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MRI facts for Nurses
Transcript of MRI facts for Nurses
Your Time !!!
What is MRI Anyhow???
is a "SOFT TISSUE" imaging modality...
X-RAY utilizes radiation to
acquire images of bone and
certain soft tissues.
MRI utilizes tiny magnetic
fields produced by hydrogen
atoms within water molecules.
NO RADIATION !!!
The human body contains countless hydrogen protons
This allows MRI to image
a wide variety of body tissues...
MRI is extremely useful
in imaging structures
So now you are probably
What does this have to do with me?
I don't work in the MRI department !!!
MRI is abundant in healthcare and you
will most likely work around one at some point!!!
You may also wonder...
Why do MRI Techs call to make sure patients
are screened and monitors have been removed???
THERE ARE REASONS FOR THIS!!!
AS AN MRI TECH
I feel it is important to
educate you on the risks and dangers involved in
working with the powerful magnetic fields that
our scanners generate...
THAT'S WHY I'M HERE TODAY !!!
(YAY FOR YOU)
Take some wire, wrap it around an iron
core, add current...
and you are now a genius !!!
Most MRI's are
Made super easy...
OCCURS WHEN CERTAIN
METALS ARE COOLED TO NEAR ABSOLUTE ZERO.
AT THESE TEMPERATURES THEY HAVE NO ELECTRICAL RESISTANCE. ELECTRONS CAN FLOW THROUGH THESE METALS WITHOUT EVER BEING STOPPED.
THESE COLD METALS CAN CARRY HUGE CURRENTS
FOR LONG PERIODS OF TIME WITHOUT LOSING ENERGY!!
Our magnet uses the same idea as the simple electromagnet,
but uses 1000's of loops in the wire. It is then supercooled
with liquid helium. A massive amount of current is then applied, which travels through the loops virtually FOREVER.
It's like golfing in space !!!
With no resistance, the golf ball will travel forever !!!
Many loops of wire coupled with
massive current in a helium bath
A VERY STRONG MAGNET !!!
Our magnet is rated at 1.5 TESLA.
1 TESLA is 10,000 GAUSS.
A fridge magnet is around 5 GAUSS.
So remembering that current is running through
this magnet indefinitely, we now know that the
The risk of magnetic items becoming high velocity
projectiles is ever present !!!
This is not good...
We have to be careful !!!
The more mass an object has, the greater the pull.
Larger objects will experience pull from farther away.
In order to remove an object, the magnet may have to be
is when an MRI magnet loses its liquid helium.
This can either be controlled (good), or accidental (all kinds of bad).
Accidental quenching can be very dangerous with risks of suffocation
The cost to restart a magnet can be up to $100,000.
The rapid heating of magnet coils can break them rendering the magnet
Some metals are "magnet friendly".
They are known as NON FERROUS
Most devices that are implanted in
the body are made from high grade
metals which are non ferrous.
When these metals are placed
in the magnet, they cause a
disturbance in the magnetic field.
This in turn causes artifacts in
the resulting images.
The pix look bad!!!
So how do we keep people
safe in this thing ???
WE USE A SCREENING
Everyone must fill out an MRI SCREENING
FORM prior to entering the scan room.
This form ensures the person has no
contraindications to being in a strong magnetic
field. These include:
Metal in the eyes
The form also helps us in finding out if a patient is claustrophobic so we can
aide them in getting their exam done.
Lets sum this up so far...
Our magnet is a SUPERCONDUCTING MAGNET rated at 1.5 TESLA.
CRAZY STRONG !!!
The magnet is
ALWAYS ON !!!
SERIOUSLY... Its never off... EVER.
Metallic objects can and will become
dangerous projectiles in the MRI room.
The larger the object, the stronger the force exerted on it by the magnet.
In order to remove an object, a QUENCH
may be necessary.
MEGA EXPENSIVE DANGEROUS STUFF !!!
Not all metals are affected by the
But they still make our
pictures look bad !!!
EVERYONE must be screened
prior to entering the magnet
So all of you nurses...
Remember the magnet is ALWAYS on!!!
Before sending a patient our way, remove anything that can become a dangerous projectile.
Make sure your patient has filled out an MRI SCREENING FORM.
Never enter the scan room without approval of a tech, even in the event of a CODE BLUE !!!
If you have any questions, don't hesitate to ask an MRI TECH.
JUST NOT THIS ONE...
WAKE UP !!!
IT'S FINALLY OVER !!!
So what happens when these objects
make it into the scan room ???
SCREENED.......get it ???
Let's check out a few pictures...