JP7085514B2 - Mriによりガイドされる放射線治療のための無線周波数バードケージコイル - Google Patents
Mriによりガイドされる放射線治療のための無線周波数バードケージコイル Download PDFInfo
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- JP7085514B2 JP7085514B2 JP2019071024A JP2019071024A JP7085514B2 JP 7085514 B2 JP7085514 B2 JP 7085514B2 JP 2019071024 A JP2019071024 A JP 2019071024A JP 2019071024 A JP2019071024 A JP 2019071024A JP 7085514 B2 JP7085514 B2 JP 7085514B2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34092—RF coils specially adapted for NMR spectrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
- G01R33/34076—Birdcage coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/4808—Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/4808—Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]
- G01R33/481—MR combined with positron emission tomography [PET] or single photon emission computed tomography [SPECT]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/4808—Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]
- G01R33/4812—MR combined with X-ray or computed tomography [CT]
Description
本PCT出願は、2013年3月12日に提出された特許文献1に対する優先権を主張し、出願日及び全ての開示はその全体の参照によってここに取り込まれる。
ρ=バルク抵抗率(オーム-メートル)
f=周波数(ヘルツ)
μ0=透磁率定数(ヘンリー/メートル)=4π×10-7
μr=非透磁率(通常 ~1)
したがって、例えば14.7MHzで、銅が導電性材料で、10個の表皮深さは0.172mmに略等しい。しかし、0.172mmの厚さを有する銅の層は、放射線ビーム15に対して、水の約1.53mm(計算:0.172mm×8.9(銅の密度/水の密度)=1.53mm)に略等しい減衰量を発生する。この減衰量は望ましくない減衰量である。しかし、有意な係数で放射線ビーム15の経路の銅の厚さを減少させることによって、減衰は満足なレベルに減少されることができる。例えば、放射線ビーム15の経路の銅の厚さが1/5倍で減少されるとき、銅によって発生される減衰は水の約0.3mm(計算:0.03302mm×8.9=0.3mm)に略等しい量に減少されることができる。
Claims (9)
- MRI(磁気共鳴画像化)によりガイドされる放射線治療システムであって、
放射線ビームを放射するように構成された放射線治療装置と、
ギャップによって分離された一対の主磁石、及び、前記ギャップを横切って延在する導電性ラングを有しており前記放射線ビームの経路にある中間部分を有するRF(無線周波数)送信コイルを含むオープンMRIシステムと、
前記放射線ビームが前記放射線治療装置によって放射されるとき、前記放射線ビームの経路の外側に配置される、PINダイオード減結合回路と、
を備え、
前記PINダイオード減結合回路は、前記放射線ビームの経路にある前記導電性ラングの前記中間部分と導体によって接続され、前記導体によって前記PINダイオード減結合回路が前記導電性ラングの中心から外れており前記放射線ビームの経路の外側にある位置に配置される、
MRI(磁気共鳴画像化)によりガイドされる放射線治療システム。 - 前記PINダイオード減結合回路は、前記導体として同軸ケーブルを用いて前記放射線ビームの経路の外側に配置される、請求項1に記載のMRIによりガイドされる放射線治療システム。
- 前記PINダイオード減結合回路は、前記導体として導体のツイストペアを用いて前記放射線ビームの経路の外側に配置される、請求項1に記載のMRIによりガイドされる放射線治療システム。
- 前記PINダイオード減結合回路は、前記導体としてセルフキャンセリング磁場プロファイルを有する幅広な並列導体を用いて前記放射線ビームの経路の外側に配置される、請求項1に記載のMRIによりガイドされる放射線治療システム。
- 前記MRIシステムは、1.0T未満の磁場強度を有する低磁場MRIシステムである、請求項1に記載のMRIによりガイドされる放射線治療システム。
- 前記放射線治療装置によって放射された前記放射線ビームの経路の外側に配置される同調キャパシタをさらに備える、請求項1に記載のMRIによりガイドされる放射線治療システム。
- 前記同調キャパシタが前記RF送信コイルのラングのギャップに配置される、請求項6に記載のMRIによりガイドされる放射線治療システム。
- 前記同調キャパシタが前記RF送信コイルのリングのギャップに配置される、請求項6に記載のMRIによりガイドされる放射線治療システム。
- 前記PINダイオード減結合回路は、前記送信コイルの導電性ラングの端部部分に隣接して配置され、前記中心を外れた前記放射線ビームの経路の外側の位置は前記導電性ラングの端部部分に隣接している、請求項1に記載のMRIによりガイドされる放射線治療システム。
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US13/796,784 US9404983B2 (en) | 2013-03-12 | 2013-03-12 | Radio frequency transmit coil for magnetic resonance imaging system |
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US (4) | US9404983B2 (ja) |
EP (2) | EP2972448B1 (ja) |
JP (2) | JP6509803B2 (ja) |
KR (1) | KR20150135337A (ja) |
CN (2) | CN105247381A (ja) |
AU (2) | AU2014240394B2 (ja) |
CA (1) | CA2904330A1 (ja) |
HK (1) | HK1220256A1 (ja) |
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US10466319B2 (en) | 2019-11-05 |
CA2904330A1 (en) | 2014-10-02 |
EP4220213A2 (en) | 2023-08-02 |
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AU2014240394B2 (en) | 2018-03-08 |
US20190331746A1 (en) | 2019-10-31 |
US9404983B2 (en) | 2016-08-02 |
WO2014159597A1 (en) | 2014-10-02 |
AU2018203988A1 (en) | 2018-06-21 |
JP6509803B2 (ja) | 2019-05-08 |
AU2014240394A1 (en) | 2015-09-24 |
CN111257808A (zh) | 2020-06-09 |
US11035916B2 (en) | 2021-06-15 |
EP2972448A1 (en) | 2016-01-20 |
US20170052236A1 (en) | 2017-02-23 |
EP4220213A3 (en) | 2023-11-01 |
US20140266206A1 (en) | 2014-09-18 |
AU2018203988B2 (en) | 2020-01-30 |
US20210356539A1 (en) | 2021-11-18 |
HK1220256A1 (zh) | 2017-04-28 |
CN111257808B (zh) | 2022-10-18 |
KR20150135337A (ko) | 2015-12-02 |
CN105247381A (zh) | 2016-01-13 |
JP2019130366A (ja) | 2019-08-08 |
JP2016512464A (ja) | 2016-04-28 |
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