M. MRI PHYSICS Flashcards
% of undiagnosed disc lesions with recumbent conventional MRI?
Best solution?
MRI advantages over CT?
What to put next to spine in a MRI study of that region?
Contraindications MRI?
- Claustrophobia
- Older aneurysmal clips; pacemaker (the news are non ferromagnetic)
- Some neurostimulators / cochlear implants
- Insulin pumps
- Metal objects within the eye / near the spinal cord
How are images created in MRI?
What is the meaning of ressonance?
Movement of the protons is variable?
And depends on what?
Whats happens when the MRI magnet stops the radiofrequency?
Explain the signal in T1?
Explain the signal in T2?
What is LOW T1 / LOW T2?
What is LOW T1 / HIGH T2?
What is HIGH T1 / LOW T2?
What is HIGH T1 / HIGH T2?
How`s the signal difference between discs and bone marrow?
Disc: Iso T1 / Iso T2
Bone Marrow has fat: High T1 / Low T2
MRI image is the result 2 factors. Which?
Places where u have a minimal ammount of hydrogen protons?
How does the hidrogen in the blood vessels behave?
What is black in all the sequences of MRI?
What type of technique is MR Angiography?
What is MR Myelography?
What`s the biggest difference for conventional mielography?
Whats is the meaning of:
- Directed motion?
- Brownian motion?
- Diffusion?
- Diffusion coefficient?
Diffusion measures the movement of what? What limits that motion?
Why the diffusion coefficient is called apparent dif. coefficient?
What types of combinations can u have between DWI / ADC map??
