Summary
Summary Biomedical Imaging (minor)
- Course
- Institution
Extensive summary of the minor Biomedical Imaging (186 pages)
[Show more]
Seller
Follow
Lyanman
Reviews received
Content preview
Basic principles MRHow does MRI works (physics):
1. Give energy to the system → excite proton spin
2. Turn off the source of energy
3. Observe the energy you get back thanks to entropy (rate of relaxtion)
Differences in relaxation = contrast
Rules:
Rule 1: Only magnetization in the transverse plane is measured
Rule 2: Rotation frequency scales linearly with local magnetic field strength
Rule 3: Relaxation processes determine contrast
Rule 4: Spatial localization based on spatial variation of magnetic field strength
, Rule 1: Only magnetization in the transverse plane is measured
The Z-axis is the direction of the magnetic field = Longitudinal magnetization
Magnetization will always return to Z-direction, when you wait a few second → equilibrium.
Magnetization in x-y plane = transverse magnetization (this is what will be measured)!
Water molecules will exhibit a net magnetization (M0) (= netto)
The main magnetic field direction:
Rule 2: Rotation frequency scales linearly with local magnetic field strength
Tesla (unit of magnetic field strength)
3 Tesla staat gelijk aan 128 Mhz (main field strength for clinical scanners)
7 Tesla staat gelijk aan 300 Mhz (very advanced research scanners)
Mhz staat voor het aantal rondjes dat de protonen maakt per seconde.
MR parameters of tissue determined by 3 parameters:
T = timing parameter
Proton density: number of protons that are present → more protons = brighter on image
(CSF)
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 Lyanman. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $16.59. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53068 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now