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Criteria for the estimation of carotid artery stenosis by CTA and MRA are based on the
a. intraluminal contrast density
b. blood flow velocity
c. thickness of the intimal plaque
d. measurement of the luminal diameter
d. measurement of the luminal diameter
A patient is receiving thrombolytic agents for an iliofemoral venous thrombosis. Which of the following techniques is essential for monitoring thrombolytic therapy?
a. duplex ultrasound
b. contrast venography
c. CT venography
d. MR venography
b. contrast venography
Contraindications to MRA include all but which of the following?
a. claustrophobia
b. Scarring forms surgical incisions
c. certain implanted devices such as a pacemaker
d. patient unable to hold their breath
b. Scarring forms surgical incisions
Which of these statements is incorrect with respect to imaging evaluation of traumatic vascular injury?
a. MRA is of limited value due to longer acquisition times
b. CTA can identify sides of arterial bleeding and permit arteriography to be directed to the vessels requiring intervention
c. Duplex ultrasound is usually insufficient to evaluate femoral artery injury after catheterization
d. MRA is difficult due to the monitoring of unstable patients inside the magnet
c. Duplex ultrasound is usually insufficient to evaluate femoral artery injury after catheterization
the following are examples of digital image reformatting in CTA or MRA except
field-of-view (FOV)
limitations associated with the evaluation of intravascular stents include the following except
endoleaks associated with aortic stent-grafts require DSA for detection
these conditions may be diagnosed by CT or MR venography of the abdomen and pelvis except
Lemierre's syndrome
which image modality is used as a guidance during carotid stent placement
digital subtraction angiography
MRA detection of renal artery stenosis can be challenging due to
tissue motion associated with longer acquisition times
arterial and venous causes for mesenteric ischemia can be differentiated by a single examination except in the case of
dsa
the case in which multiplanar digital image reconstruction demonstrate resolution similar to that in the original acquisition is referred to as
isotropic resolution
which of the statements about the technique referred to by the acronym TRICKS is incorrect
it involves the use of large contrast boluses
DSA is considered to be more invasive than other imaging techniques because
direct arterial access required
disadvantages of CTA include all except
long length of time to acquire images
this test has replaced ventilation/perfusion (V/Q) scanning
CTA