Q. All are true regarding dynamic susceptibility
contrast (DSC) MRI except
a. T2 and T2* are increased relative to normal physiologic
value
b. the contrast agent is usually injected as a rapid bolus
c. images are acquired rapidly to monitor the signal change
on time scales of 2 seconds or less
d. the tighter the bolus, the better
e. rapid the transit
time of contrast through the tissue is a big challenge of DSC MRI
ANS.---a
When contrast agent is present in
high concentration in the vasculature, T2 and T2* are decreased relative to
normal physiologic values. Smaller T2 or T2* means that the signal intensity on
T2- and T2*-weighted images is decreased relative to normal
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