Abstract
AbstractDecoupler circuits are the primary circuits used to maintain safety and image quality in switching magnetic resonance imaging (MRI) surface coils. Decoupler circuits predominantly employ PIN diodes as a switch and their performance is most commonly calculated on the bench at DC and low power RF conditions. The effects of high‐power RF on PIN diode decoupler circuits are not usually measured. Experiments at high RF power levels reveal a decrease in the impedance of a typical decoupler as the PIN diode operates in the nonlinear region, effectively increasing the ON‐resistance of the PIN diode. The constraints that dictate the start of nonlinearities are studied, and ways to control these nonlinearities are presented. Furthermore, this work is used as a basis to extend and improve upon previous work that established figure of merit (FOM) for PIN diode decouplers. This study is a comprehensive guide for MRI coil designers who face the task of designing decoupler circuits for surface coils and are looking for tools to accurately estimate the dynamic impedance of the circuit over the course of an MRI sequence.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
