Hi -
That's not exactly right. In order to view vector images in RGB mode modulated by a scalar image like FA, you can load the images in any order. The order does not matter in that case. It does only matter if you want to be able to scroll through the 4th dimension in the 4D image.
The only reason I can think of in the case of Alessio is a problem with the min/max of the FA image, which in previous versions of dtifit was set incorrectly, and this badly interacted with the modulation in fslview.
A quick fix for that is to run fslmaths on the FA image: "fslmaths dti_FA dti_FA".
This will simply load and save the dti_FA image without changing it, but setting the min/max correctly.
Alternatively, you can use the last version :-)
Cheers,
Saad.
On 14 Nov 2008, at 09:07, Markus Gschwind wrote:
Hi!
When loading several datasets of different dimensionality (3D like dti_FA and 4D like dti_V1) into FSLVIEW you should always first load the one with 4D and them superimpose the 3D.
The otherway round is not possible.
Afterwards you can always change the one who is above by means of the up-/down-arrows on the right.
Does this answer your question?
All the best,
Markus
2008/11/14 Ale
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Hi all,
I have a little problem with colormap generation in fslview. To perform dti, I collected 2 different dataset (each one is composed by 1 b0 and 65 dw volumes). With the single dataset I didn't have any problem, but when I averaged the 2 acquisitions together I wasn't been able to obtain the dti_V1 modulated by dti_FA: I could only superimpose dti_V1 (in RGB mode) on dti_FA and then adjust the intensity of dti_V1 in order to obtain something similar to a colormap.. any suggestion?
I hope the problem is clear from my description.
All the Best
Dr. Alessio Moscato
Medical Physicist
Medical Physics Dep.
Niguarda Ca' Granda Hospital
Milan, Italy
--
Dr. med. Markus Gschwind, M.D.
Laboratory for Neurology and Imaging of Cognition
Dept of Neurosciences
University Medical Center (CMU)
1 Michel-Servet - 1211 GENEVA - CH
Tel 0041 (0) 22 379 5324
Fax 0041 (0) 22 379 5402
email: [log in to unmask]
http://labnic.unige.ch
Saad Jbabdi
Oxford University FMRIB Centre
JR Hospital, Headington, OX3 9DU, UK
+44 (0) 1865 222545 (fax 717)