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MRA of intracranial aneurysms embolized with platinum coils: A vascular phantom study at 1.5T and 3T

✍ Scribed by Shingo Kakeda; Yukunori Korogi; Yasuhiro Hiai; Toru Sato; Norihiro Ohnari; Junji Moriya; Koji Kamada

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 432 KB
Volume: 28
Category: Article
ISSN: 1053-1807
DOI: 10.1002/jmri.21421

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✦ Synopsis

Abstract

Purpose

To analyze the influence of matrix and echo time (TE) of three‐dimensional time‐of‐flight (3D TOF) magnetic resonance angiography (MRA) on the depiction of residual flow in aneurysms embolized with platinum coils at 1.5T and 3T.

Materials and Methods

A simulated intracranial aneurysm of the vascular phantom was loosely packed to maintain the patency of some residual aneurysmal lumen with platinum coils and connected to an electromagnetic flow pump with pulsatile flow. MRAs were obtained altering the matrix and TE of 3D TOF sequences at 1.5T and 3T.

Results

The increased spatial resolution and the shorter TE offered better image quality at 3T. For the depiction of an aneurysm remnant, the high‐spatial‐resolution 3T MRA (matrix size of 384 × 224 and 512 × 256) with a short TE of ≤3.3 msec were superior to the 1.5T MRA obtained with any sequences.

Conclusion

3T MRA is superior to 1.5T MRA for the assessment of aneurysms embolized with platinum coils; the combination of the 512 × 256 matrix and short TE (3.3 msec or less) seems feasible at 3T. J. Magn. Reson. Imaging 2008;28:13–20. © 2008 Wiley‐Liss, Inc.

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