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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林發暄 | |
| dc.contributor.author | Jiazheng Zhou | en |
| dc.contributor.author | 周家政 | zh_TW |
| dc.date.accessioned | 2021-06-17T02:00:31Z | - |
| dc.date.available | 2017-07-20 | |
| dc.date.copyright | 2017-07-20 | |
| dc.date.issued | 2017 | |
| dc.date.submitted | 2017-07-19 | |
| dc.identifier.citation | [1] Koch KM, Rothman DL, de Graaf RA. Optimization of static magnetic field homogeneity in the human and animal brain in vivo. Progress in nuclear magnetic resonance spectroscopy 2009;54(2):69.
[2] Romeo F, Hoult DI. Magnet field profiling: analysis and correcting coil design. Magnetic Resonance in Medicine 1984;1(1):44-65. [3] Golay MJE. Field homogenizing coils for nuclear spin resonance instrumentation. Review of Scientific Instruments 1958;29(4):313-315. [4] Juchem C, Nixon TW, McIntyre S, Rothman DL, de Graaf RA. Magnetic field homogenization of the human prefrontal cortex with a set of localized electrical coils. Magn Reson Med 2010;63(1):171-80. [5] Juchem C, Umesh Rudrapatna S, Nixon TW, de Graaf RA. Dynamic multi-coil technique (DYNAMITE) shimming for echo-planar imaging of the human brain at 7 Tesla. NeuroImage 2015;105:462-472. [6] de Graaf RA, Juchem C. CHAPTER 4 B0 Shimming Technology. Magnetic Resonance Technology: Hardware and System Component Design: The Royal Society of Chemistry; 2016. p 166-207. [7] Han H, Song AW, Truong TK. Integrated parallel reception, excitation, and shimming (iPRES). Magn Reson Med 2013;70(1):241-7. [8] Stockmann JP, Witzel T, Blau J, Polimeni JR, Zhao W, Keil B, Wald LL. Combined shim-RF array for highly efficient shimming of the brain at 7 Tesla. Proceedings of the 21st Annual Meeting of ISMRM, Salt Lake City, Utah, USA 2013. p 665. [9] Stockmann, J. P., Witzel, T., Keil, B., Polimeni, J. R., Mareyam, A., LaPierre, C., Setsompop, K. and Wald, L. L., “A 32-channel combined RF and B0 shim array for 3T brain imaging”, Magn Reson Med 2016; 77(1): 441–451. [10] Truong TK, Darnell D, Song AW. Integrated RF/shim coil array for parallel reception and localized B0 shimming in the human brain. NeuroImage 2014;103:235-240 [11] Irarrazabal P, Meyer CH, Nishimura DG, Macovski A. Inhomogeneity correction using an estimated linear field map. Magn Reson Med 1996;35(2):278-282. [12] Smith SM, Jenkinson M, Woolrich MW, Beckmann CF, Behrens TEJ, Johansen-Berg H, Bannister PR, De Luca M, Drobnjak I, Flitney DE, et al. Advances in functional and structural MR image analysis and implementation as FSL. Neuroimage 2004;23:S208–S219. [13] Jenkinson M, Bannister P, Brady M, Smith S. Improved Optimization for the Robust and Accurate Linear Registration and Motion Correction of Brain Images. NeuroImage 2002;17(2):825-841. [14] Juchem C, Nixon TW, McIntyre S, Boer VO, Rothman DL, de Graaf RA. Dynamic multi-coil shimming of the human brain at 7 T. J Magn Reson 2011;212(2):280-288. [15] Stockmann JP, Wald L. Radio Frequency Laboratory of the Wald Group at MGH web site, https://rflab.martinos.org/index.php/Multi-coil_B0_shimming. Published Aug 29, 2016. Accessed May 8, 2017. [16] Arango N, Stockmann JP, Witzel T, Wald LL and White J. Open-source, low-cost, flexible, current feedback-controlled driver circuit for local B0 shim coils and other applications. In Proceedings of the 24th Annual Meeting of ISMRM, Singapore, 2016. p. 1157. [17] Arango N, Stockmann JP, Witzel T, Wald LL and White J. Open-Source Acquisition-speed slice-by-slice controller for 32 coil B0 shimming. In Proceedings of the 25th Annual Meeting of