Active-passive gradient shielding for MRI acoustic noise reduction

Autor:	Robert W. Brown, T. K. Kidane, William A. Edelstein, Tanvir Baig, V. Taracila, T. P. Eagan, John A. Mallick, Yu Chung N Cheng
Rok vydání:	2005
Předmět:	Cryostat Materials science Acoustics Noise reduction Equipment Design Magnetic Resonance Imaging Vibration law.invention Noise law Shield Magnet Shielded cable Electromagnetic shielding Radiology Nuclear Medicine and imaging Copper
Zdroj:	Magnetic Resonance in Medicine. 53:1013-1017
ISSN:	1522-2594 0740-3194
DOI:	10.1002/mrm.20472
Popis:	An important source of MRI acoustic noise-magnet cryostat warm-bore vibrations caused by eddy-current-induced forces-can be mitigated by a passive metal shield mounted on the outside of a vibration-isolated, vacuum-enclosed shielded gradient set. Finite-element (FE) calculations for a z-gradient indicate that a 2-mm-thick Cu layer wrapped on the gradient assembly can decrease mechanical power deposition in the warm bore and reduce warm-bore acoustic noise production by about 25 dB. Eliminating the conducting warm bore and other magnet parts as significant acoustic noise sources could lead to the development of truly quiet, fully functioning MRI systems with noise levels below 70 dB.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb18efbbd53727d2d6cbbaee2c7fcead https://doi.org/10.1002/mrm.20472 Zobrazit plný text záznamu Plný text