Electrothermal modeling of PIN diode protection circuits in MRI surface coils

Author

Caverly, Robert H.

Author_Institution

ECE Dept., Villanova Univ., Villanova, PA, USA

fYear

2014

fDate

19-23 Jan. 2014

Firstpage

253

Lastpage

255

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium (RWS), 2014 IEEE

Conference_Location

Newport Beach, CA

Print_ISBN

978-1-4799-2298-7

Type

conf

DOI

10.1109/RWS.2014.6830133

Filename

6830133