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Re: high quality sound system for fMRI
> I came across another electro-static system with CE marking and a good
> frequency response from a group in Germany. It is a spin-off from an audio
> lab and they seem very competent. Their web site is
As far as I remeber, this group (Prof. Scheich's group in Magdeburg) used
dynamic headphones with magnets removed. Instead, the scanners's magnetic
field interacted with coils. This was done (AFAIR) in cooperation with
Sennheiser, one of the world's leading manufacturers of headphones.
1: Med Phys. 1998 Oct;25(10):2068-70.
Electrodynamic headphones and woofers for application in magnetic resonance
Baumgart F, Kaulisch T, Tempelmann C, Gaschler-Markefski B, Tegeler C,
F, Stiller D, Scheich H.
Leibniz-Institute for Neurobiology (IfN), Magdeburg, Germany.
Electrodynamic speakers compatible with (functional) magnetic resonance
(MRI) are described. The speakers magnets are removed, their function is
replaced by the scanner's magnetic field, resulting in an uncommon but
operation. The method can be used with headphones as well as woofers.
MRI is not associated with any known biological risks, but as a method for
visualization of task-specific activation of brain regions it is undesirably
noisy. Thus, it requires both noise protection and efficient sound
systems for delivering acoustic stimuli to subjects. Woofers could
used in active noise-control systems. The speakers described in this paper
be used for either task.
PMID: 9800716 [PubMed - indexed for MEDLINE]
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