[MINC-users] mincresample of negative zsteps

[Roch M. Comeau]

Hi,

I was poorly describing the tilted CT gantry scenario you described.

Roch


On 2010-12-03, at 7:34 PM, Soren Christensen wrote:

> Hi Roch and Andrew,
> First thanks for your reply Andrew - I thought I replied but didn't.
> copying the header solved it for me.
> Roch, it sounds to me as if you are describing what is also the
> scenario of CT images acquired with gantry tilt:  Slices are parallel,
> but have an increasing y offset along the z dimension.
> However, in comment yo your statement:  "the thought may have been to
> support parallel slices that are skewed, so the slice spacing would be
> different (shorter)" ,  I don't see how MINC could support this -
> wouldn't that require a start coordinate for each slice?
> 
> 
> Cheers
> Soren
> 
> 
> On Sat, Dec 4, 2010 at 9:33 AM, Roch M. Comeau <rcomeau at mac.com> wrote:
>> Hi,
>> 
>> I may be wrong (I never fully understood MINC back then, and I usually used to just nod like I understood when Peter explained things so I did not look too dumb), but the thought may have been to support parallel slices that are skewed, so the slice spacing would be different (shorter) than the distance between the same voxel from slice to slice as described in the direction cosines (non-orthogonal coordinate system).
>> 
>> Roch
>> 
>> 
>> On 2010-11-02, at 12:23 AM, Andrew Janke wrote:
>> 
>>> I think so ( in this case). Peter oroginally made a distinction
>>> between the slice and in-plane dimensions for reasons known to him. I
>>> think a lot of the reason was around slice scaling of image ranges.
>>> 
>>> In any case it can sometimes make for some interesting (and at times)
>>> unexpected results. :(
>>> 
>>> 
>>> a
>>> 
>>> On Tue, Nov 2, 2010 at 14:48, Soren Christensen <sorench at gmail.com> wrote:
>>>> I am not sure where the problem arises (is it that zspace is my slowest
>>>> varying dim and the -1 you allude to?)
>>>> 
>>> _______________________________________________
>>> MINC-users at bic.mni.mcgill.ca
>>> http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
>> 
>> _______________________________________________
>> MINC-users at bic.mni.mcgill.ca
>> http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
>> 
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