40 Questions
What is the maximum SAR that can be used for MRI scans of coronary artery stents?
2 W/kg
What is the maximum magnetic field strength that can be used to scan commercially available coronary artery stents?
3.0 Tesla
What is the minimum wall thickness of the pipe material?
3 mm
What is the minimum distance from the finished wall to the centerline of the toilet on both sides when a regular toilet is used?
44 inches (1.12 meters
What must MRI suites with a static magnetic field of 5 gauss (0.5 millitesla) meet in order to be compliant?
The four-zone screening and access control protocols identified in the current edition of the American College of Radiology’s “ACR Manual on MR Safety.”
What should be avoided when removing conventional doors and frames to facilitate delivery/removal of MRI scanners?
Demolition of partitions
What must be done to areas in which the magnetic field strength is equal to or greater than 5 gauss (0.5 millitesla)?
Physically restrict by the use of key locks or pass-key locking systems
What should the operator's console be positioned so that they can see?
The entrance to the MRI scanner room
What is the minimum distance between the outlet and any restriction such as the roof or wall?
100 cm
What is required to restrict the magnetic field plot?
Magnetic shielding
Which of the following is a requirement for MRI scanning of coronary artery stents?
Obtaining prior approval from a Radiologist
What is the minimum clear floor area that should extend from the front of the toilet?
46 inches (1.17 meters
What is the minimum SAR required for MRI examination of coronary artery stents?
2.0 W/kg
What should be located outside the MRI scanner room?
The entry vestibule
What must be provided in the MRI suite, in addition to the clinical and support areas?
All of the above
What is the required magnetic field strength of an MRI scanner device?
5 gauss
What is the purpose of IEC Standard 60601-2-33?
To prevent unscreened individuals from entering the 5-gauss (0.5-millitesla) volume
What should be considered during design?
Delivery and removal of an MRI scanner
What is the concentrated load capacity of the grab bars in toilet rooms intended for use by individuals of size?
800 pounds (362.87 kilograms
What should be taken into consideration when locating the MRI unit?
The quantity and distance of structural steel
What type of material should be used to cover the opening of the quench vent pipe?
Wire mesh
What is the minimum time required for each MRI sequence when examining coronary artery stents?
15 minutes
When can coronary artery stents be scanned using MRI?
Immediately after placement
What is the minimum clearance from air intakes, operable windows, or doors as defined by the MRI system manufacturer for the cryogen venting point?
5 gauss (0.5 millitesla
What type of prior approval is required when deviating from the parameters specified for MRI examination of coronary artery stents?
Radiologist approval
What is the minimum distance the vent pipe should be from walking surfaces?
5 m
What is the minimum clear widths for door openings to toilet rooms designated for individuals of size?
36 inches (91.44 centimeters
What must be provided in the MRI suite, in addition to the cryogen venting point?
A system component room that meets the requirements in Section 2.1-3.5.2.5
What type of signage should be included in the electrical details of the MRI room?
A sign indicating the magnet is always on
What should be avoided near an MRI scanner?
Structural steel
What is the minimum MRI system that can be used to scan coronary artery stents?
1.5 Tesla
What is the purpose of cryogen vent pipes?
To be clearly marked and shielded from staff and maintenance areas
What type of seating should be provided in waiting areas in outpatient facilities for individuals of size?
Expanded-capacity seating
What should be considered when locating an MRI unit?
The location, quantity, and distance of structural steel
What is the minimum area of the end of the opening?
2.5 times the cross section area of the quench line
What is required for the use of anesthesia support in the MRI scanner room?
All of the above
Which of the following is not a requirement for MRI scanning of coronary artery stents?
Using an MRI system with 4 Tesla
What should the wall, floor, and ceiling assemblies accommodate?
The installation of RF-shielded assemblies
Does the information provided in the text apply to other types of stents?
No
What type of access control must be used for any area in which the magnetic field strength is equal to or greater than 5 gauss (0.5 millitesla)?
Pass-key locking systems
Study Notes
- All current, commercially available coronary artery stents can be scanned using MRI at either 1.5 or 3 Tesla.
- Immediately after placement, patients with coronary artery stents can undergo MRI.
- The MRI examination must be performed using the following parameters: 1.5 or 3 Tesla, only, with a SAR of 2 W/kg, and using the Normal Operating Mode of operation for the MR system.
- Any deviation from the above MRI conditions requires prior approval by the Radiologist.
Test your knowledge on MRI scanning for patients with coronary artery stents, including the required parameters and conditions for the examination.
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