MRA imaging Flashcards
An aortic arch root aneurysm is located:
In the ascending segment of the thoracic aorta
The common carotid artery bifurcates into the internal and external carotid artery at the level of the:
: C3-4 disc space
In order to acquire an intracranial venogram, a MR angiographic sequence would have a presaturation pulse applied in which location?
Inferior to slice group
: In order to acquire an intracranial arterial blood flow sequence , a presaturation pulse would be applied in which location?
Superior to slice group
Blood flow velocities are greater:
At the center of a vessel
The ___________ supplies blood to the anterior brain
Internal carotid artery
The __________ supplies blood to the face.
External carotid artery
The ___________ supplies blood to the posterior brain
Vertebro-basilar artery
The common carotid artery bifurcates into the internal and external carotid at the level of C5-6.
False
In order to acquire an extracranial time-of-flight arterial MRA, a presaturation pulse would be applied in which location to saturate unwanted blood flow?
Superior to slice group, superior to brain stem
All of the following arise from the aorta EXCEPT?
Right vertebral artery
When utilizing time-of-flight (TOF) MRA to evaluate peripheral vascular flow, such as arterial blood flow in the legs, presaturation pulses are:
Positioned inferior to the slice group
An extracranial MRA exam is defined as an MRA of the ____________?
Carotid arteries
An intracranial MRA is defined as an MRA of the _______________?
Circle of willis
: In time-of-flight (TOF) imaging targeted to the subclavian arteries, the two best imaging planes would be:
Axial and sagittal
A major advantage of a 2D time of flight over a 3D time of flight sequence is the ability to:
Image larger areas without saturation of flowing blood
A major advantage of a 3D time of flight over a 2D time of flight sequence is the ability to:
Visualize smaller vessels
A 2D TOF MRA sequence would be selected to cover
A large area of vascular coverage
A disadvantage of TOF MRA is high signal in some background tissues. To minimize signal from background tissues, TE should be selected that enable the signals from fat and water to be:
Out of phase
MR angiography uses which kind of pulse sequence?
Gradient echo
The degree of stenosis ___________ with time-of-flight MRA.
May be overestimated
The __________ of blood is responsible for the bright blood signal in time of flight MR angiography.
Flow
Phase contrast MRA techniques produce images in which the signal intensity within the vessel is dependent upon the:
Velocity of the flowing blood
Contrast enhanced MRA differs from TOF (time of flight) MRA because:
All of the above
Which of the following MR angiography techniques has a scan time short enough to complete an abdominal study in a single breath hold?
Contrast enhanced
What is the second branch of the abdominal aorta?
Superior mesenteric artery
The first major branch of the abdominal aorta is the _______.
Celiac artery
In a contrast enhanced MR angiography of the abdominal arteries, the IV gadolinium would enhance in which order?
Celiac, superior mesenteric, renal, inferior mesenteric
The common iliac veins join to form the:
Inferior vena cava
In order to obtain a time of flight MRA of the IVC a presaturation band would be placed:
Superior
To create a projection image in MRA, the technique most commonly used is:
MIP
________ is defined as an abnormal connection between arteries and veins, usually congenital.
: An AVM
The major bifurcation of the abdominal aorta is the
Right and left iliac arteries
The vertebral arteries originate from the
Right and left subclavian arteries
The optimal technique to visualize the circle of willis would be:
3D TOF
When imaging a geriatric patient, while performing a PCA MRA sequence, what imaging parameter might the operator adjust?
VENC
Flow before an area of stenosis is defined as
Laminar flow
: In time-of-flight (TOF) imaging, areas of signal void can be seen on the image due to:
I. Turbulent flow
II. Vortex flow
III. Laminar flow
: I and II only
A disease that is characterized by narrowing of the aorta is called an _____________.
Aortic coarctation
The MRA technique that relies on velocity induced phase shifts to distinguish between moving and stationary protons is:
: Phase contrast
