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Randomized Controlled Trial
. 2012 Dec;33(11):2162-6.
doi: 10.3174/ajnr.A3124. Epub 2012 Jun 7.

Follow-up of coiled intracranial aneurysms: comparison of 3D time-of-flight MR angiography at 3T and 1.5T in a large prospective series

L Pierot  1 , C Portefaix, J-Y Gauvrit, A Boulin
Affiliations
Randomized Controlled Trial

Follow-up of coiled intracranial aneurysms: comparison of 3D time-of-flight MR angiography at 3T and 1.5T in a large prospective series

L Pierot et al. AJNR Am J Neuroradiol. 2012 Dec.

Abstract

Background and purpose: Our aim was to compare 3D TOF-MRA sequences at 3T and 1.5T in the follow-up of coiled aneurysms. The follow-up of coiled intracranial aneurysms is mandatory to depict potential recanalization. 3D-TOF MRA is an appropriate tool for this purpose.

Materials and methods: DSA and 3D TOF-MRA at 1.5T and 3T were performed in a prospective series of 126 aneurysms in 96 patients (58 women, 38 men; age, 25-75 years; mean, 51.3 ± 11.3 years). DSA was the reference standard to which the accuracy of 3D TOF-MRA was compared. The quality of aneurysm occlusion was assessed independently and anonymously by a core lab by using a 3-grade scale (total occlusion, neck remnant, and aneurysm remnant). Adequate occlusion was defined as total occlusion or neck remnant and used in a 2-grade scale: adequate occlusion/aneurysm remnant.

Results: With DSA, total occlusion was depicted in 58 aneurysms (46.0%); neck remnant, in 33 aneurysms (26.2%); and aneurysm remnant, in 35 aneurysms (27.8%). Adequate occlusion was seen in 91 cases (72.2%). A remnant (aneurysm or neck) was depicted in 68 cases (54.0%). For the 3 imaging techniques and regardless of scale used, the interobserver agreement was always greater at 3T than at 1.5T. SE and NPV for the prediction of aneurysm remnant versus adequate occlusion were higher at 3T than at 1.5T (SE 3T, 0.74; SE 1.5T, 0.54; NPV 3T, 0.90; NPV 1.5T, 0.85).

Conclusions: In this large prospective series of patients, 3D TOF-MRA was superior at 3T to 1.5T for the evaluation of coiled intracranial aneurysms.

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Conflict of interest statement

The authors declare that they have no conflict of interest with the topic of the manuscript.

Figures

Fig 1.
Fig 1.
Anterior communicating artery aneurysm treated with coils. MRA at 1.5T (source images, A; MIP reconstruction, B) shows total occlusion of the aneurysm (white arrow). MRA at 3T (source images, C; MIP reconstruction, D) shows an aneurysm remnant (white arrow). DSA (anteroposterior view, E; lateral view, F shows the aneurysm remnant (white arrow).
See this image and copyright information in PMC

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