Thermoelastic Pressure Waves Induced Inside the Human Head by RF Pulses From High Pass Birdcage Coils
Wang Z, Lin J
Penn State College of Medicine,
This paper investigates the thermoelastic pressure waves generated by RF pulses absorbed by human head inside MRI coils. The RF induced pressure waves in a human head (without shoulder and neck) loading high-pass birdcage coils of 64 MHz (1.5T), 300 MHz (7.0T) and 400 MHz (9.4T) were computed using the FDTD method. The effect of different pulse width was also investigated. Results for the peak pressure, SAR and pressure distribution are obtained - indicating that the induced thermoelastic pressure waves are functions of RF frequency, power absorption and pulse width.