Exam (elaborations)
MRSO - STATIC FIELD - MODULE 2 EXAM
- Course
- Institution
MRSO - STATIC FIELD - MODULE 2 EXAM ...
[Show more]
Seller
Follow
Content preview
MRSO - STATIC FIELD - MODULE 2 EXAM2024-2025
Static field metrics: ANSWER 1T = 10,000G
(0.5mT = 5G)
Who produced guidelines named "Criteria for Significant Risk" that define what
constitutes a significant risk of exposure to magnetic fields linked with MRI? -
Response from FDA
According to FDA standards, exposure to a static field that does not pose a major
risk is limited to 8T for people and infants older than one month.
Limited to 4T for newborns under 1 month.
Forces associated to static field - ANSWER: Torque/rotation.
-Translation/Displacement
-Lenz
ANSWER: Magnetic saturation The point at which an increase in magnetic force
creates no more magnetic effect in a magnetic substance.
Magnetic saturation depends on: - ANSWER - material
-Size and Shape
-temperature
, Most ferromagnetic objects will saturate at: - ANSWER: 0.3T -2.2T
Torque is the force applied on an elongated ferromagnetic object so that it aligns
with the direction of the magnetic field.
In a horizontal field magnet, torque causes an item to align along the
_____________ axis. - ANSWER Z
In a vertical field magnet, torque causes an item to align along the _____________
axis. - Answer y.
Torque depends on: - ANSWER - length (longer=greater).
- Shape (elongated>sperical)
- Texture (soft, flexible, or firm) (leads, wires, plate)
-location in magnet (largest at the isocenter).
Torque is greater at the ANSWER isocenter.
Translational or displacement (rocket effect) - ANSWER attracting force on a
ferromagnetic item in a spatial gradient magnetic field
The translational force increases as the field change over distance increases
(dB/dx).
The spatial gradient magnetic fields are given as T/m or G/cm.
(1 T/m equals 100 G/cm)
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 Humat. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.89. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79789 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now