Stony Brook University Scan Center - MRI Safety Quiz

Routine communication between you and your subject is very important so they know you can hear them if an emergency should arise. The emergency stop button and quench button should only be pressed is a life threatening emergency.

Implants and objects that are cleared for a 1.5T machine does not mean they are cleared for a 3T machine since it is twice the strength. Also some radiological exams resemble the MRI scanner, for example many times patients confuse MRI with CT.

The magnet is always on 24hrs/7days unless a quench has been initiated.

If a quench occurs, everyone must be removed from the room immediately. The vapors and gases are very cold and can cause frost-bite. They also often condense the moisture in air, creating a highly visible fog that can replace oxygen in the room.

If a quench occurs, everyone must be removed from the room immediately. The vapors and gases are very cold and can cause frostbite. They also often condense the moisture in air, creating a highly visible fog that can replace oxygen in the room.

All magnets have a fringe field that extends from the center of the magnet. Rooms are shielded as much as possible to contain this field but only people who have been cleared by the SCAN Center should be allowed in the controlled access areas of the center.

MR scanners are super cooled with inert gases such as helium. A quench is the rapid boiling off of these cryogens intentionally or unintentionally.

Because the scanner's magnetic field is always on anyone who steps into the scanning room must be cleared by the SCAN Center's staff. Clearance forms can be found on our web site http://www.psychology.sunysb.edu/scancenter/. Anyone who has not been cleared should stay out of the controlled access areas marked by warning signs.

Should a condition exist where the patient is having a medical emergency, every effort should be made to remove the patient from the scan room. Once the patient is removed from the MR scan room, close the door to prevent re-entry. If you cannot remove the patient remember the magnet is always on. Under no circumstances should anyone be allowed to enter the scan room without proper screening!

You must check each subject for contra-indications they might have before allowing them into the scan room. Once the patient is on the table it is very important you get them as comfortable as possible. The MR scanner can produce very high acoustic noise levels that can cause discomfort. Before you start your protocol make sure you open the lines of communication so the patient knows you can hear them in case of an emergency.

The magnetic field can seriously damage or impair the following personal items:
Cameras, watches, credit and bank cards, hearing aids, hair accessories, belt buckles, shoes and I-pods just to name a few. Please remember to empty ALL of your pockets before entering the scanning room.

A female subject needs to be 100% sure they are NOT pregnant to be scanned at the center.

The magnetic field can extend many feet from the inner bore of the magnet. Rooms are shielded to contain the field as much as possible. Remember the magnet is always on even when a scan is not initiated. The main magnetic field of a 3T system is 60,000 times the earth's magnet field. We must also limit the items that go into the scan room to non-ferrous metals.

Since there have been documented cases of tattoos burning the skin you must let them know there is a small chance of this. At that time they can back out of the study if they want. If they do feel a strange sensation during the scan have them squeeze the emergency ball as soon as possible and apply a cold compress to the area. The study is complete at this time.

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The SCAN center has a .7T hand held magnet you can use to check the magnetic susceptibility of an object. If you still have questions please ask the MRI technologist to assist you. The SCAN Center staff has final say on what may or may not be brought into the scanning environment.

The following items can NEVER be allowed into the scanning room:
cardiac pacemakers, cochlear (inner ear) implants, ferromagnetic or unidentifiable aneurysm clips of the brain, implanted neuro stimulators, metal or unidentifiable foreign bodies in the eyes, and implanted pumps to deliver medicine that cannot be removed.
If a subject works around metal and cannot say for sure they have never had any metal in their eyes the study should be canceled.

It is important to use the remote to turn off the lights when turning off the projector because it ensures that the proper sequence of shutting down the equipment is followed. By waiting for 2-5 minutes for the fan to cool down the lamp before shutting off the main power, it allows the lamp to cool down gradually, preventing any potential damage to the projector. Therefore, the statement is true.

The correct answer is to make a note of the abnormal growth for the technologist to have it reviewed as an incidental finding, without informing the subject. As a non-physician, it is not the responsibility to immediately inform the subject or take any action. The abnormal growth should be properly evaluated by a medical professional before any conclusions or actions are taken.

