1.) In your own words, define the static magnetic field and describe the danger associated with B(o) related to the translational gradient magnetic field.
Provide an example that illustrates the danger of the static magnetic field.
Be specific in your answer.
2.) Discuss in detail “active” and “passive” shielding.
Describe what each type of shielding is able to achieve.
Describe the concerns and safety issues related to each type of shielding.
3.) What is the B(1) field in clinical MRI?
List and describe 2 safety concern is related to the B(1) field in clinical MRI.
4.) You stop a nurse who is about to enter zone IV with a pair of Kelly clamps that she has forgotten to remove from her pocket.
- List and discuss the two forces the ferrous Kelly clamps will be exposed to in zone IV
- Discuss what would occur if the nurse entered the room with this ferrous item in her pocket
5.) In your own words, define the MR Time-varying Gradient System. List and describe two dangers associated with the MRI Gradient System.
6.) List 3 different types of metalmaterials that are MRI conditional and may be brought into the room – what are these objects made of?
List any 3 types of metal objects that are known to be MRI unsafe – what are these objects composed of that makes them MRI unsafe?
List any 3 items that may or may not be MRI unsafe? Describe the best practices for managing these types of metal in the MRI suite
7.) List and describe each of the zones of sequential screening and access control as outlined by the American College of Radiology (ACR) in the White Paper on MRI Safety
In your answer please describe who and what is allowed in each zone as well as the significance of the 5 gauss line.
8.) The static magnetic field is always on, even when the scanner is not being used for imaging. True or Falese
9.) In addition to the magnetic moments becoming aligned parallel to the external static magnetic field they are also precessing, which is similar to the spinning of a gyroscope. True or false
10.) The potential for nerve stimulation from the X, Y, Z gradients is greatest at iso-center. True or False
11.) MRI safety experts recommend the use of “ferromagnetic-only” detectors designed especially for MRI use to replace the current way of screening patients and non-MRI personnel with the MRI safety-screening checklist.
12.) 1.5 Tesla MR system is nearly as strong as the earth’s magnetic field. True or false
13.) The MRI exclusion zone for materials that have a ferrous component and are MRI unsafe is the ________?