![]() A detuning circuit according to claim 9, wherein said detuning switch includes a crossed diode configuration.ġ1. A detuning circuit for an MRI coil, said MRI coil having a series tuning capacitor, said circuit comprising: a detuning inductor and a detuning switch in parallel combination with a secondary tuning capacitor, said detuning inductor and said parallel combination being in parallel communication with said series tuning capacitor, said secondary tuning capacitor acting to reduce current during detuning of said MRI coil.ġ0. A detuning circuit according to claim 1, wherein said detuning circuit is configured to operate in connection with an active PIN diode circuit.ĩ. A detuning circuit according to claim 1, further comprising a DC blocking capacitor connected in series with said detuning inductor.Ĩ. ![]() A detuning circuit according to claim 1, further comprising a bias capacitor and wherein said common node of said first diode and said second diode is connected to said detuning inductor node through said bias capacitor.ħ. A detuning circuit according to claim 1, wherein said first diode and said second diode comprise switching diodes.Ħ. A detuning circuit according to claim 1, further comprising providing a bias current for said PIN diode.ĥ. A detuning circuit according to claim 1, wherein said reactance is inductive.Ĥ. A detuning circuit according to claim 1, wherein said reactance is capacitive.ģ. A detuning circuit for an MRI coil, said MRI coil having a series tuning capacitor, said circuit comprising: a detuning inductor and a PIN diode in series and together in parallel communication with said tuning capacitor, said tuning capacitor having a detuning inductor node and a PIN diode node a first diode and a second diode in parallel communication with said PIN diode, said first, second and PIN diodes being arranged with the same serial polarity and said first and second diodes having a common node and a reactance in communication between said common node and said detuning inductor node, said circuit detuning said MRI coil in response to an MRI transmit pulse.Ģ.
0 Comments
Leave a Reply. |