作者: hereditary 時(shí)間: 2025-3-22 00:19 作者: 格子架 時(shí)間: 2025-3-22 00:52
Radiofrequency Coils,ies to control the RF fields which can only be put into practice at high fields. This chapter explains the basic principles of radiofrequency transmission and reception with specific focus on the challenges of UHF-MR and gives an overview of the state-of-the-art in this rapidly changing field.作者: Alveoli 時(shí)間: 2025-3-22 05:24 作者: subordinate 時(shí)間: 2025-3-22 10:46 作者: SEED 時(shí)間: 2025-3-22 13:05 作者: 幸福愉悅感 時(shí)間: 2025-3-22 18:23 作者: 對(duì)待 時(shí)間: 2025-3-22 23:40 作者: 法律 時(shí)間: 2025-3-23 04:04 作者: 六邊形 時(shí)間: 2025-3-23 07:35 作者: 溺愛(ài) 時(shí)間: 2025-3-23 10:23
Peter Dietz,Franz Schmitt,Jürgen HennigStates exemplifies the archetypical multiethnic and multiracial society. However, whether the immigrants had voluntary left or had been constrained to leave their native lands to start a new life in the United States, generally, they do not consider themselves as “transplanted” or “uprooted” people 作者: happiness 時(shí)間: 2025-3-23 15:29 作者: 從屬 時(shí)間: 2025-3-23 19:26 作者: 清楚 時(shí)間: 2025-3-23 23:46
Oliver Speck,Matthias Weigel,Klaus Schefflerf the middle class professional migrants who not only like to return to their homeland and sacrifice their temporary conveniences of the comfortable overseas living, they also teach their children the value of culture, a religious indoctrination.. His life becomes contingent, a perfect icon of moder作者: analogous 時(shí)間: 2025-3-24 02:27
Oliver Speck roots in their co-ethnic communities. Neither are they part of a chain of people that arrive together. As pioneer immigrants, they consciously develop and build relations, on which their business efforts rest. Yet their connections are resource poor. We can learn much about the evolution of communi作者: 膽汁 時(shí)間: 2025-3-24 10:35 作者: Medley 時(shí)間: 2025-3-24 12:32 作者: Harbor 時(shí)間: 2025-3-24 16:13 作者: Feigned 時(shí)間: 2025-3-24 20:57 作者: 不如屎殼郎 時(shí)間: 2025-3-25 00:08 作者: monopoly 時(shí)間: 2025-3-25 03:39 作者: 策略 時(shí)間: 2025-3-25 08:44
Duan Xu,Daniel B. Vigneronouffrance des patients atteints de paraphilies mais surtout la réduction du risque de récidive..Après avoir décrit l’évolution du concept dans l’histoire, ce livre aborde la délinquance sexuelle tant du point作者: Admonish 時(shí)間: 2025-3-25 13:32 作者: 煞費(fèi)苦心 時(shí)間: 2025-3-25 17:20 作者: 閑聊 時(shí)間: 2025-3-25 21:04
High-Field Superconducting Magnets,rable demands on the homogeneity and stability of such magnets. These demands are reflected in the design of the magnet coil windings, and the superconducting materials that are used in magnet construction. Furthermore, methods for the fine adjustment of the magnet homogeneity (often referred to as 作者: MIR 時(shí)間: 2025-3-26 02:32 作者: 易于交談 時(shí)間: 2025-3-26 05:56
Neuroscientific Applications of High-Field MRI in Humans,olution of MR tractography is limited to about 1.5?mm isotropic, hindering discrimination of crossing fibres. However, at fields of 7?T and above, the available high isotropic resolution of 0.4?mm and the varying myelin content of grey matter allow several cortical areas to be quite easily distingui作者: 侵蝕 時(shí)間: 2025-3-26 11:09 作者: Entreaty 時(shí)間: 2025-3-26 12:38 作者: chance 時(shí)間: 2025-3-26 17:46 作者: 彎彎曲曲 時(shí)間: 2025-3-26 21:13
Introduction,t NIH and at the Centre for Magnetic Resonance Research in Minnesota (CMRR). For more than a decade, the research teams working on these systems produced a constant stream of papers on the benefits, and the challenges of high field MR. Some of the early work—most notably early results on fMRI at 4T 作者: PAN 時(shí)間: 2025-3-27 04:51
High-Field Superconducting Magnets,medical diagnosis and many kinds of scientific research. MRI and MRS, however, remain fields characterized by a great deal of innovation. The main goal of this innovation is the improvement in the basic signal to noise ratio. One way whereby the signal to noise ratio can be improved is by increasing作者: amnesia 時(shí)間: 2025-3-27 07:10 作者: Grievance 時(shí)間: 2025-3-27 11:37
Radiofrequency Coils,gnificantly less than the body dimensions. An associated problem is the spatially inhomogeneous electric field that can produce localized thermal hot-spots. The use of transmit array coils, in which the magnitude and phase of the inputs to each element of the array are individually controlled, can s作者: Diskectomy 時(shí)間: 2025-3-27 16:54
Safety,g, and the radiofrequency fields used for signal transmission. The physical mechanisms are identical to those at conventional MR. Exposure levels in UHF-MR nevertheless reach values of concern necessitating appropriate measures to ensure safety of patients, volunteers, and operating and technical pe作者: 傷心 時(shí)間: 2025-3-27 19:17
Contrasts, Mechanisms and Sequences,ging systems and clinical MRI. The obvious motivation is the higher signal-to-noise ratio achievable. However, other effects that result from changes in the relaxation times, the ratio of the object extensions with respect to the RF wave length, or the deposited energy have to be considered. The bas作者: 怕失去錢(qián) 時(shí)間: 2025-3-27 23:51
