recurrent hemorrhage, the development of acute hydrocephalus, and severe brain edema. Thus, severe brain swelling encountered after dural opening in a craniotomy can sometimes not be explained by a preoperative ...
Harrison Daniel M DM Department of Neurology, Johns Hopkins University, 600 North Wolfe Street, Pathology 622A, Baltimore, MD 21287, USA. - - 2013
Although diffusion tensor imaging (DTI) and the magnetization transfer ratio (MTR) have been extensively studied in multiple sclerosis (MS), it is still unclear if they are more effective biomarkers of disability than conventional MRI. MRI scans were performed on 117 participants with MS in addition to 26 healthy volunteers. Mean ...
Carducci Filippo - - 2012
In the search for a less expensive alternative to magnetic resonance imaging (MRI), which is contraindicated in some patients, we evaluated the accuracy of an individualized MR template-based head model in terms of navigated brain stimulation system targeting. The mean error between the identification of target points on individualized and ...
Kimura Yukio - - 2012
Static encephalopathy of childhood with neurodegeneration in adulthood (SENDA) is a recently established disorder that is a subtype of neurodegeneration with brain iron accumulation (NBIA). We presented the first case report of SENDA of a 39-year-old female. She had psychomotor retardation from childhood and remained static for two decades. Then, ...
José-López R - - 2012
Clinical signs and magnetic resonance imaging findings of multiple brain infarcts in two dogs infected with Leishmania spp. are reported. Clinical signs of intracranial dysfunction were peracute and there was no further deterioration. Magnetic resonance images of the brain were consistent with multifocal, non-haemorrhagic, ischaemic lesions. Routine serum biochemistry revealed ...
Stecco A - - 2012
PURPOSE: This study was undertaken to identify tumoural infiltration of peri-enhancing brain tissue in patients with glioblastoma by means of perfusion computed tomography (PCT) parameters, cerebral blood volume (CBV) and permeability surface (PS). MATERIALS AND METHODS: Eight patients with surgically treated glioblastoma who were eligible for radiotherapy and nine patients ...
Lanz Bernard - - 2012
The recent developments in high magnetic field (13) C magnetic resonance spectroscopy with improved localization and shimming techniques have led to important gains in sensitivity and spectral resolution of (13) C in vivo spectra in the rodent brain, enabling the separation of several (13) C isotopomers of glutamate and glutamine. ...
Lu Yu-Yu - - 2012
RATIONALE AND OBJECTIVES: Early detection of regional cerebral anomalies in acute carbon monoxide (CO) poisoning by (99m)Tc-hexamethylprophylene amine oxime (HMPAO) brain single photon emission computed tomography (SPECT) imaging has been reported previously. However, SPECT findings varied in these studies because of their small population sizes. In this study, we included ...
Pienaar Rudolph - - 2012
In patients presenting with cerebral ischemic injury, the outcome of injured brain tissue quantified as decreased apparent diffusion coefficient (ADC) may depend on associated alterations in cerebral blood perfusion (CBP). This study proposes a non-biased method to quantify associations between ADC and CBP in newborns with global or focal cerebral ...
Rosenbluth Kathryn H KH Department of Neurosurgery, University of California San Francisco, San Francisco, California, USA. - - 2012
To characterize the effects of pressure-driven brain infusions using high field intra-operative MRI. Understanding these effects is critical for upcoming neurodegeneration and oncology trials using convection-enhanced delivery (CED) to achieve large drug distributions with minimal off-target exposure. High-resolution T2-weighted and diffusion-tensor images were acquired serially on a 7 Tesla MRI ...
Cho Zang Hee ZH Neuroscience Research Institute, Gachon University of Medicine and Science, Incheon, Republic of Korea. - - 2013
Advances in the new-generation of ultra-high-resolution, brain-dedicated positron emission tomography-magnetic resonance imaging (PET/MRI) systems have begun to provide many interesting insights into the molecular dynamics of the brain. First, the finely delineated structural information from ultra-high-field MRI can help us to identify accurate landmark structures, thereby making it easier to ...
Magro Elsa - - 2012
INTRODUCTION: Diffusion tensor imaging and tractography allow studying white matter fiber bundles in the human brain in vivo. Electrophysiological studies and postmortem dissections permit improving our knowledge about the short association fibers connecting the pre- and postcentral gyri. The aim of this study was first to extract and analyze the ...
Neubauer Henning - - 2012
Diffusion-weighted MRI (DWI) is helpful for detection of brain abscess and pelvic abscess in adults. In the present study, we evaluated the diagnostic performance of DWI in children and young adults with abdominal and soft tissue abscess formations. Seventeen patients (11 females, aged 13 ± 6 years) with suspected abdominal ...
Abosch Aviva - - 2012
: Structural and functional MR images of the human brain acquired at 7 Tesla exhibit rich informational content with potential utility for clinical applications. However, (1) substantial increases in susceptibility artifact, and (2) the possibility of geometrical distortion at increased magnetic field strength, would be detrimental for stereotactic procedures such ...
Mertens Koen - - 2012
To evaluate the distribution of F-labelled fluoromethylcholine (FCho) in normal structures and tumors of the head region using positron emission tomography (PET) and magnetic resonance imaging. We retrospectively reviewed the positron emission tomography, magnetic resonance imaging, and the coregistered images obtained in 17 patients with suspected high-grade gliomas. The accumulation ...
Morrow Chris J - - 2012
Investigation of unexpected mortality in caged layer chickens led to the discovery of a consistent traumatic injury to the heads of affected hens. Initial post-mortem examination found linear skin lacerations and associated fractures in the dorsal cranium of all birds examined, and 5 to 10 mm deep trauma in the ...
