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During the scanning of magnetic resonance imaging (MRI) system, the main acoustic noise source comes from the gradient coils. The gradient coils are turned on and off repeatedly, thus producing noise within the coil. With increasing magnetic field strength, the noise also increases. The primary method to reduce the noise is to decrease the distribution of the Lorentz forces. Target field (TF) method is very important for designing gradient coils which have been used in MRI and other applications. Many works based on the Turner’s traditional TF method have been proposed. In this paper, a target field method combined with vibration control has been presented to analyze the deflection of a cylindrical z-gradient coil because of the Lorentz forces. Simulation results via Matlab show that the maximum vibration amplitude can be reduced effectively by the new design method proposed in this paper.
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Keywords:
- z-gradient coil /
- target field method /
- Lorentz force /
- vibration
[1] Li L K, Wang H S, Ni Z P, Cheng J S, Wang Q L 2013 Acta Phys. Sin. 62 058403 (in Chinese) [李兰凯, 王厚生, 倪志鹏, 程军胜, 王秋良 2013 62 058403]
[2] Wang Q L 2013 Progress in Physics 33 1
[3] Jackson J M, Brideson M A, Forbes L K, Crozier S 2010 Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 37B 167
[4] Brideson M A, Forbes L K, Jackson J, Crozier S 2008 ANZIAM 49 C423
[5] Forbes L K, Brideson M A, Crozier S, While P T 2007 Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 31B 218
[6] Forbes L K, Brideson M A, Crozier S, While P T 2007 ANZIAM J. 49 C17
[7] Turner R 1986 Physics D: Applied Physics 19 L147
[8] Turner R 1993 Magnetic Resonance Imaging 11 903
[9] Forbes L K, Crozier S 2001 Physics D: Applied Physics 34 3447
[10] Forbes L K, Crozier S 2002 Physics D: Applied Physics 35 839
[11] Forbes L K, Crozier S 2003 Physics D: Applied Physics 36 68
[12] Liu W T, Zu D L, Tang X, Guo H 2007 Physics D: Applied Physics 40 4418
[13] Liu W T, Zu D L, Tang X 2010 Chin. Phys. B 19 018701
[14] You X F, Yang W H, Song T, Hu L L, Wang H X 2011 Bioelectronics and Bioinformatics, Suzhou, China Nov 3–5, 2011, p115
[15] Wang Q L 2007 (Beijing: Science Press) p118–128 (in Chinese) [王秋良 2007 高磁场超导磁体科学(北京: 科学出版社)第118–128页]
[16] Wang Q L 2013 Practical Design of Magnetostatic Structure Using Numerical Simulation (Singapore: Wiley) pp400–411
[17] Brideson M A, Forbes L K 2002 Concepts in Magnetic Resonance 14 9
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[1] Li L K, Wang H S, Ni Z P, Cheng J S, Wang Q L 2013 Acta Phys. Sin. 62 058403 (in Chinese) [李兰凯, 王厚生, 倪志鹏, 程军胜, 王秋良 2013 62 058403]
[2] Wang Q L 2013 Progress in Physics 33 1
[3] Jackson J M, Brideson M A, Forbes L K, Crozier S 2010 Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 37B 167
[4] Brideson M A, Forbes L K, Jackson J, Crozier S 2008 ANZIAM 49 C423
[5] Forbes L K, Brideson M A, Crozier S, While P T 2007 Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 31B 218
[6] Forbes L K, Brideson M A, Crozier S, While P T 2007 ANZIAM J. 49 C17
[7] Turner R 1986 Physics D: Applied Physics 19 L147
[8] Turner R 1993 Magnetic Resonance Imaging 11 903
[9] Forbes L K, Crozier S 2001 Physics D: Applied Physics 34 3447
[10] Forbes L K, Crozier S 2002 Physics D: Applied Physics 35 839
[11] Forbes L K, Crozier S 2003 Physics D: Applied Physics 36 68
[12] Liu W T, Zu D L, Tang X, Guo H 2007 Physics D: Applied Physics 40 4418
[13] Liu W T, Zu D L, Tang X 2010 Chin. Phys. B 19 018701
[14] You X F, Yang W H, Song T, Hu L L, Wang H X 2011 Bioelectronics and Bioinformatics, Suzhou, China Nov 3–5, 2011, p115
[15] Wang Q L 2007 (Beijing: Science Press) p118–128 (in Chinese) [王秋良 2007 高磁场超导磁体科学(北京: 科学出版社)第118–128页]
[16] Wang Q L 2013 Practical Design of Magnetostatic Structure Using Numerical Simulation (Singapore: Wiley) pp400–411
[17] Brideson M A, Forbes L K 2002 Concepts in Magnetic Resonance 14 9
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