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    • 4. 发明授权
    • 공진 주파수 변동 보정 방법 및 MRI 장치
    • 공진주파수변동보정방법및MRI장치
    • KR100458781B1
    • 2004-12-03
    • KR1020020018137
    • 2002-04-03
    • 지이 메디컬 시스템즈 글로발 테크놀러지 캄파니 엘엘씨
    • 우에타케노조무
    • A61B5/055
    • G01R33/56563
    • A method of correcting a resonance frequency variation and an MRI apparatus both capable of handling all frequency drifts including a frequency drift whose time change is slow, a frequency drift in a slice direction and a frequency drift whose time change is fast. An amount of a resonance frequency variation is measured, the frequency variation is corrected when an amount of the resonance frequency variation is smaller than a threshold value, and the amount of the resonance frequency variation is not stored. On the other hand, when the amount of the resonance frequency variation is not smaller than the threshold value, the amount of the resonance frequency variation is stored and correction operation is made based thereon later.
    • 一种校正共振频率变化的方法和一种MRI装置,它们都能够处理包括时间变化缓慢的频率漂移,切片方向上的频率漂移和时间变化快的频率漂移的所有频率漂移。 测量谐振频率变化量,当谐振频率变化量小于阈值时校正频率变化,并且不存储谐振频率变化量。 另一方面,当共振频率变化量的量不小于阈值时,共振频率变化量被存储并且稍后基于此进行校正操作。