What is the role of phase-contrast MRA in acute stroke imaging?

Updated: Dec 19, 2018
  • Author: Souvik Sen, MD, MPH, MS, FAHA; Chief Editor: Helmi L Lutsep, MD  more...
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Answer

Answer

Two-dimensional phase-contrast (PC) MRA is a technique that is helpful specifically in differentiating slow and absent flow from normal flow; it captures only truly patent vessels. Other imaging sequences (eg, spin-echo sequence or gradient-echo sequence) should be used with PC-MRA to avoid missing lesions such as paravascular hematomas, which are not captured by PC-MRA. PC-MRA also has the disadvantage of signal loss due to turbulent flow in tortuous vessels.


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