1.5-Tesla pulsed arterial spin labeling灌流画像における頚動脈ステント留置前後の内頚動脈錐体骨部arterial transit artifactの変化

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  • Changes of the Arterial Transit Artifact of the Petrous Internal Carotid Artery Following Carotid Artery Stenting on 1.5-Tesla Pulsed Arterial Spin Labeling Perfusion Image
  • 1.5-Tesla pulsed arterial spin labelingカンリュウ ガゾウ ニ オケル ケイドウミャク ステント リュウチ ゼンゴ ノ ナイ ケイドウミャク スイタイ ホネブ arterial transit artifact ノ ヘンカ

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Purpose : We investigated the relationship between the arterial transit artifact (ATA) of the petrous portion of the internal carotid artery (pICA) on 1.5-T pulsed arterial spin labeling (ASL) perfusion images and hemodynamic changes on digital subtraction angiography (DSA) before and after carotid artery stenting (CAS) in patients with ICA stenosis. Method : ASL images were taken with postlabeling delay (PLD) of 1.5 s and 2.0 s before and after CAS, and these findings were compared with those of DSA in nine patients. Results : On pre-CAS ASL, ATA of the pICA was visualized both on PLD 1.5 s and 2.0 s in six cases, in which DSA demonstrated stagnation of contrast medium in the pICA and delayed visualization of the distal MCA. Immediately after CAS, DSA showed improvement in these findings : pICA was either visualized or not visualized on ASL images at 1.5 s, and disappeared at 2.0s. Conclusion : The presence of ATA of the pICA both on PLD 1.5 and 2.0 s suggests stagnation of blood flow within pICA with delayed visualization of the MCA and its disappearance after the CAS demonstrates improvement of these findings.

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