Luther Neal - - 2012
: Standard magnetic resonance imaging (MRI) is normal following the vast majority of concussions. Diffusion tensor imaging (DTI) and susceptibility-weighted imaging (SWI) are advanced MRI techniques hypothesized to be more sensitive in detecting subtle evidence of structural brain injury. Using DTI and SWI in National Football League (NFL) players, we ...
Song Ming - - 2012
The functional brain network using blood-oxygen-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) has revealed the potentials for probing brain architecture, as well as for identifying clinical biomarkers for brain diseases. In the general context of Brainnetome, this review focuses on the development of approaches for modeling and analyzing functional brain ...
Büttner Andreas - - 2012
Cocaine abuse represents a significant health issue worldwide. Besides cardiovascular complications, psychiatric and neurologic symptoms are the most common manifestations of cocaine toxicity. In cocaine abusers brain abnormalities have been shown with computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), or single photon emission computed tomography (SPECT). ...
Zuo Nianming - - 2012
Increasing evidence shows that the human brain is a highly self-organized system that shows attributes of small-worldness, hierarchy and modularity. The "connectome" was conceived several years ago to identify the underpinning physical connectivities of brain networks. The need for an integration of multi-spatial and -temporal approaches is becoming apparent. Therefore, ...
Mulkey Sarah B - - 2012
The volume of acute injury detected by diffusion-weighted imaging and quantitative brain growth on serial cranial magnetic resonance imaging was not previously used to predict neurodevelopmental outcomes in infants with neonatal hypoxic-ischemic encephalopathy treated with head cooling. Our longitudinal study involved 16 head-cooled term infants with hypoxic-ischemic encephalopathy who underwent ...
Simpson Helen B HB Department of Psychiatry at Columbia University, College of Physicians and Surgeons, New York, NY 10032, USA. - - 2012
Glutamatergic abnormalities in corticostriatal brain circuits are thought to underlie obsessive-compulsive disorder (OCD). Whether these abnormalities exist in adults with OCD is not clear. We used proton magnetic resonance spectroscopy (¹H MRS) to test our hypothesis that unmedicated adults with OCD have reduced glutamate plus glutamine (Glx) levels in the ...
Fournier Neil M - - 2012
There has been increasing interest on the possible harmful effects of prenatal exposure to magnetic fields. To investigate the effect of weak intensity magnetic fields on the prenatal brain, pregnant Wistar rats were continuously exposed to one of four intensities (reference: 5-20nT; low 30-50nT; medium 90-580nT; high 590-1200nT) of a ...
van Norden Anouk G W - - 2012
The structural integrity of the cerebral white matter, including that of the white matter lesions (WML) and of the surrounding normal appearing white matter (NAWM), can be assessed with diffusion tensor imaging (DTI), which is suggested to be of added value in the explanation of cognitive dysfunction in cerebral small ...
Terada Yasuhiko - - 2012
MRI may be a noninvasive and alternative tool for skeletal age assessment in children, although few studies have reported on this topic. In this article, skeletal age was assessed over a wide range of ages using an open, compact MRI optimized for the imaging of a child's hand and wrist, ...
Lu Chao-Xuan CX Chao-Xuan Lu, Yong Du, Xiao-Xue Xu, Yang Li, Han-Feng Yang, Shao-Qiang Deng, Dong-Mei Xiao, Bing Li, Yun-Hong Tian, Sichuan Key Laboratory of Medical Imaging, Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, - - 2012
A 56-year-old man presented with a 6-mo history of headache. Although neurological and laboratory examinations were normal, computed tomography (CT) scan was performed which revealed multiple occipital osteolytic lesions, which were suspected to be multiple myeloma. Subsequently nuclear magnetic resonance imaging (MRI) showed that these lesions presented with a cerebrospinal ...
Harran Nathaniel X - - 2012
This article describes the MRI features of a middle ear cholesteatoma in an 8 yr old flat-coated retriever. Physical examination revealed pain on opening the jaw, and otoscopic examination showed tympanic membrane rupture associated with hyperplastic tissue at the entrance of the middle ear. Standard MRI sequences allowed for the ...
Brady Z - - 2012
To establish local diagnostic reference levels (LDRLs) at the Royal Children's Hospital (RCH) Melbourne, Parkville, Australia, for typical paediatric CT examinations and compare these with international diagnostic reference levels (DRLs) to benchmark local practice. In addition, the aim was to develop a method of analysing local scan parameters to enable ...
Prichep L - - 2012
Assessment of medical disorders is often aided by objective diagnostic tests which can lead to early intervention and appropriate treatment. In the case of brain dysfunction caused by head injury, there is an urgent need for quantitative evaluation methods to aid in acute triage of those subjects who have sustained ...
Prabhakaran Shyam - - 2012
Diffusion-weighted imaging (DWI) has revolutionized stroke diagnosis with its ability to detect small areas of brain ischemia within 30 minutes of onset.(1) Its application in ischemic stroke and TIA has provided insights into etiology and prognosis.(2) Following intracerebral hemorrhage (ICH), the occurrence of ischemia has been sought for decades, focused ...
Riba I - - 2012
Hypertension and silent cerebrovascular lesions (SCL) detected by brain magnetic resonance imaging (MRI) are associated with an increased risk of cognitive decline. In a prospective observational study in 1000 hypertensive patients, aged 50-70years, with no prior history of stroke or dementia, we will study the presence of mild cognitive impairment ...
D'Addario V - - 2012
Fetal cerebral ventriculomegaly (VM) is defined as an enlargement of the lateral ventricles of the developing fetal brain. It is diagnosed when the width of one or both lateral ventricles, measured at the level of the atrium, is ≥10 mm. VM is defined as mild when the atrial width is 10-15 mm ...
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