Christian,
thank you.
Although for the conversion, wouldn't it be more like:
Call Xo, Yo, Zo the three voxel coordinates of the middle voxel (i.e.
the voxel at mm 0,0,0)
call resX, resY, resZ the voxel resolution
call X,Y,Z the coordinates of a voxel you want to transform in mm coords:
X axis:
if(X<Xo) --> |X-Xo|*resX
if(X>=Xo) --> |X-Xo|*resX*-1
Y axis:
if(Y<Yo) --> |Y-Yo|*resY*-1
if(Y>=Yo) --> |Y-Yo|*resY
Y axis:
if(Z<Zo) --> |Z-Zo|*resZ*-1
if(Z>=Zo) --> |Z-Zo|*resZ
Is there a more obvious way?
martin
Christian Beckmann wrote:
> Hi Martin,
>
> 1) yep, absolutely correct, the first is the number of voxels, the
> second number is the same multiplied by the voxel volume (i.e. in mm^3)
> 2) avwstats(++) does not yet support outputting this in mm rather than
> voxels - but you only need to multiply by the appropriate x,y,z voxel
> dims to get this in mm
>
> hope this helps
> Christian
>
>
>
>
>
> On 8 Feb 2007, at 19:24, Martin M Monti wrote:
>
>> Dear FSL gurus,
>>
>> I have a couple small questions about avwstats(++)
>>
>> 1) avwstats -V: the frist number is the voxel count, the second,
>> volume, is that the same count but at the T1 resolution?
>> 2) avwstats -w: Is it possible to get a mm output rather than a voxel
>> output? (kind of like the -c vs -C option with avwstats++)
>> Alternatively, is there a tool to go from the former to the latter?
>>
>> cheers
>>
>> martin
>>
>>
>>
>>
>> --------------------------------------------
>> "Well! I've often seen a cat without a grin; but a grin without a
>> cat! It's the most curious thing I ever say in my life!" [Lewis
>> Carroll, Alice in Wonderland]
>>
>> - “Contrariwise,” continued Tweedledee, “if it was so, it might be;
>> - and if it were so, it would be;
>> - but as it isn’t, it ain’t.
>> - That’s logic.” [Lewis Carroll, Through the Looking-Glass]
>>
>> --------------------------------------------
>> Martin M. Monti, MA
>> Princeton University
>> Department of Psychology
>> Green Hall 3-S-8
>> (609) 258-5679
>> www.webmartin.net
>> --------------------------------------------
>
> --
> Christian F. Beckmann
> Oxford University Centre for Functional
> Magnetic Resonance Imaging of the Brain,
> John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
> Email: [log in to unmask] - http://www.fmrib.ox.ac.uk/~beckmann/
> Phone: +44(0)1865 222551 Fax: +44(0)1865 222717
--
--------------------------------------------
"Well! I've often seen a cat without a grin; but a grin without a cat! It's the most curious thing I ever say in my life!" [Lewis Carroll, Alice in Wonderland]
- Mais alors que dois-je devenir?
- Un curieux!
- Ce n’est pas un métier.
- Ce n’est pas encore un métier. Voyagez, écrivez, traduisez, apprenez à vivre partout. Commencez tout de suite. L’avenir est aux curieux de profession. [Truffaut - Jules et Jim]
I became insane, with long intervals of horrible sanity. [E.A. Poe]
- “Contrariwise,” continued Tweedledee, “if it was so, it might be;
- and if it were so, it would be;
- but as it isn’t, it ain’t.
- That’s logic.” [Lewis Carroll, Through the Looking-Glass]
- "Would you tell me, please, which way I ought to go from here?"
- "That depends a good deal on where you want to get to," said the Cat.
- "I don't much care where-" said Alice.
- "Then it doesn't matter which way you go," said the Cat.
- "As long as I get somewhere," Alice added as an explanation.
- "Oh, you're sure to do that," said the Cat, "if you only walk long enough." [Lewis Carroll, Alice in Wonderland]
--------------------------------------------
Martin M. Monti
Princeton University
Department of Psychology
Green Hall 3-S-8
(609) 258-5679
www.webmartin.net
--------------------------------------------
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