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Programmable CSF Shunt Valve: In Vitro Assessment of MR Imaging Safety at 3T

F.G. Shellocka, R. Habibib and J. Knebelc

a Keck School of Medicine, University of Southern California and Institute for Magnetic Resonance Safety, Education, and Research, Los Angeles, Calif
b Beverly Hills 3T Imaging and Research Center, Beverly Hills, Calif
c Christoph Miethke GmbH & Co. KG, Potsdam, Federal Republic of Germany


Figure 1
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  		Fig 1. The programmable valve that underwent evaluation for MR imaging safety at 3T.


Figure 2
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  		Fig 2. The experimental setup used to assess MR imaging–related heating for the programmable valve, showing the implant in position on the plastic frame placed on the bottom of the head/torso phantom. Note the cables going to the fluoroptic thermometry probes.


Figure 3
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  		Fig 3. The 18 samples of the programmable valve shown attached to the cylinder-shaped phantom in preparation for the static magnetic field exposures (sagittal orientation).


Figure 4
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  		Fig 4. The 18 samples of the programmable valve shown attached to the cylinder-shaped phantom in preparation for the static magnetic field exposures (simulated patient orientation).


Figure 5
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  		Fig 5. Examples of MR images showing artifacts for the programmable valve (gradient-echo pulse sequence; TR/TE, 100/15; flip angle, 30°; section thickness, 5 mm; field of view, 24 cm) at 3T. A, Section location oriented to the long axis of the programmable valve. B, Section location oriented to the short axis of the programmable valve.





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X