Thanks a lot!
What I found out is that in the par file there are 2 parameters for
angulation and it should be somehow possible to use these and the
original phillips directions to get the final bvecs...
but it is not writen somewhere, or I can not find it...
but thanks a lot for your help.
I'll post a solution if I find smth reasonable.
best wishes
Sergiu
> HI Sergiu,
> I'm afraid I don't know about this. I shall forward your email to
> the Physicist I worked with, and see if he knows. You could try
> sending a question about Phillips scans and bvecs to the list...I
> think there's a few people using this make of scanner and FSL, so
> someone must know the answer.
> There was a long thread about Phillips scans in the archives. I
> don't know what it was about, so it may or may not be helpful.
> The normalisation is recommended by FSL for all bvecs. It ensures
> that each direction in the bvecs has a magnitude of 1. There's an
> equation in the FDT section of the FAQs.
> Good luck with this, I'll follow your emails with interest.
> Suzanna
> On 29 Feb 2008, at 06:51, S. Groppa wrote:
>> Dear Suzanna,
>> Thanks a lot for your answer.
>>
>> you are right .par .rec is this philips intern format. And that's true
>> that actually you can get the bvecs from the scanner but because of
>> the angulation(I
>> hope that's the right word) the values are always slightly different
>> (as I understood just re-calculated in the patients plain).
>>
>> In some later versions of the par the values of the bvecs are in it,
>> in mine not...
>>
>> ok what about normalization of bvecs, is it alway needed? What for? Or
>> ist only a par/rec thing.
>>
>> I thank you very much!
>>
>> Sergiu
>>
>> the
>>> Hi Sergiu,
>>
>>> Are you using a Philips scanner for the par/rec files? If so you can
>>> get the bvecs from the scanner. I don't know if they're encoded in
>>> the par/rec files. You b values will relate to your images, so if
>>> you had 32 directions at b=10000 and 2 b=0 images, this forms your
>>> bvals file (obviously the order needs to match the bvecs). Also, as
>>> a reminder, don't forget to normalise your bvecs, it tells you how to
>>> do this in the FAQs on the FSL website.
>>
>>> Suzanna
>>
>>
>>> On 28 Feb 2008, at 18:13, S. Groppa wrote:
>>
>>>> Dear list,
>>>>
>>>> I apologize for this in a way repeated question but I did't find in
>>>> the list a complete answer for it.
>>>>
>>>> I've just got some *.par *.rec 's data - and tried to convert it to
>>>> fsl_nifti
>>>> which functioned quite good (through dcm2nii) - but
>>>>
>>>> without getting the bvals and bvec??
>>>>
>>>> with the error message par 4.1 not yet fully supported.
>>>>
>>>> I tried r2agui with no success.
>>>> Any other ideas of becoming the bvals and bvecs?
>>>>
>>>> thanks a lot and sorry for this never ending story.
>>>>
>>>> best wishes
>>>>
>>>> Sergiu
>>
>>
>>
>> --
>> Mit freundlichen Grüßen
>> S. Groppa
>> mailto:[log in to unmask]
--
Mit freundlichen Grüßen
S. Groppa
mailto:[log in to unmask]
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