ISMRM, Honolulu, Hawaii, USA, 2017. #2682 [18] Kellman P, McVeigh ER. Image reconstruction in SNR units: a general method for SNR measurement. Magnetic resonance in medicine 2005;54(6):1439-1447 [19] Smith SM, Jenkinson M, Woolrich MW, Beckmann CF, Behrens TEJ, Johansen-Berg H, Bannister PR, De Luca M, Drobnjak I, Flitney DE, et al. Advances in functional and structural MR image analysis and implementation as FSL. Neuroimage 2004;23:S208–S219. [20] Smith SM. Fast robust automated brain extraction. Hum Brain Mapp 2002;17:143–155. [21] Camacho CR, Plewes DB, Henkelman RM. Nonsusceptibility artifacts due to metallic objects in MR imaging. Journal of Magnetic Resonance Imaging 1995;5(1):75-88. [22] P. Van Gelderen, J.A. De Zwart, P. Starewicz, R.S. Hinks, J.H. Duyn, Realtime shimming to compensate for respiration-induced B0 fluctuations, Magn. Reson. Med. 2007;57(2):362–368. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/67957 | - |
| dc.description.abstract | 一個均勻的主磁場是高品質磁共振影像或是頻譜的重要保障。然而，主磁場的靜態或者動態的擾動，使得磁共振信號減弱，並產生相應的偽影。
使用多通道勻場線圈能夠幫助克服主磁場局部不均勻多問題。在此基礎之上，發展出了整合射頻信號接收的均場線圈（iPRES）。然而， 將勻場線圈整合到多通道射頻線圈中，往往會導致射頻線圈的信噪比下降。在這篇文章中，我們發現，將勻場線圈與射頻線圈垂直放置，不僅僅能夠減少勻場線圈對於射頻線圈的干擾，還能夠保持勻場線圈的勻場效果。我們設計、製作了一個7通道的正交均場線圈，用來展示我們的想法 | zh_TW |
| dc.description.abstract | High-quality magnetic resonance imaging and spectroscopic measurements require a highly homogeneous magnetic field. However, both static and dynamic variations in the main magnetic field (B0) cause various artifacts. These artifacts can be corrected by providing a compensating magnetic field generated by shim coils. Different from correcting global magnetic field inhomogeneity by large volume shim coils, localized off-resonance can be corrected by using multiple shim coils. Previously, arrays of circular shim coils and integrated radio-frequency (RF)-shimming coils have been implemented. However, these designs cause non-negligible interference to RF coils and consequent image quality degradation.
Here we propose a new design of multi-coil shimming, where shim coils and nearby RF coils are arranged on two orthogonal planes. This orthogonal positioning minimizes the interference between RF coils and shim coils, while multiple shim coils provide similar shimming performance like previous multi-coil shim array designs. We use both simulatiosn and phantom experiments to demonstrate the feasibility of this design. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T02:00:31Z (GMT). No. of bitstreams: 1 ntu-106-R03548057-1.pdf: 4144162 bytes, checksum: bf1eb6b826fa4b50f5063869f527854c (MD5) Previous issue date: 2017 | en |
| dc.description.tableofcontents | 誌謝 i
中文摘要 ii ABSTRACT iii CONTENTS iv Chapter 1 Introduction 1 Chapter 2 Methods 5 2.1 Simulations 5 2.2 Hardware 8 2.3 Experiments 9 Chapter 3 Results 11 Chapter 4 Discussions 19 Chapter 5 Conclusions 22 Chapter 6 Supporting information 23 REFERENCE 25 | |
| dc.language.iso | en | |
| dc.title | 3T人腦磁共振多通道勻場線圈之優化 | zh_TW |
| dc.title | Optimization of multi-coil shim for human brain magnetic resonance imaging at 3T | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 105-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 鍾孝文,曾文毅,黃騰毅 | |
| dc.subject.keyword | 陣列,主磁場,均勻,正交, | zh_TW |
| dc.subject.keyword | array,magnetic field,homogeneity,orthogonal, | en |
| dc.relation.page | 27 | |
| dc.identifier.doi | 10.6342/NTU201701640 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2017-07-19 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 醫學工程學研究所 | zh_TW |
| 顯示於系所單位： | 醫學工程學研究所 | |
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