Risks Associated w/ Static Magnetic Field - Answer -translational force (missile effect)
-shielding
-maximum spatial gradient/force product
Translational Force (Missile Effect) - Answer -magnetic spatial gradient
-an object will experience different magnetic fields and therefore be attracted to...
Risks Associated w/ Static Magnetic Field - Answer -translational force (missile effect)
-shielding
-maximum spatial gradient/force product
Translational Force (Missile Effect) - Answer -magnetic spatial gradient
-an object will experience different magnetic fields and therefore be attracted to the MR
unit
-if it doesn't experience multiple fields at once, it will not translate through the
magnetic field
-object will not demonstrate any attraction at isocenter
Shielding - Answer -Active Shielding vs Passive Shielding
-active shielding uses a coil of wire with a current running opposite direction to the
static magnetic field
-passive shielding use magnetically conductive material to shape the state magnetic
field
Maximum Spatial Gradient/Force Product - Answer -total magnetic force of an MR unit
-dB/dx+-B
-T2/m or G2/cm
Deflection - Answer -the amount of degrees that an implant is attracted to the MR unit
-translational force vs gravity
,Rotational Force - Answer -when a ferrous object aligns itself to the magnetic flux lines
of the static magnetic field
-can cause torquing of ferrous implants within a patient
-can cause ferrous objects off the side of a MR unit to be attracted towards isocenter
-isocenter will demonstrate the largest amount of rotational force
Len'z Forces - Answer -electrically conductive material can demonstrate opposing
magnetic fields when moving/translating through a static magnetic field
-an exam should never be cancelled because of the change of Len'z force being placed
on an implant
-the amount of opposing force is proportional to the amount of current generated in the
conductive material
-moving the patient slower through the spatial magnetic gradient, less opposing force
will be induced in the electrically conductive material
Magnetohydrodynamic Effect - Answer -due to the flow potential of blood through
vessels in patients, iron as well as other minerals, electric field can disturb the ECG
cycles of a patient
Magnetophosphenes - Answer -due to Faraday's Law of Induction, as a patient moves
through a spatial magnetic gradient, electrical current can be produced in and around
the eye
, -demonstrated as visually seeing flashing lights
Vertigo, Dizziness, Nystagus, Nausea - Answer -due to Faraday's Law of Induction,
headaches, vertigo, dizziness, nystagmus, and nausea can occur
Teratogenesis - Answer -these describe the effects of the static magnetic field on future
offspring
-no evidence that describe any effect on offspring
Pregnancy - Answer -no evidence to suggest that the static magnetic field is responsible
for causing any issues in unborn fetus at any stage of pregnancy
Magnetic Susceptibility - Answer -describes the amount of magnetism an object will
demonstrate in the presence of a magnetic field
-diamagnetic
-paramagnetic
-ferromagnetic
Ferromagnetism - Answer -has a strong attractive magnetism
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Examsplug. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
