| 書目名稱 | Ultra High Field Magnetic Resonance Imaging | | 編輯 | Pierre-Marie Robitaille,Lawrence Berliner | | 視頻video | http://file.papertrans.cn/941/940387/940387.mp4 | | 概述 | The up-to-date latest volume in the Biological Magnetic Resonance series | | 叢書名稱 | Biological Magnetic Resonance | | 圖書封面 |  | | 描述 | From the early examples of what was to be called MRI, extending the te- nique to higher fields than those of less than 0. 1 T used in the first large-volume instruments was a goal, but the way there was unclear. The practical success of large superconducting magnets was a surprise, and the astonishment continued as they developed fields from 0. 3 T to 0. 6 T to 1. 5 T, and even more, up to the now common 3T systems, and a few 4T machines, and now to about 100 times the fields used in the first medium- and large-bore devices. In the early machines, low radiofrequencies of 4 MHz or so meant that RF coil designs were simple (even inexperienced undergraduates could design and build such circuits with little knowledge of more than DC electrical circuits), and the forces on gradient coils were small. The effects of magnetic susceptibility in- mogeneity in and around the object being imaged were negligible, and RF penet- tion depths were not a problem for human-scale samples. Everything began to change as higher fields and higher frequencies came into use, and the earlier idyllic simplicities began to seem quaint. The trend continued, however, driven by the increased signal-to-noise ratio | | 出版日期 | Book 2006 | | 關(guān)鍵詞 | biochemistry; brain; brain imaging; imaging; magnetic fields; magnetic resonance; magnetic resonance imagi | | 版次 | 1 | | doi | https://doi.org/10.1007/978-0-387-49648-1 | | isbn_softcover | 978-1-4899-7337-5 | | isbn_ebook | 978-0-387-49648-1Series ISSN 0192-6020 Series E-ISSN 2512-2215 | | issn_series | 0192-6020 | | copyright | Springer-Verlag US 2006 |
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