What to do with All that Signal? Issues of High-resolution MRI,neity and SAR, has been given in ., together with some of the consequences and remedies for major MR imaging methods. In this chapter, a few general aspects and possible exploitations of the increased SNR at high field are described. In addition, limitations of improvements at high field strength an作者: Firefly 時(shí)間: 2025-3-28 03:45
Neuroscientific Applications of High-Field MRI in Humans,e. Neuroscientists are interested in the spatial organisation of brain grey matter, in cortex and deep brain structures, and in the connectivity of white matter neuronal fibres. At lower field, it is very hard to distinguish cortical areas purely by their anatomical differences, or to discriminate s作者: photophobia 時(shí)間: 2025-3-28 06:58 作者: NICE 時(shí)間: 2025-3-28 13:19
Oncology,ponse and early detection of recurrence. For all applications high field MRI can be advantageous, because the spatial resolution of the MR images is increasing with field strength, and thus smaller lesions become detectable. Furthermore, functional imaging techniques benefit from the higher field st作者: 爭(zhēng)議的蘋(píng)果 時(shí)間: 2025-3-28 15:41
,Advanced Musculoskeletal Magnetic Resonance Imaging at Ultra-high Field (7?T),ly suffer from low sensitivity at standard field strength (1.5?T). The high signal-to-noise ratio of the higher field systems provides biochemical and metabolic imaging in reasonable scan times, which promotes their widespread clinical application. This development enables the diagnosis of diseases 作者: Fabric 時(shí)間: 2025-3-28 19:51
High Field MR Spectroscopy: Investigating Human Metabolite Levels at High Spectral and Spatial Resoiological compounds non-invasively. Nevertheless, MRS has failed to broadly enter the clinical routine despite its success in scientific studies. Limitations in sensitivity, spatial resolution, and spectral identification, which can be severe at lower fields, are reduced for ultra-high field MRS all作者: happiness 時(shí)間: 2025-3-29 02:16
Molecular and Translational Research,molecular imaging’, the field has taken a new twist by strengthening the link of research on animal models with molecular biology at one side and with applications in translational research on humans on the other side. Given the wealth of research in small animal MR over the past and especially the 作者: Lament 時(shí)間: 2025-3-29 04:18 作者: Triglyceride 時(shí)間: 2025-3-29 10:33 作者: 和藹 時(shí)間: 2025-3-29 14:09
Peter Dietz,Franz Schmitt,Jürgen Hennigonably, the substance of Americaness has been achieved through the travails and experiences of immigrants who have arrived on the shores of the United States from all parts of the world during the last five centuries to revitalize and reinvent the culture. According to Ware, immigrants and their chi作者: overture 時(shí)間: 2025-3-29 19:06 作者: Lipoprotein(A) 時(shí)間: 2025-3-29 21:04 作者: interference 時(shí)間: 2025-3-30 00:20
Oliver Speck,Matthias Weigel,Klaus Scheffler Rushdie’s novels that characterize the minds of an immigrant. However, is this reflexive self-assessment an attribute of all the migrants? Should we revive the moribund — if not fully defunct — concept of class and assert that most often it is a sense of ambivalence with which the middle class migr作者: fulcrum 時(shí)間: 2025-3-30 05:36
Oliver Speck employers do not recognize the credentials of immigrant professional and technical workers. As a result, many turn to self employment. This paper studies entrepreneurship by a number of former professional and skilled new immigrants from China. We discuss the dynamics of starting a business in rela作者: Confound 時(shí)間: 2025-3-30 08:41
Robert Turneralysis: The Kannan-Lovasz-Simmonovits Conjecture and the Var.Focusing on two central conjectures of Asymptotic Geometric Analysis, the Kannan-Lovász-Simonovits spectral gap conjecture and the variance conjecture, these Lecture Notes present the theory in an accessible way, so that interested readers作者: aspersion 時(shí)間: 2025-3-30 13:50
Mark E. Ladd,Elke R. Gizewski,Dagmar Timmannalysis: The Kannan-Lovasz-Simmonovits Conjecture and the Var.Focusing on two central conjectures of Asymptotic Geometric Analysis, the Kannan-Lovász-Simonovits spectral gap conjecture and the variance conjecture, these Lecture Notes present the theory in an accessible way, so that interested readers作者: ligature 時(shí)間: 2025-3-30 20:22
Michael Bock,Stefan Delorme,Lars Gerigknt d’excellents ouvrages qui peuvent servir de référence, à tout moment, au traitement de n’importe quel défect cutané, de la main…ou d’ailleurs. ..Nous avons souhaité un tout autre éclairage de la prise en charge des traumatismes ouverts de la main, tout en respectant l’esprit de la collection ?App
