[Insight-developers] Image as an OrientedImage Progress

[Luis Ibanez]

Kent,

Actually this is the real case of most CT, MRI and Confocal
Microscopy images.

The slices along Z are not acquired simultaneously, but with some
lag in time, (which may be milliseconds in current scanners)...
but still.

When moving along Z in a CT scan, we are usually moving along
time as well.


Strictly speaking, most 3D images are actually aligned along
diagonal axes in the 4D space composed of 3D + time.


We tend to simply disregard this effect.


     Luis


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kent williams wrote:
> This is where my brain starts to hurt. My brain can handle 3D orientation
> that isn't aligned with world unit axes.  But when you go to 4D, you can
> also have images oriented off the time axis as well, somehow diagonal to
> time's arrow.
> 
> Luckily no one makes a scanner yet that can scan tesseract volumes.
> 
> 
> On 9/22/08 10:39 AM, "Steve M. Robbins" <steve at sumost.ca> wrote:
> 
>>Is it possible that the Image class could simply acquire a new
>>template parameter for SpatialDimension?  But then there are 4D
>>coordinate systems where one dimension is time; you might have a
>>2D or 3D slice out of a 4D space and desire the origin and direction
>>cosines to use the 3D spatial coordinates.
>>
> 
> 
>