Blog

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.

True or False.  The FDA currently limits clinical magnets to: 8 T for adults and children over 1m

Please read carefully. True or False. First level controlled operating mode must be consciously accessed via an acknowledgement box for the operator to confirm and reaches 120% of the median perception threshold of the population.

Pay Special Attention! True or False. When the RF pulse is turned off, hydrogen protons rapidly return to their natural alignment within the magnetic fieldand release their excess stored energy and this process is known as demagnetization 

The force exerted by a magnetic field on a moving electrical charge is the definition of a ______________.

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

Which MRI sequences are widely considered the loudest in a 1.5T magnetic field? 

As voxel size increases, acoustic noise will  ______________________.

True or False. Permanent Threshold Shift (PTS) may be caused by single event over 120 dB or repeated or continuous exposures causing TTS.