Description

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 ________?

1 Gauss
5 Gauss
1.5 Gauss
3 Telsa

14.) Policies in MRI are developed based on which of the following:

FDA guidlines
Manufacturers testing and recommendations
MRI ACR White Paper
All of the above

15.) When an MRI System is designed with active shimming:

metal objects are safe to enter zone IV
there is no longer a fringe field
the fringe field that exists is minimized
none of the answers provided are correct

16.)

  1. The distance that the 5 gauss line extends from isocenter is:is located 5 feet in all directions depends only on the main magnetic field stregnthis dependent on the magnetic field strength. geometry of the magnet, and type of magnetic shieldingis dependent on the magnetic field strength, type of magnetic shielding and RF power.

17. When should the scan room door to Zone IV be closed shut?

When the system is not in use
When the patient is being scanned
When the technologist is preparing the patient in zone IV to be scanned
All of the above

18.) The ACR recommends MRI safety training for:

All hospital employees who have access to zone III, incluiding anesthesiologists, nurses, and environmental staff
Radiology and MRI personnel only, such as technologists and front desk staff
MRI technologists and radiologists only
MRI technologists only

19.) The ACR recommends MRI safety training for:

All hospital employees who have access to zone III, incluiding anesthesiologists, nurses, and environmental staff
Radiology and MRI personnel only, such as technologists and front desk staff
MRI technologists and radiologists only
MRI technologists only

20.) The loud repetitious acoustic noise is:

the result of the Lorentz forces that act on the applied gradients coils in the presence of the static magnetic field.
activated by the RF pulses switching on and off.
the noise that hydrogen makes as it is tipped into the transverse plane
none of the answers provided is correct

21.) The spacial gradient magnetic field is responsible for:

image slice selection
increasing signal to noise
translational attraction (force)
all of the above

22.)

  1. Which component is likely responsible for patient burns in MRIThe spacial graidentThe transmit RFThe RF receiverNone of the answers provided is correct



23.) Select any two of the True or False questions that you answered as FALSE.

List the question # and then explain why you believe the statement is falsey, and provide information that would make the answer true. Be specific.

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