Hi!
As I know you can introduce your gradient values manually into the Philips
console and it'S not a problem. The bad thing is that you can not
include more b=0 images in between(only at the beginning of the
sequence). the possibility would be to generate sequences with
different directions and run them sequentially but then you should
change the intensities for your images (for ex for your MD
calculations) as the scanner runs some dummy scans and calibrations at
the begin of every new sequence...
So if you find a better solution I would be very keen to hear about
it...
best
Sergiu
> Current Siemens MDDW-EPI allows you to specify your bvecs in a
> textfile. No need to hack thze code anymore. However, the textfile
> is a bit different from what FDT expects. But it's easy to go from
> one to the other.
> Cheers-
> Andreas
> -----Ursprüngliche Nachricht-----
> Von: FSL - FMRIB's Software Library im Auftrag von Matt Glasser
> Gesendet: Fr 16.05.2008 04:03
> An: [log in to unmask]
> Betreff: Re: [FSL] User defined gradient table for Philips Achieva
> I only have experience with Siemens scanners, but typically if you want more
> directions you have to hack the sequence code. As long as your gradients
> are in the right format (and normalized if your scanner requires that), I
> don't see why you couldn't use whatever directions you wanted.
> Peace,
> Matt.
> -----Original Message-----
> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
> Of Ted Yanagihara
> Sent: Thursday, May 15, 2008 9:47 PM
> To: [log in to unmask]
> Subject: [FSL] User defined gradient table for Philips Achieva
> Hi everyone,
> I know that there have been lots of discussions about getting the
> gradient directions from the par/rec files, but I haven't been able
> to find any threads on manually defining them on the scanner. The
> "maximum" option on the console only gives 32 directions, but we
> would like to see how things improve by manually increasing the
> number of directions. Does anyone have experience with generating a
> table of gradient directions? Would it make sense to use the bvecs
> from a GE scanner?
> Thanks in advance,
> ted
--
Mit freundlichen Grüßen
S. Groppa
mailto:[log in to unmask]
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