MRI SAFETY EXAM SCORES
Samuel Venezia
98.65%
Oct 12, 2018
Faculty Advisor/ Supervisor:Dr. Jennifer Kubota
| Question | Correct Answer | Samuel’s Answer |
|---|---|---|
| 1. The three types of magnetic fields used in MRI that are of concern in MRI safety are the ______ magnetic fields. | b | b- 1 |
| 2. The primary hazard associated with the static magnetic field in the MRI environment is: | a | a- 1 |
| 3. The maximum static magnetic field strength allowed for clinical imaging in the U.S. as defined by the FDA is _____ Tesla. | d | b- 1 |
| 4. The potential dangers associated with metallic implants in the MRI environment are: | b | b- 1 |
| 5. The primary hazard associated with gradient magnetic fields in the MRI environment is | d | c- 1 |
| 6. The term used to describe the amount of RF power absorbed in a unit of tissue in a unit of time is: | c | c- 1 |
| 7. The primary hazard associated with RF in the MRI environment is: | d | d- 1 |
| 8. The primary potential biological response to RF in the MR environment is: | b | b- 1 |
| 9. SAR is measured in: | a | a- 1 |
| 10. A known biological risk associated with the static magnetic field is: | c | c- 1 |
| 11.SAR limits are monitored by the MRI system during an exam using pulse sequence parameters and the patient’s: | b | b- 1 |
| 12. The maximum allowed SAR value in the U.S. as defined by the FDA for whole- body MRI imaging is: | d | d- 1 |
| 13. The maximum allowed SAR value in the U.S. as defined by the FDA for head MRI imaging is: | c | c- 1 |
| 14. The primary hazard associated with a superconducting magnet quench is: | a | a- 1 |
| 15. The noise created by the gradients in an MR imager: | d | d- 1 |
| 16. The primary hazard of handling liquid cryogens is: | c | c- 1 |
| 17. The FDA ______ MRI scanning of pregnant patients in the U.S. | d | d- 1 |
| 18. Electrical current can be induced in electrical wires during MRI scanning if the wires are: | b | b- 1 |
| 19. The area around an MRI magnet wherein the static magnetic field is strong enough to interfere with cardiac pacemakers and other medical devices is called the: | a | a- 1 |
| 20. The static magnetic field strength that can interfere with cardiac pacemakers and other implanted medical devices is Gauss or Tesla. | d | d- 1 |
| 21. The most reliable source of MRl safety information about a medical implant is: | c | c- 1 |
| 22. Cardiac pacemaker wires in the heart, but no control module in the patients’ chest is in the MRI environment. | a | a- 1 |
| 23. An implanted drug infusion pump is ______ in the MRI environment. | b | b- 1 |
| 24. If a patient presents to the MRI site with a history of metal slivers in the eyes: | b | b- 1 |
| 25. If a patient presents to the CBBI MRI facility with a history of a bullet or shrapnel wound: | b | b- 1 |
| 26. The danger of exposing a person with a cardiac pacemaker to the MRl environment is: | d | d- 1 |
| 27. The primary danger of exposing a person with an implanted ferromagnetic intracerebral aneurysm clip to the MRI environment is: | a | a- 1 |
| 28. The danger of exposing a person with an internal cardiac defibrillator to the MRI environment is related to the: | d | d- 1 |
| 29. The danger of exposing a person with metal slivers in their eyes to the MRI environment is related to the _____ field(s). | a | a- 1 |
| 30. The danger of exposing a person with retained pacemaker wires (no pulse generator) to the MR environment is related to the ________ field(s). | b | b- 1 |
| 31. The strongest magnetic field used in MRI is the ________ field. | c | c- 1 |
| 32. The three classifications of metals in order of strongest magnetic interaction are: | b | b- 1 |
| 33. The term for the movement of a paramagnetic object by a magnet is: | a | a- 1 |
| 34. The term used to identify the part of the primary magnetic field that extends past the magnetic housing is the ________ field. | c | c- 1 |
| 35. The danger of having ferromagnetic objects in the magnetic field is that they can: | a | a- 1 |
| 36. The area of the body where metallic foreign bodies are most dangerous for MRI are the: | e | e- 1 |
| 37. The area an MRI magnet wherein the magnetic field is strong enough to interfere with medical devices is the: | exclusion zone | b- 1 |
| 38. The only type of MRI main magnet can be switched off when not in use is the _________ magnet. | a | a- 1 |
| 39. The type of MRI main magnet that has the strongest magnetic field is the _______ magnet. | c | c- 1 |
| 40. Patients who have cardiac pacemakers are ________ for MRI. | a | a- 1 |
| 41. Patients who have surgical clips in the chest, abdomen, or pelvis are ________ for MRI. | b | b- 1 |
| 42. Patients who have intravascular coils, filters, and stents are ________ for MRI. | b | b- 1 |
| 43. Patients who have prosthetic heart valves are _______ for MRI. | c | c- 1 |
| 44. Patients who have metal attached to a bone are _______ for MRI. | d | d- 1 |
