基本信息:
- 专利标题： Switchable birdcage coil
- 专利标题（中）：可切换双绞线
- 申请号：JP2008309611 申请日：2008-12-04
- 公开(公告)号：JP2009148556A 公开(公告)日：2009-07-09
- 发明人： WONG WAI HA , RATH ALAN R , SUDDARTH STEVEN A
- 申请人： Varian Inc , バリアン・インコーポレイテッド
- 专利权人： Varian Inc,バリアン・インコーポレイテッド
- 当前专利权人： Varian Inc,バリアン・インコーポレイテッド
- 优先权： US415007 2007-12-19
- 主分类号： A61B5/055
- IPC分类号： A61B5/055 ; G01R33/34
摘要：
PROBLEM TO BE SOLVED: To rapidly block residual currents that arise from any RF voltage used for producing a transmitter RF magnetic field.
SOLUTION: To prevent the switchable birdcage coil from absorbing energy by coupling to the receiver coil or by absorbing power from the RF field produced by the precessing nuclear spins, one or more of the reactive elements 16 of the birdcage coil are switched from a normal reactive impedance state to a high impedance state. The high impedance state is formed by switchably combining the reactive element 16 with a complementary reactive element 31 thereby performing tuning to resonate a combining circuit at the NMR frequency.
COPYRIGHT: (C)2009,JPO&INPIT
摘要（中）：
SOLUTION: To prevent the switchable birdcage coil from absorbing energy by coupling to the receiver coil or by absorbing power from the RF field produced by the precessing nuclear spins, one or more of the reactive elements 16 of the birdcage coil are switched from a normal reactive impedance state to a high impedance state. The high impedance state is formed by switchably combining the reactive element 16 with a complementary reactive element 31 thereby performing tuning to resonate a combining circuit at the NMR frequency.
COPYRIGHT: (C)2009,JPO&INPIT
要解决的问题：快速阻断由用于产生发射机RF磁场的任何RF电压产生的剩余电流。 解决方案：为了防止可切换的鸟笼线圈通过耦合到接收器线圈而吸收能量或通过从由进动的核自旋产生的RF场吸收能量，鸟笼线圈的一个或多个无功元件16从 正常的无功阻抗状态到高阻抗状态。 高阻抗状态通过将可变元件16与互补电抗元件31可切换地组合，从而进行调谐以使NMR频率下的组合电路谐振而形成。 版权所有（C）2009，JPO＆INPIT
信息查询:
EspacenetIPC结构图谱:
| A | 人类生活必需 |
| --A61 | 医学或兽医学；卫生学 |
| ----A61B | 诊断；外科；鉴定 |
| ------A61B5/00 | 用于诊断目的的测量；人的辨识 |
| --------A61B5/04 | .测量人体或人体各部分的生物电信号 |
| ----------A61B5/055 | ..包含电磁共振（EMR）或核磁共振（NMR）的，例如磁共振成像 |