Abstract：
:The strength duration relationship for peripheral nerve stimulation by MR imaging pulsed gradient magnetic fields was measured in 84 human subjects. The data were fitted to the hyperbolic strength-duration relationship: dB/dt=b(1 + c/d), where b is rheobase, c is chronaxie, and d is duration, and dB/dt is reported as the maximal value on the axis of the bore. For sensation threshold, average (b,c) (15 T/s, 0.37 ms) for the y-gradient and (26 T/s, 0.38 ms) for the z-gradient coil. The dB/dt intensity to induce a sensation which the subject described as uncomfortable was about 50% above the sensation threshold. Experiments with dogs showed that the cardiac stimulation by pulsed magnetic gradient fields is exceedingly unlikely.
journal_name
Neuroimaging Clin N Amjournal_title
Neuroimaging clinics of North Americaauthors
Bourland JD,Nyenhuis JA,Schaefer DJkeywords:
subject
Has Abstractpub_date
1999-05-01 00:00:00pages
363-77issue
2eissn
1052-5149issn
1557-9867journal_volume
9pub_type
杂志文章abstract：:Cryotherapy of the brain is an old and well-established technique of functional and resective neurosurgery. With the use of modern imaging techniques such as MR imaging, which is ideally suited for diagnosis, planning, and monitoring of an ablation procedure, cryotherapy can become a modern alternative to other ablati...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：
更新日期：2001-11-01 00:00:00
abstract：:Neuromyelitis optica (NMO) is a severe inflammatory demyelinating disorder typically characterized by attacks of recurrent optic neuritis and transverse myelitis. Advances in magnetic resonance imaging techniques and the discovery of the relatively specific NMO IgG biomarker have led to improved diagnostic accuracy an...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2012.12.007
更新日期：2013-05-01 00:00:00
abstract：:Most articles in 1995 demonstrated a sensitivity of 100% and specificities of 90% to 98% in detecting carotid bifurcation stenosis using a combination of MR angiography and ultrasonography, reserving conventional angiography for cases of disparate stenosis with the noninvasive studies. Multiple reviews concluded that ...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：
更新日期：1996-11-01 00:00:00
abstract：:Acute disseminated encephalomyelitis (ADEM) is a monophasic demyelinating disease of the central nervous system typically affecting the gray and the white matter of the brain and spinal cord in multiple locations. In the acute stages, ADEM is characterized histologically by perivenous edema, demyelination, and infiltr...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2007.12.007
更新日期：2008-02-01 00:00:00
abstract：:Evaluation of imaging studies of the cerebellum in inherited neurodegenerative disorders is aided by attention to neuroimaging patterns based on anatomic determinants, including biometric analysis, hyperintense signal of structures, including the cerebellar cortex, white matter, dentate nuclei, brainstem tracts, and n...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2016.03.007
更新日期：2016-08-01 00:00:00
abstract：:Imaging evaluation of the postoperative orbit remains challenging even for the expert neuroradiologist. This article provides a simplified framework for understanding the complex postoperative appearances of the orbit, in an attempt to enhance the diagnostic accuracy of postoperative computed tomography and MR imaging...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2015.05.008
更新日期：2015-08-01 00:00:00
abstract：:Classical descriptions of the temporal bone are based on its five embryologically distinct osseous components: the petrous, tympanic, mastoid, squamous, and styloid portions. ...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章
doi：10.1016/j.nic.2004.07.008
更新日期：2004-11-01 00:00:00
abstract：:For over 20 years, conventional MR imaging has been used for assessing brain tumors. However, conventional MR imaging tends to underestimate the extent of the tumor, perhaps leading to suboptimal treatment. New MR imaging tools have been widely used to determine the grade, heterogeneity, and extent of brain tumors. Di...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章
doi：10.1016/j.nic.2011.01.010
更新日期：2011-02-01 00:00:00
abstract：:Although the diagnosis of retinoblastoma (Rb) is made primarily by means of clinical examination, CT and MR imaging are helpful to confirm the diagnosis, determine the extent of the intraocular tumor, and exclude extraocular or intracranial involvement. They are also valuable in differentiating Rb from lesions that si...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2005.02.003
更新日期：2005-02-01 00:00:00
abstract：:There are several tumors and tumorlike masses involving multiple spaces in the pediatric brain. Accurate diagnosis of tumors and distinguishing them from tumorlike masses is an important aspect in the diagnostic workup and plays a key role for management and prognosis. Neuroimaging plays an important role in (1) ident...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2016.08.006
更新日期：2017-02-01 00:00:00
abstract：:EEG-fMRI is capable of providing novel localizing information in a substantial proportion of patients with frequent epileptiform discharges, even at 1.5T, suggesting a potential clinical role. Increasing availability of equipment capable of providing good-quality intra-MR imaging EEG with relative ease should ensure a...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2004.04.009
更新日期：2004-08-01 00:00:00
abstract：:Intracranial hemorrhage is a common initial symptom of intracranial vascular malformations. Although CT remains important in the acute setting, MR imaging has proved invaluable for diagnosis and characterization of intracranial hemorrhage. MR imaging of hemorrhage and the differential diagnosis of nontraumatic intracr...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：
更新日期：1998-05-01 00:00:00
abstract：:More studies on the natural history of carotid artery plaques are needed to predict more reliably which plaque types or features are the most dangerous (see Table 2). Studies on carotid and coronary endarterectomy specimens indicate a dynamic process of rupture, thrombus formation, healing, and remodeling of the plaqu...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/s1052-5149(02)00015-1
更新日期：2002-08-01 00:00:00
abstract：:Approximately 30,000 spinal injuries occur in the United States every year. Injuries to the spine and its contents affect predominately young, healthy individuals and are a major cause of disability, with significant socioeconomic consequences. The main cause for spinal injuries is blunt trauma, most commonly caused b...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2006.11.006
