[Insight-users] Origin of Analyze Format data

[Luis Ibanez]

Hi Tanya,

I'm not sure what the "originator" field is supposed
to represent in the Analyze header.


The specification of the Analyze header

      http://www.mayo.edu/bir/PDF/ANALYZE75.pdf

just list this field as a "10 chars".


While the following table actually leads to think
that the 10 chars have been used as 5 signed short
(16 bits) integers:

http://www.grahamwideman.com/gw/brain/analyze/formatdoc.htm


Hopefully a more knowledgeable person on the Analyze
format could give us some hints regarding the intended
use of this field.



     Regads,


        Luis


--------------
Tanya wrote:
> Thank you very much for your reply, Luis,
>  
> By the way, what is "originator" in data_history of Analyze format?
>  
> Thanks in advance,
> Tanya
> 
> */Luis Ibanez <luis.ibanez at kitware.com>/* wrote:
> 
> 
>     Hi Tanya,
> 
>     Since Analyze does not store the origin of the dataset,
>     you may have to go back to your image provider.
> 
>     Chances are that there is an origin DICOM dataset
>     sitting in some directory, or in a PACS system.
> 
>     When you read the analyze file with ITK the origin
>     will simply be set to the default of (0,0,0).
> 
>     You will still be able to register this images.
> 
>     The only difference is that you have to be careful
>     with the interpretation of the resulting transform.
> 
>     That is, the transform will be good enough for
>     doing things like resampling the image, and
>     performing visualization, but it will not be
>     good enough for driving an image guided surgery
>     system.
> 
> 
> 
>     Regards,
> 
> 
>     Luis
> 
> 
>     ------------
>     Tanya wrote:
>      > Dear Insight-Users,
>      >
>      > Where can we find the Origin of an Analyze Format data?
>      >
>      > If Analyze does not save Origin of the data, then how can ITK
>     register
>      > the image, since registration should be done in physical
>     coordinate, and
>      > to convert from image coordinate to physical coordinate we should
>     now
>      > the origin and the spacing?
>      >
>      > Answers would be appreciated.
>      >
>      > TIA,
>      > Tanya.
>      >
>      >
> 
> 
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