Equipment Safety and labeling

The FDA safety levels for RF exposure during MRI examination are defined as SAR restrictions, which are imposed to reduce the risk of

systemic and/or thermal injury to patient

FDA guidelines dictate a level of concern when RF energy absorption produces an increase in body temperature of

1 degree Celsius

The FDA recommends posting warning signs to indicate the _ line

5 Gauss

ACR recommended Zone 3 signage designates an area intended for:

screened MRI patients/personnel

ACR recommended Zone 4 signage designates an area intended for:

screened MRI patients under constat direct supervision of trained MR personnel

ACR recommended Zone 1 signage designates an area intended for:

general pubic

The magnetic field that the MR tech is most exposed to would be the:

static magnetic field

The fringe magnetic field can

cause Nerby medical devices to malfunction

what type of pulse sequence transmits the most RF to the pt and consequently can potentially have more SAR restrictions?

FSE

Which of the following is regulated by the FDA

acoustic noise

The intensity limit for a static magnetic field in clinical use is limited by the FDA to what field strength? (Clinical imaging in pts over 1 month of age and above)

8 Tesla

Risk factors of MR exposure with regards to SAR include all of the following expect

• cardiovascular disease

• hypotension

• obesity

• geriatric patients

hypotension

RF energy is

low energy, non-ionizing radiation

The intensity limit for a static magnetic field by the FDA for the entire population is?

4 Tesla

ACR recommended Zone 2 signage designates an area intended for:

unscreened MRI patients