Adjustable shunt valve-induced magnetic resonance imaging artifact: a comparative study.

Abstract:

OBJECT:In this paper, the authors' goal was to compare the artifact induced by implanted (in vivo) adjustable shunt valves in spin echo, diffusion weighted (DW), and gradient echo MR imaging pulse sequences. METHODS:The MR images obtained in 8 patients with proGAV and 6 patients with Strata II adjustable shunt valves were assessed for artifact areas in different planes as well as the total volume for different pulse sequences. RESULTS:Artifacts induced by the Strata II valve were significantly larger than those induced by proGAV valve in spin echo MR imaging pulse sequence (29,761 vs 2450 mm(3) on T2-weighted fast spin echo, p = 0.003) and DW images (100,138 vs 38,955 mm(3), p = 0.025). Artifacts were more marked on DW MR images than on spin echo pulse sequence for both valve types. CONCLUSIONS:Adjustable valve-induced artifacts can conceal brain pathology on MR images. This should influence the choice of valve implantation site and the type of valve used. The effect of artifacts on DW images should be highlighted pending the development of less MR imaging artifact-inducing adjustable shunt valves.

journal_name

J Neurosurg

journal_title

Journal of neurosurgery

authors

Toma AK,Tarnaris A,Grieve JP,Watkins LD,Kitchen ND

doi

10.3171/2009.9.JNS09171

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

74-8

issue

1

eissn

0022-3085

issn

1933-0693

journal_volume

113

pub_type

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