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Underestimation of cerebral perfusion on flow-sensitive alternating inversion recovery image: semiquantitative evaluation with time-to-peak values.

Authors
Kim, HS; Kim, SY; Kim, JM
Citation
AJNR. American journal of neuroradiology, 28(10):2008-2013, 2007
Journal Title
AJNR. American journal of neuroradiology
ISSN
0195-61081936-959X
Abstract
BACKGROUND AND PURPOSE: We assessed the underestimation of cerebral perfusion measured by the flow-sensitive alternating inversion recovery (FAIR) technique in patients with carotid stenosis and compared the technique with dynamic susceptibility contrast (DSC) MR images.



MATERIALS AND METHODS: We studied 42 areas of decreased cerebral blood flow (CBF) using 3 FAIR images with different inversion times (TIs) in 42 consecutive patients with unilateral carotid stenosis of more than 50%. The width of decreased CBF area (wCBF) was qualitatively assessed. We analyzed the ratio of CBF (rCBF) and the time-to-peak (TTP) difference (dTTP) between the ipsilateral hemisphere to carotid stenosis and contralateral normal area using regions of interest (ROIs) at the same location.



RESULTS: In the areas with more prolonged TTP (dTTP > or =3.2 s), the wCBF obtained from the FAIR images with TI of 1600 ms was smaller than those from the FAIR images with a TI of 800 ms and 1200 ms in all cases. The mean rCBF obtained from the FAIR images with a TI of 1200 ms was significantly lower than that obtained from the FAIR images with a TI of 1600 ms (P < .01) in the areas with more prolonged TTP. In the areas with less prolonged TTP (dTTP <3.2 s), the wCBF and mean rCBF were not significantly different between the 2 FAIR images (TI, 1200 and 1600 ms).



CONCLUSION: If TTP is delayed significantly (dTTP > or =3.2 s), the FAIR with intermediate or short TI showed underestimation of perfusion in the same area with delay in TTP.
MeSH terms
AdolescentAdultAgedAged, 80 and overCarotid Artery, Internal*Carotid Stenosis/physiopathologyCerebrovascular Circulation*Contrast MediaFemaleGadolinium DTPA/diagnostic useHumansMagnetic Resonance Imaging*MaleMiddle Aged
DOI
10.3174/ajnr.A0720
PMID
17898193
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Radiology
AJOU Authors
김, 호성김, 선용
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