Array Coils | 合法醫療器材資訊網

2019年4月21日—Phased-arraycoilscombinemultiplesmallcoilelementstotransmitorreceivesignalusingindependentchannels.Arraycoilswerefirst ...

The basic principle of RF coils is to create a B 1 magnetic field that rotates the magnetization of the nuclei (Tx coils) or to measure signal emitted by the resonating nuclei in the transverse plane (Rx coils). Both Tx and Rx coils are tuned to the Larmor frequency ( <SPAN role=presentation tabIndex=0 id=MathJax-Element-1-Frame class=MathJax style="POSITION: relative" data-mathml=ω’>ωωω), at which particles can exchange energy. The Larmor frequency depends on the gyromagnetic ratio of the particle ( <SPAN role=presentation tabIndex=0 id=MathJax-Element-2-Frame class=MathJax style="POSITION: relative" data-mathml=γ’>γγγ) and on the magnetic field strength they are submitted to ( B ), according to <SPAN role=presentation tabIndex=0 id=MathJax-Element-3-Frame class=MathJax style="POSITION: relative" data-mathml=ω=γB’>ω=γBω=γBω ...