Comparison of Programmable Ventriculoperitoneal Shunt Artifacts between 3.0 and 1.5 T MR Scanner : A proGAV2.0 Device (Aesculap) Study using General Electric Scanner

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  • MRIロック圧可変式シャントバルブのアーチファクト3.0 Tと1.5 T MRIの比較

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Abstract

<p>  Although MR resistant programmable shunt devices have been widely employed in clinical use, artifacts are still problematic. We compared proGAV2.0 (Aesculap) artifacts between 3.0 and 1.5 T MR scanner (Signa Pioneer and Twin Speed, GE Healthcare).</p><p>  Under permission of our institutional ethical committee, two volunteers underwent routine MR imaging consisting of T1, T2, FLAIR, and diffusion weighted images, with a 5 cm H2O-pressure programmed shunt device tightly bound on the left temporal scalp. The area of artifacts of 3.0 T and 1.5 T scanners were manually calculated and compared. In order to clarify the involvement of bandwidths, narrow and wide bandwidths were used with one volunteer in 3.0 T scanner and images were compared. In T1, T2, FLAIR, and diffusion weighted images, the total, and maximum area of the artifacts were smaller in the 3.0 T scanner than the 1.5 T scanner. Wider bandwidth showed smaller artifacts than narrow bandwidth in the same 3.0 T scanner.</p><p>  It is well known that 3.0 T scanners show larger clip artifacts than 1.5 T scanners. In this study, however, the artifacts of the shunt device containing permanent magnets were smaller in the 3.0 T scanner than those of the 1.5 T scanner. This might be partly due to the wider bandwidth commonly used in 3.0 T scanners. The ferromagnetic effect may also play a part in our results. Further studies are necessary to confirm these findings among the other shunt devices and MR scanners.</p>

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