___________________ is an example of how the transmission of gradient magnetic fields have been used therapeutically for decades. 

True or False. What we call “acoustic noise” is actually a pressure wave transmitted through the air

Which organization developed limits for MRI patients and workers regarding peripheral nerve stimulation (PNS) based on time varying magnetic fields (TVMF)?  

The major safety concern with implanted electrical devices is the magnetic pull toward the bore of the scanner.

What is the MRI operating mode that is considered safe for all patients and TVMF limits are at 80% of the median perception threshold of the population?

The absolute limit for MR scanner acoustic noise level is ______________, even though pain and hearing damage is below this level.

Per OSHA dB level standards, humans should limit exposure of dB levels at 115 dB to _______________. This is the dB of EPI sequences.

Decibel levels of MRI scanner sequences are in the range of  ______________________.

Which of the following statements about peripheral nerve stimulation are true?

There are always _____________ hydrogen nuclei aligned in the spin-up (parallel) direction compared to the spin-down (anti-parallel) direction.