| 45. Patients who have vascular clips in their brain are _________ for MRI. | c | c- 1 |
| 46. Patients who have internal cardiac defibrillators are ________ for MRI. | a | a- 1 |
| 47. Patients who have internal neurostimulators are __________ for MRI. | a | a- 1 |
| 48. The primary danger associated with secondary magnetic field is: | d | d- 1 |
| 49. The only time a technologist should quench a superconducting magnet is: | b | b- 1 |
| 50. If there is a medical emergency in the magnet room, the first thing an operator should do is: | c | c- 1 |
| 51. If a magnet quenches and the gases are venting into the magnet room with a patient in it, an operator should: | a | a- 1 |
| 52. If a magnet and the gases are venting into the magnet room, any person in the magnet room should: | b | b- 1 |
| 53. The only people who should handle cryogens are: | c | c- 1 |
| 54. In case of a small fire in the magnet room, a technologist should: | d | d- 1 |
| 55. In case of a large fire in the magnet room, an operator should: | d | d- 1 |
| 56. The FDA _______ MRI scanning of pregnant patients in the U.S. | d | d- 1 |
| 57. If a patient presents to the MRI site with an implanted arterial stent: | c | c- 1 |
| 58. If the patient presents to the MRI site with an implanted vena cava filter: | c | c- 1 |
| 59. If a patient presents to the MRI site with a history of a bullet or shrapnel wound: | c | c- 1 |
| 60. The primary danger of exposing a person with an intracerebral aneurysm clip to the MRI environment is: | a | a- 1 |
| 61. A “magnet quench” means: | b | b- 1 |
| 62. The major risk of injury or harm due to magnet quench is: | b | b- 1 |
| 63. The emergency shutdown button (on Siemens magnets) should be used to immediately cut power to the scanner electrical system in each of the following situations EXCEPT: | d | d- 1 |
| 64. Pressing the emergency shutdown button will: | a | a- 1 |
| 65. At the end of an after-hours research scanning session, you should do all of the following EXCEPT: | c | c- 1 |
| 66. All of the following statements about the main magnet of the MRI scanner are true EXCEPT: | d | c- 1 |
| 67. MRI fatalities have been associated with: | b | b- 1 |
| 68. Which of the following objects may be safely taken into the scan room: | a | a- 1 |
| 69. With regard to metal objects in the scan room: | b | c- 0 |
| 70. Patients with which of the following prosthetic devices may be safely scanned: | d | d- 1 |
| 71. The 5 gauss line: | a | a- 1 |
| 72. Which of the following is a likely consequence of forgetting to remove your wallet from your pocket before entering the scan room: | b | b- 1 |
| 73. The following are all contraindications to having an MRI scan EXCEPT: | a | a- 1 |
| 74. The only time a technologist should quench a superconducting magnet is | b | b- 1 |
75. Extended Response
A patient with a known metallic object (can be either surgically placed or fragments from an accident.) comes to MRI for a scan. The patient has successfully undergone multiple MRI exams both at other sites. Can it be assumed that the patient will have no adverse effects from this next scan or any future exams due to the presence of the metallic object? Give a short explanation for your answer.
In the context of a research background, there is an ethical duty to protect participants from unnecessary risks when participating in studies. In this case, the participant may be safe to scan, however, since there is no way to assure this based on there being no adverse effects from past scans. There are several reasons that could explain why there were no adverse effects during their previous scans such as the location they were having scanned (compared to where the metal was) and the strength of the magnet in the scan itself. In the interest of their safety, it would be best to cancel the scan for this participant and reschedule them for a scan once they have documentation from a physician which says that they would be safe to scan.
76. Extended Response
You enter the MRI research facility to find your MRI safety instructor pinned to the magnet by a large oxygen tank (or a chair). What do you do – call 911? Call the service engineer? Do you quench the magnet? (Careful here – he’s a nice person – usually.):
This would be dependent on how exactly he was pinned to the magnet. If he was pinned and there was no reason to believe his life was directly in danger (i.e., large fire in the scan room or he was impaled and bleeding heavily) it would be best to contact a service engineer to try to ramp down the power of the magnet slowly in hopes of freeing him without having to quench. If however, he was impaled, or generally in a position that would mean that his life was in peril if he didn’t receive medical attention as soon as possible, then it would be necessary to quench the magnet, free him and then have emergency personal provide care and get him to a hospital.