Hi Diederick,
Since the principal source of noise are vibrations produced by the gradients
blipping, you can try decreasing the bandwidth/increasing the echo-spacing.
Your total readout time will go up, so you will have more distortions and
drop-out, so you will have to reach some compromise.
HTH,
-Pablo
On Fri, 18 Dec 2009 18:48:05 +0100, Diederick Stoffers
<[log in to unmask]> wrote:
>Hi all,
>
>A question not relating to software, but perhaps someone would be wiling to
help us out.
>
>We are trying to heave subjects fall asleep during fMRI acq, we would like
to have a more "silent" EPI sequence. There are quite some publications from
groups that have a relatively silent EPI sequence running on a Siemens
machine. We have a 3T GE Signa HD and a 3T Philips Intera available. We have
been playing around with the factory provided silent mode options on both,
but are not particularly happy with the results (high TR/TE/slice thickness,
not much noise reduction). Does anyone have a reasonably performing "silent"
EPI on a GE or Philips system running? Can anyone recommend what settings
to use?
>
>Thanks,
>
>Diederick
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