Dissipation of the absorbed RF energy is described in terms of Specific Absorption Rate (SAR), measured in watts/kg. SAR is calculated by the patient’s weight and the expected increase in body temperature for each imaging pulse sequence. The scanner will calculate how much heat the patient will be absorbed if it is too high the scan will not run.

Shutting power to the PDU may be required for life threatening situations such as:
Fire in the computer room, fire, sparks, loud noises emanating from the scan room, flooding or sprinkling system goes off, and catastrophic equipment failure. These reasons should be life threatening. It is important to remember that pressing the emergency stop button shuts the power to the scanner to but the magnetic field is still active.

The MRI scanner produces very high acoustic noise, which can reach excess of 130 DbA. Everyone who is scanned must wear both ear plugs and headset during the exam.

To assign a scan number, you will need the last scan number and then add one to it. Additionally, you will need the PI's initials and the last volunteer number. Therefore, all of the above options are required to assign a scan number accurately.

Heat deposition and nerve stimulation are hazards of a varying magnetic field.

Unless your research patient can say for certain they are not pregnant they cannot go into the scanner until they know for sure that they are not pregnant. If a research subject is pregnant the exam must be canceled regardless of trimester.

When a patient crosses their legs or intertwines their fingers a circuit is formed and it is more likely to cause peripheral nerve stimulation.

The glasses are located in bottom left most cabinet

Translation describes the force that attracts ferrous objects to the center of the magnetic field. It is sometimes referred to as the projectile effect. Rotation is the term that relates to the force of the North and South poles and the orientation of the scanner’s magnetic field. Ferrous objects will attempt to align their long axes with this orientation and will rotate until they are aligned with the magnetic field.

The correct answer suggests that the user should close the subject, go to the system-end session-system shut down, and wait for the scanner to indicate when to switch off the power. This implies that there is a specific process or sequence that needs to be followed in order to safely turn off the scanner. Simply pressing the system off button or turning off the scanner immediately is not recommended. The user should wait for the scanner to give instructions before switching off the power.

Small items like paper clips or hair pins can have a velocity of about 40mph in a 3T environment. Larger objects have even higher velocities and have become fatal. Many types of clinical equipment are ferromagnetic and should never be brought into the scan room. If there is any question a handheld magnet can be used to test if an object is ferromagnetic or not.

A 3T magnet is double the strength of a 1.5T unit. It is important to remember that objects that are clear for a 1.5T magnet cannot go into a 3T magnet. Mrisafety.com has the largest database of items that are cleared for the 3T environment.

We have a Siemens 3T Trio Scanner. 3T machines are double the strength of 1.5T machines. It is important to remember that if an object/implant has been cleared for a 1.5T machine it does not mean it is ok for a 3T machine. Further research must be done.

Magnetic fields are measured in units of Gauss or Tesla (1T = 10,000G).

Some examples of items that can become projectiles are: Scissors, hair clips and bobby pins, tools, paperclips and clapboards.

The correct answer is Option1. This suggests that out of the given options, Option1 is the preferred choice or the one that is most liked.

An intentional quench is done in an emergency to run the magnetic field to zero. This is done in extreme emergencies only (ex- a projectile that is pinning a patient against the magnet, injuring them).

Vitamin should be on RIGHT side of head

KPACS is the SCAN Center server, this is the correct answer. PACS is the hospital server, only clinical studies go there.

The given answer suggests that the format for scan numbers includes the scan number, subject number, and investigator's initials. This format is likely used to identify and organize scans in a research or medical setting. The inclusion of the subject number helps to differentiate between different individuals or cases, while the investigator's initials provide information about the person responsible for the scan.

Before going into the scanning room, certain items must be removed for security reasons. These include scissors, as they can be considered a potential weapon. Wallets should also be removed to ensure that they do not interfere with the scanning process or cause any confusion. Hair pins should be taken out as they can set off metal detectors or cause discomfort during the scan. Watches should be removed to avoid any interference with the scanning equipment.