As MRI continues to push towards faster imaging, higher resolution, and greater patient throughput, RF safety constraints are increasingly becoming the limiting factor rather than gradient performance or acquisition time.

This talk will provide a practical overview of RF safety in contemporary MRI, with particular emphasis on the relationship between SAR, B1+RMS, duty cycle, field strength, and pulse sequence design. The differences between traditional SAR-based monitoring and newer B1+RMS approaches will be discussed, alongside the implications for implants, MR-conditional devices, and modern regulatory guidance.
Examples from fast spin echo, diffusion, cardiac, and ultra-high-field imaging will demonstrate how sequence optimisation, RF pulse design, parallel transmit technologies, and intelligent protocol management can enable rapid imaging while remaining within safe operating limits. The presentation will also examine common misconceptions surrounding RF heating, why “faster” does not always mean “safer,” and how future AI-driven protocol optimisation may further change the balance between image quality, speed, and patient safety.

The presentation will conclude by considering whether RF safety is becoming the true limitation in MRI acquisition speed and how users can continue to push performance without setting fire to the protocol book.