[Insight-users] Need help with PermuteAxesImageFilter

[Luis Ibanez]

Hi Martin,

Yes, I meant that you need to permute the content of the tags.

For example, if your permute axes filter swaps the X and Y axes,
then you have to go to the spacing tag and swap the x and y
values of the spacing, you should also swap the number of
colunns and rows.... and so on.

If the Frames tag is not found... then you have to go through
the fun of using the Series Image Reader, get the number of
slices from it and swap the information accoding to the
type of permutation that you are using in the permute filter.

Yes, you also have to do that on *ALL* the dictionaries.

BTW, I forgot to mentinon that you also MUST do this for the
Origin and the Orientation tag, since the coordinates of the
origin and the direction cosines will permute too.

Unfortunately there is no convenience class for doing this at
this point. It will be great to have one. If you are interested
in writing one and contributing it to the toolkit we will be
happy to include it in a future release.



    Regards,


       Luis



-----------
MX wrote:
> 
> Hi Luis,
> i'm sorry but i'm not sure if i'm getting it.
> You said, that I've to permute these header tags in order of my image 
> permutation.
> 
>>
>>
>>     0x0028 0x0010   Rows
>>     0x0028 0x0011   Columns
>>     0x0028 0x0008   Frames ( could not be found )
>>     0x0028 0x0020   Pixel Spacing  ( should be 0028|0030, right? )
>>     0x0018 0x0088   Spacing between slices ( slice thickness? )
> 
> 
> Does that mean, that for example if I've had a permutation order of 2,0,1
> the Columns tag should be on the position for the Frames tag if found?
> And what about if the Frames tag is not found?
> 
> Another thing is, because it's a array of dictionaries i should iterate 
> over all
> dictionaries and change these headers, or is there a convenience class 
> that does
> that sort of work?
> 
> Thanks again,
> Martin
> 
> 
>