更新日期：2007-02-01 00:00:00
abstract：:Mild cognitive impairment (MCI), a major risk factor for dementia, has an amnestic subtype that has a high probability of progressing to Alzheimer's disease. The rate of progression may be predicted by the severity of memory impairment at baseline, the severity of hippocampal atrophy, and, possibly, the presence of an...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2005.09.010
更新日期：2005-11-01 00:00:00
abstract：:Conventional neuroimaging is still the mainstay in the assessment of the acute, follow-up, and chronic settings of concussion and mild traumatic brain injury (mTBI). Computed tomography (CT) is preferred for the initial assessment of acute mTBI, repeat evaluation in acute mTBI with neurologic deterioration, and cautio...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2017.09.006
更新日期：2018-02-01 00:00:00
abstract：:Diffusion imaging is a functional MR imaging tool that creates tissue contrast representative of the random, microscopic translational motion of water molecules within human body tissues. Long considered a cornerstone MR imaging sequence for brain imaging, diffusion-weighted imaging (DWI) increasingly is used for head...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2020.04.001
更新日期：2020-08-01 00:00:00
abstract：:Central nervous system infections and sequelae in the pediatric population may present differently depending on the patient's stage of development. Infections contracted from conception through the neonatal period may affect central nervous system formation, whereas infections acquired later tend to cause parenchymal ...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：
更新日期：2000-05-01 00:00:00
abstract：:High-flow AVFs are a challenging problem in the pediatric age group. Venous occlusive changes develop as part of the dynamic response to these fistulas. The development of adequate venous collateral flow circumvents the destructive sequelae of longstanding venous hypertension. Without adequate collaterals, venous hype...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/s1052-5149(02)00093-x
更新日期：2003-02-01 00:00:00
abstract：:The neuroimaging of hydrocephalus from the perspective of the pediatric neurosurgeon is discussed. Processes with new developments in therapy and imaging are described, including congenital causes of hydrocephalus, unilateral hydrocephalus, trapped fourth ventricle, and benign external hydrocephalus. ...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：
更新日期：1999-02-01 00:00:00
abstract：:Despite considerable research evidence demonstrating significant neurobiological alterations in psychiatric disorders, incorporating neuroimaging approaches into clinical practice remains challenging. There is an urgent need for biologically validated psychiatric disease constructs that can inform diagnostic algorithm...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2019.09.005
更新日期：2020-02-01 00:00:00
abstract：:Neuro-otologists rely on the expertise and judgment of a skilled neuroradiologist to identify radiographic abnormalities in the complicated regional anatomy of the temporal bone and middle and posterior fossa, and more importantly, to alert the surgeon to potential operative pitfalls. This article highlights some of t...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2018.09.008
更新日期：2019-02-01 00:00:00
abstract：:Resting-state functional connectivity is the synchronization of brain regions with each another. Alterations are suggestive of neurologic or psychological disorders. This article discusses methods and approaches used to describe resting-state brain connectivity and the results in neurotypical and diseased brains. ...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2017.06.001
更新日期：2017-11-01 00:00:00
abstract：:Cerebral blood flow (CBF, cerebral perfusion) mirrors cerebral metabolic demand and neuronal function, and therefore, is a vital parameter in the evaluation of pediatric brain injury and recovery. Until recently, measurement of CBF involved intravenous bolus injection of contrast agents or nuclear medicine methods tha...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2005.10.002
更新日期：2006-02-01 00:00:00
abstract：:The salivary glands play an important role in digestion and oral hygiene, and give rise to a variety of benign and malignant pathologies. In suspected pathology, the goal of imaging is to confirm a lesion as being of salivary gland origin, narrow the list of differential considerations, define the extent of disease, a...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2018.01.001
更新日期：2018-05-01 00:00:00
abstract：:The epidemic of cardiovascular disease across most of Asia is at a different stage from that in the West; the incidence and prevalence of stroke are increasing steadily, associated with nutritional changes and aging of the population. Epidemiologic data, crucial in combating stroke, have been relatively sparse in Asia...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2005.07.001
更新日期：2005-05-01 00:00:00
abstract：:Recent advances in artificial intelligence (AI) and deep learning (DL) hold promise to augment neuroimaging diagnosis for patients with brain tumors and stroke. Here, the authors review the diverse landscape of emerging neuroimaging applications of AI, including workflow optimization, lesion segmentation, and precisio...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2020.07.003
更新日期：2020-11-01 00:00:00
abstract：:Extensive PET imaging research on AD has been conducted since PET scanners became available in the early 1980s. PET imaging using FDG, now commercially available, can detect early metabolic changes in AD and differential metabolic features of various dementing disorders. Image analysis techniques have also advanced in...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/s1052-5149(03)00099-6
更新日期：2003-11-01 00:00:00
abstract：:CT scanning of the jaws with cross-sectional images perpendicular to the curvature of the alveolar processes can be used to facilitate surgical planning for placement of dental implants. After ruling out pathologic changes, the radiographic evaluation concentrates on the dimensions of the alveolar processes relative t...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：
更新日期：1996-05-01 00:00:00
abstract：:Different types of malformations share a dilated vein of Galen, but only one of them is a true vein of Galen aneurysmal malformation (VGAM). The optimal window of opportunity for treatment is between 4 and 5 years of months [corrected], because this allows the child to grow and mature. Heart failure and hydrocephalus ...
journal_title：Neuroimaging clinics of North America
pub_type： 杂志文章,评审
doi：10.1016/j.nic.2007.02.005
更新日期：2007-05-01 00:00:00
