Hi Jürgen,
Not being a physicist, I can't speak to the issue of the TE, but another option for whole brain coverage is to use a sagittal slice orientation.
Our lab gets good results with the following parameters:
TR=2500
TE=28
#slices=45
slice thickness=3mm
no gap
Cheers,
Pete
On May 22, 2012, at 10:08 AM, Jürgen Hänggi wrote:
> Dear FSL experts
>
> We measured resting state fMRI data and would like to cover the whole brain
> incl. the cerebellum. We used a TR = 2200 ms and TE = 16 ms and were able to
> acquire 45 slices with 3 mm slice thickness.
>
> But the MR physicist of the MR unit claimed that a TE of 16 ms is too short
> to get a good BOLD-contrast. We recognized that most rsfMRI papers used TE
> of about 35 ms.
>
> Therefore I would like to know, whether a TE of 16 ms is really too short
> for rsfMRI analyses?
>
> If TE of 16 ms is too short, what is the preferred change?
>
> 1. using longer TR (4400 ms)
> 2. using less than 45 slices
> 3. increasing slice thickness
> 4. introducing a gap between slices
>
> Thanks in advance for any recommendation
> Regards
> Jürgen
>
> ----------------------------------------------------------------------------
> Jürgen Hänggi, Ph.D.
> Division Neuropsychology
> Institute of Psychology
> University of Zurich
> Binzmuehlestrasse 14, PO Box 25
> 8050 Zurich, Switzerland
> 0041 44 635 73 97 (phone office)
> 0041 76 445 86 84 (phone mobile)
> 0041 44 635 74 09 (fax office)
> BIN 4.D.04 (office room number)
> j.haenggi[at]psychologie.uzh.ch (email)
> http://www.psychologie.uzh.ch/neuropsy/ (website)
> http://www.juergenhaenggi.ch (private website)
>
> This e-mail (and any attachment/s) contains confidential and/or privileged
> information. If you are not the intended recipient (or have received this
> e-mail in error) please notify the sender immediately and destroy this
> e-mail. Any unauthorised copying, disclosure or distribution of the
> material in this e-mail is strictly forbidden.
> ----------------------------------------------------------------------------
|