Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator.
Radiofrequency (RF) shields that surround MRI transmit/receive coils should provide effective RF screening, without introducing unwanted eddy currents induced by gradient switching. Results are presented from a detailed examination of an effective RF shield design for a prototype transverse electrom...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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2002
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| _version_ | 1797080060114501632 |
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| author | Alecci, M Jezzard, P |
| author_facet | Alecci, M Jezzard, P |
| author_sort | Alecci, M |
| collection | OXFORD |
| description | Radiofrequency (RF) shields that surround MRI transmit/receive coils should provide effective RF screening, without introducing unwanted eddy currents induced by gradient switching. Results are presented from a detailed examination of an effective RF shield design for a prototype transverse electromagnetic (TEM) resonator suitable for use at 3 Tesla. It was found that effective RF shielding and low eddy current sensitivity could be achieved by axial segmentation (gap width = 2.4 mm) of a relatively thick (35 microm) copper shield, etched on a kapton polyimide substrate. This design has two main advantages: first, it makes the TEM less sensitive to the external environment and RF interference; and second, it makes the RF shield mechanically robust and easy to handle and assemble. |
| first_indexed | 2024-03-07T00:54:43Z |
| format | Journal article |
| id | oxford-uuid:87a48cd2-94d6-4790-924d-35a14769d205 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:54:43Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:87a48cd2-94d6-4790-924d-35a14769d2052022-03-26T22:12:00ZCharacterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:87a48cd2-94d6-4790-924d-35a14769d205EnglishSymplectic Elements at Oxford2002Alecci, MJezzard, PRadiofrequency (RF) shields that surround MRI transmit/receive coils should provide effective RF screening, without introducing unwanted eddy currents induced by gradient switching. Results are presented from a detailed examination of an effective RF shield design for a prototype transverse electromagnetic (TEM) resonator suitable for use at 3 Tesla. It was found that effective RF shielding and low eddy current sensitivity could be achieved by axial segmentation (gap width = 2.4 mm) of a relatively thick (35 microm) copper shield, etched on a kapton polyimide substrate. This design has two main advantages: first, it makes the TEM less sensitive to the external environment and RF interference; and second, it makes the RF shield mechanically robust and easy to handle and assemble. |
| spellingShingle | Alecci, M Jezzard, P Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator. |
| title | Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator. |
| title_full | Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator. |
| title_fullStr | Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator. |
| title_full_unstemmed | Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator. |
| title_short | Characterization and reduction of gradient-induced eddy currents in the RF shield of a TEM resonator. |
| title_sort | characterization and reduction of gradient induced eddy currents in the rf shield of a tem resonator |
| work_keys_str_mv | AT aleccim characterizationandreductionofgradientinducededdycurrentsintherfshieldofatemresonator AT jezzardp characterizationandreductionofgradientinducededdycurrentsintherfshieldofatemresonator |