Van: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] namens Andre van der Kouwe [andre@nmr.mgh.harvard.edu]
Verzonden: dinsdag 1 april 2014 15:37
Aan: Bruce Fischl; Freesurfer support list
Onderwerp: Re: [Freesurfer] quality T1 scans for new study

No, I think that's a reasonable protocol to use and good to use SENSE to speed it up.

-------- Original message --------
From: Bruce Fischl
Date:04/01/2014 2:28 PM (GMT+02:00)
To: Freesurfer support list
Cc: Andre van der Kouwe
Subject: Re: [Freesurfer] quality T1 scans for new study

looks pretty reasonable. Andre: any comments/suggestions?

On Tue, 1 Apr
2014, Kok, JG (neuro) wrote:

> Hi Bruce,
>
> Thanks for your fast reply.
>
> Hereby I attach the parameter files of both scans (although I suspect looking at the parameters of "scan1" may be sufficient). Checking it with the information on Philips at "http://www.nmr.mgh.harvard.edu/~andre/FreeSurfer_recommended_morphometry_protocols.pdf":
>
> "
> Sequence: T1W_3D_TFE_SENSE
> Acquisition time: 5:13
> Voxel size: 1.0 x 1.0 x 1.0 mm3
> Geometry: FoV 256 mm (256 x 256 matrix), 176 sagittal slices, slice thickness 1 mm, (3D encoding)
> Timing: TR shortest (7600 ms), TI 1100 ms, TE shortest (3.5 ms), bandwidth 191.5 Hz/px
> RF: flip angle 7°
> Acceleration: 2x SENSE
> "
>
> suggests that parameters in "scan1_parameter_file.txt" are already pretty similar to those I guess. (Is it the SENSE that is missing in our protocol that is the most important difference?)
>
> Thanks,
>
> Jelmer
>
> ________________________________________
> Van: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] namens Bruce Fischl [fischl@nmr.mgh.harvard.edu]
> Verzonden: dinsdag 1 april 2014 14:09
> Aan: Freesurfer support list
> Onderwerp: Re: [Freesurfer] quality T1 scans for new study
>
> Hi Jelmer
>
> if you give us the specific acquisition details we can help more (receive
> coil, acceleration, voxel size, sequence type, TR/TE/TI/flip
> angle/bandwidth, etc....). We also have recommended morphometry sequences
> on our website.
>
> 10 min is a pretty long structural scan for a modern MRI scanner.
>
> cheers
> Bruce
>
> On Tue, 1 Apr 2014,
> Kok, JG (neuro) wrote:
>
>> Dear Freesurfer experts,
>> We are planning to start a new MRI study which will include T1 scans. As we
>> are in a testing phase now, I was wondering whether you could comment on the
>> attached screenshots. Clearly, "scan1" has a better white matter/grey matter
>> contrast than "scan2". Do you think going for "scan1" would be the sensible
>> thing to do when we later wish to use Freesurfer with these scans? Or
>> perhaps is neither of the examples I attached good enough?
>>
>> By the way, these scans were acquired on a Philips 3T scanner, both taking
>> around 10 minutes.
>>
>> It you need any more information, please let me know. Many thanks in advance
>> for your advice.
>>
>> Jelmer Kok
>>
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