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J's extra decks > Final exams > Flashcards

Final exams Flashcards

1
Q

Which of the following studies may be ordered for uncontrollable hypertension?

A

MRA abdomen (renals)

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2
Q

A double IR is a T1 blood-suppressed image resulting in black blood appearance

A

True

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3
Q

Blood flow velocities are greater at the ____ of the vessel:

A

Center

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4
Q

Contrast enhanced MRAs can be acquired with all of the following EXCEPT:

A

VENC

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5
Q

______________ occurs after the R wave is detected.

A

Trigger Delay

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6
Q

Which indicates a contraindication for contrast injection during a renal MRA

  • Brest feeding
  • renal failure
  • GFR below 30
  • All of the above
A

All of the above

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7
Q

Phase contrast techniques produce images in which the signal intensity within the vessel is dependent on which of the following factors

  • T1 of tissue
  • Velocity of blood flow
  • FOV
  • matrix
A

velocity of blood flow

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8
Q

At standard does, gad has the most apparent effect on__relaxation time and is therefore used as an enhancement agent on ___

A

T1/T1

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9
Q

Which sequence is appropriate for bright blood imaging

  • spin echo
  • balanced gradient echo
  • FLAIR
  • STIR
A

balanced gradient echo

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10
Q

Typical spin echo sequences produce images known as ___in cardiac imaging

A

black(dark) blood imaging

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11
Q

What is the minimum TR that would be required for a gated cardiac MRI procedure for a patient that has a heart rate of 80 bpm?

A

750ms

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12
Q

What is the extrinsic parameter that controls the amount of diffusion seen in an image?

A

B-value

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13
Q

a GE-EPI in perfusion imaging is used for?

A

for speed and to accentuate the T2* effects with a gradient echo

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14
Q

What imaging technique uses strong multi-directional gradients, provide models of brain connectivity, and is a standard for white matter disorders?

A

DTI

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15
Q

Due to its sensitivity to venous blood DWI is commonly used in traumatic brain injuries and for high resolution brain venography?
T/F?

A

False

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16
Q

Motion is the number one hurdle technologists face when scanning pediatric patients
T/F?

A

True

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17
Q

When scanning a pt fro seizures the coronal image should be angled with the hypocampus
T/F?

A

True

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18
Q

The Rt and Lt renal arteries lie inferior to the…

A

Superior mesenteric artery

19
Q

Inferior mesenteric vein empties into the splenic vein

T/F?

A

True

20
Q

What technique uses a short echo time and flow compensation to make flowing blood much brighter than stationary tissue?

A

TOF

21
Q

Which plane should be acquired for a MRA runoff study?

A

Coronal

22
Q

An advantage of non-contrast MRA is the ability to image slow flow often found in pts with vascular diseases?
T/F?

A

True

23
Q

___is controlled by using a fast breath-hold or respiratory triggered acquisitions

A

Respiratory motion

24
Q

Typically how many leads are used for gating?

A

4

25
Q

The mapping of white matter tracts can be accomplished by using strong multi-directional gradients in a technique called?

A

DTI

26
Q

You should always allow a parent to go into the scan room with the pt.
T/F?

A

False

27
Q

Peripheral pulse gating can be used for heart imaging?

T/F?

A

False

28
Q

What imaging technique is used to eliminate signal from water?

A

FLAIR

29
Q

The signal emitted by the voxel of interest in a scan utilizing PRESS is a?

A

Spin Echo

30
Q

For a MRA runoff study that contrast is being administered what gauge needle should be used?

A

20-22

31
Q

TOF MRA exams use what parameters to suppress signal in stationary tissue?

A
  • TR

- Flip angle

32
Q

Identify which of the following are a characteristic of any MRA procedure.

  • Acquire a setoff flow-sensitive base images
  • suppress the signal from stationary background tissue
  • generate projection images
  • enhance the signal from stationary background tissue
A
  • Acquire a setoff flow-sensitive base images
  • suppress the signal from stationary background tissue
  • generate projection images
33
Q

A 2C TOF MRA is ordered on a pt with a suspected occluded carotid artery. To reduce the risk of saturating the signal from blood, which is the best slice orientation for the 2D slice?

A

Axial

34
Q

What pulse sequence is used to detect strokes?

A

DWI

35
Q

Phase contrast angiography depends on___to generate the base images

  • inflow enhancement
  • flow voids
  • none of the above
  • phase effects of flow
A

Phase effects of flow

36
Q

Peristalsis can cause artifacts in the pelvis?

T/F?

A

True

37
Q

What sequence should be used in perfusion imaging when the transient change in T2* is measured?

A

GE-EPI perhaps with echo shifting where the TE is longer than the TR

38
Q

The parameter b factor is measured how?

A

s/mm^2

39
Q

A TOF MRA sequence uses a short echo time

T/F?

A

True

40
Q

In the pelvis the descending aorta branches into the common iliac arteries?
T/F?

A

True

41
Q

Which artifact is caused by the underestimation of maximum blood velocity in the image?

  • Maxwell
  • turbulent flow
  • acceleration
  • phase wrap
A

Phase wrap

42
Q

What is the best plane to use to visualize the aortic arch?

A

sagittal

43
Q

A tear or rip in the vessel is known as:

A

Dissection

44
Q

A MRV of the extremities would be appropriate to diagnose:

  • AVM
  • Necrosis
  • Thrombosis
  • severity of osteomylitis
A

Thrombosis

J's extra decks (9 decks)

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