MRA imaging Flashcards

1
Q

An aortic arch root aneurysm is located:

A

In the ascending segment of the thoracic aorta

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2
Q

The common carotid artery bifurcates into the internal and external carotid artery at the level of the:

A

: C3-4 disc space

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3
Q

In order to acquire an intracranial venogram, a MR angiographic sequence would have a presaturation pulse applied in which location?

A

Inferior to slice group

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4
Q

: In order to acquire an intracranial arterial blood flow sequence , a presaturation pulse would be applied in which location?

A

Superior to slice group

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5
Q

Blood flow velocities are greater:

A

At the center of a vessel

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6
Q

The ___________ supplies blood to the anterior brain

A

Internal carotid artery

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7
Q

The __________ supplies blood to the face.

A

External carotid artery

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8
Q

The ___________ supplies blood to the posterior brain

A

Vertebro-basilar artery

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9
Q

The common carotid artery bifurcates into the internal and external carotid at the level of C5-6.

A

False

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10
Q

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?

A

Superior to slice group, superior to brain stem

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11
Q

All of the following arise from the aorta EXCEPT?

A

Right vertebral artery

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12
Q

When utilizing time-of-flight (TOF) MRA to evaluate peripheral vascular flow, such as arterial blood flow in the legs, presaturation pulses are:

A

Positioned inferior to the slice group

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13
Q

An extracranial MRA exam is defined as an MRA of the ____________?

A

Carotid arteries

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14
Q

An intracranial MRA is defined as an MRA of the _______________?

A

Circle of willis

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15
Q

: In time-of-flight (TOF) imaging targeted to the subclavian arteries, the two best imaging planes would be:

A

Axial and sagittal

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16
Q

A major advantage of a 2D time of flight over a 3D time of flight sequence is the ability to:

A

Image larger areas without saturation of flowing blood

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17
Q

A major advantage of a 3D time of flight over a 2D time of flight sequence is the ability to:

A

Visualize smaller vessels

18
Q

A 2D TOF MRA sequence would be selected to cover

A

A large area of vascular coverage

19
Q

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:

A

Out of phase

20
Q

MR angiography uses which kind of pulse sequence?

A

Gradient echo

21
Q

The degree of stenosis ___________ with time-of-flight MRA.

A

May be overestimated

22
Q

The __________ of blood is responsible for the bright blood signal in time of flight MR angiography.

23
Q

Phase contrast MRA techniques produce images in which the signal intensity within the vessel is dependent upon the:

A

Velocity of the flowing blood

24
Q

Contrast enhanced MRA differs from TOF (time of flight) MRA because:

A

All of the above

25
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
26
What is the second branch of the abdominal aorta?
Superior mesenteric artery
27
The first major branch of the abdominal aorta is the \_\_\_\_\_\_\_.
Celiac artery
28
In a contrast enhanced MR angiography of the abdominal arteries, the IV gadolinium would enhance in which order?
Celiac, superior mesenteric, renal, inferior mesenteric
29
The common iliac veins join to form the:
Inferior vena cava
30
In order to obtain a time of flight MRA of the IVC a presaturation band would be placed:
Superior
31
To create a projection image in MRA, the technique most commonly used is:
MIP
32
\_\_\_\_\_\_\_\_ is defined as an abnormal connection between arteries and veins, usually congenital.
: An AVM
33
The major bifurcation of the abdominal aorta is the
Right and left iliac arteries
34
The vertebral arteries originate from the
Right and left subclavian arteries
35
The optimal technique to visualize the circle of willis would be:
3D TOF
36
When imaging a geriatric patient, while performing a PCA MRA sequence, what imaging parameter might the operator adjust?
VENC
37
Flow before an area of stenosis is defined as
Laminar flow
38
: 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
39
A disease that is characterized by narrowing of the aorta is called an \_\_\_\_\_\_\_\_\_\_\_\_\_.
Aortic coarctation
40
The MRA technique that relies on velocity induced phase shifts to distinguish between moving and stationary protons is:
: Phase contrast