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Pointwise Encoding Time Reduction with Radial Acquisition with Subtraction-Based MRA during the Follow-Up of

Y J Heo1, H W Jeong2, J W Baek1

  • 1From the Departments of Radiology (Y.J.H., H.W.J., J.W.B.).

AJNR. American Journal of Neuroradiology
|April 13, 2019
PubMed
Abstract

Insights

Pointwise encoding time reduction with radial acquisition (PETRA) subtraction-based MRA offers superior visualization of stent-assisted coil embolization follow-up compared to time-of-flight MRA. PETRA qMRA provides more accurate assessment of aneurysm occlusion status.

Area of Science:

  • Neuroradiology
  • Medical Imaging
  • Cardiovascular Interventions

Background:

  • Time-of-flight MR angiography (TOF-MRA) has limitations for evaluating stent-assisted coil embolization due to magnetic susceptibility and radiofrequency shielding.
  • Stent-assisted coil embolization is a common treatment for anterior circulation aneurysms.

Purpose of the Study:

  • To evaluate the efficacy of the pointwise encoding time reduction with radial acquisition (PETRA) sequence in subtraction-based MRA (qMRA) for follow-up after stent-assisted coil embolization.
  • To compare PETRA qMRA with TOF-MRA in assessing stent patency and aneurysm occlusion.

Main Methods:

  • Retrospective analysis of 25 patients who underwent stent-assisted coil embolization for anterior circulation aneurysms.
  • Comparison of TOF-MRA and PETRA qMRA data from the same follow-up session.
  • Independent review by two neuroradiologists assessing stent flow and aneurysm occlusion status, with comparison to digital subtraction angiography (DSA).

Main Results:

  • PETRA qMRA demonstrated significantly higher scores for flow visualization within stents compared to TOF-MRA (P < .001).
  • Aneurysm occlusion status assessment by PETRA qMRA showed better consistency with DSA than TOF-MRA.
  • Improved intermodality agreement was observed between DSA and PETRA qMRA compared to DSA and TOF-MRA.

Conclusions:

  • PETRA qMRA is a valuable follow-up imaging technique for patients treated with stent-assisted coil embolization for anterior circulation aneurysms.
  • PETRA qMRA offers improved visualization and more accurate assessment of treatment outcomes compared to TOF-MRA.

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