MRA Imaging Flashcards
What time of pulse sequence does MR Angiography utilize?
gradient echo pulse sequence
TOF stands for?
time of flight
TOF MRA sequences use T1s or T2?
T1s with TR and flip angle
This suppresses the signal from stationary tissues, visualizing blood flow by flow -related enhancement
Phase Contrast MRA uses T1s or T2?
T2 that relies on velocity-induced phase shifts for vascular signal.
Blood velocities are GREATER at the _____ of the vessel.
Near the wall OR the center
center :)
What is an arterio-venous malformation? What is the abbreviation for this?
AVM- it is an abnormal connection between arteries and veins, that’s usually formed before birth.
What is the difference between laminar flow and vortex flow??
LAMINAR is flow that is different but consistent velocities
VORTEX is initially laminar but when it comes across a stenosis, it has HIGH velocities at the center of vessel and spiral flow at the walls.
What is turbulent flow?
Blood flow that has different velocities that fluctuate randomly (random flow)
If I am looking at a LARGE area, would I do TOF MRA or 3D TOF MRA?
TOF, those are used for larger coverage areas. We use thicker slices on these.
The vertebral artery supplies blood to what part of the brain ?
Anterior, posterior, or lateral?
posterior!!
think about that your vertebraes are in your BACK
Your ECA (external carotid artery) feeds what part of your body??
The face or the brain?
FACE
a head MRA is considered a _______ MRA exam
intracranial or extracranial?
intracranial- its looking at the BRAIN.
a neck MRA is considered a _______ MRA exam
intracranial or extracranial?
extracranial, even tho the carotids are feeding your brain, they are not necessarily IN your brain.
If I have a super small vessel I want to look at, would I use TOF MRA or 3D TOF MRA?
3DTOF - SMALLER VESSELS!!
uses thin slices.
your ICA (internal carotid artery) feeds what part of your body?
face or brain?
BRAIN.
I always remember it this way. my BRAIN is super IMPORTANT.
If a vessel has SLOW flow, what is the best type of imaging to use to detect flow?
phase contrast MRA.
What is the most longest type of MRA we have?
phase contrast MRA.
the right common carotid does NOT originate directly off the aorta
True or False
True. it does NOT branch directly off the aorta
If I’d like to image the circle of willis (MRA HEAD), what type of technique would be best? and why?
3D Time of Flight (TOF)
This is because 3D TOF is the best for imaging smaler vessels like the circle of willis.
The left and right vertebral arteries originate from the ____ arteries.
subclavian
The right and left vertebrals come together to form what artery?
the midline basilar artery
THE CCA bifuraction is found at what level in the spine?
C3-C4
What is the first major branch of the abdominal aorta?
the celiac trunk then the SMA is second
Branches starting from the first branch of the aorta includes:
Celiac, SMA, renal and IMAs (inferior mesenteric)
The portal vein ____ the liver.
Feeds or drains?
feeds. It gets blood from the spleen and GI tract to feed the liver.
What is the second major branch of the abdominal aorta?
the SMA (superior mesenteric artery)
The PV is formed by the splenic veins and SMA/IMA.
True or False
True
the IVC is formed by the right and left ______ veins
common iliac veins
If we are doing a MRA run off, what anatomy do we need to cover?
from the iliac bifurcation to the dorsal pedis artery (at the anterior portion of the foot)
