Title :
Electrothermal modeling of PIN diode protection circuits in MRI surface coils
Author :
Caverly, Robert H.
Author_Institution :
ECE Dept., Villanova Univ., Villanova, PA, USA
Abstract :
A study of the temperature rise in MRI coil PIN diode protection circuits is presented. The study is based on a previously defined electrothermal model for the PIN diode that is applied to MR surface coils. The model shows a rapid rise in the PIN diode temperature with application of the MR transmit pulse and for low duty cycle MR pulse sequences, the diode cools significantly during the off-phase of the MR transmit pulse. For commercial surface coil protection diodes, a continuous temperature above approximately 125 °C will result in diode destruction, and this new electrothermal model allows MR coil designers the ability to predict temperature effects as part of the full design of the coil.
Keywords :
VHF circuits; coils; magnetic resonance imaging; p-i-n diodes; thermal management (packaging); MR transmit pulse; MRI surface coils; PIN diode protection circuits; PIN diode temperature; commercial surface coil protection diodes; diode destruction; electrothermal modeling; low duty cycle MR pulse sequences; magnetic resonance imaging system; temperature 125 degC; temperature effect prediction; thermal management; thermal resistance; Coils; Integrated circuit modeling; Magnetic resonance imaging; PIN photodiodes; Radio frequency; Thermal resistance; electrothermal effects; magnetic resonance imaging; p-i-n diodes; thermal management of electronics; thermal resistance;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2014 IEEE
Conference_Location :
Newport Beach, CA
Print_ISBN :
978-1-4799-2298-7
DOI :
10.1109/RWS.2014.6830133
