[Dcmlib] Re: Overlays

[Jean-Pierre Roux]

Chahin Pachai wrote:

>  Salut!
>  
> j'espere que tout va bien!
>  
> j'ai une petite question pour vous! Est-ce qu'il est possible 
> d'exporter une image avec une indication dessinée dessus au format 
> DICOM a partir des consoles IRM? 
> ces dessins ou indications seront-il incrustes? j'ai des doutes... 
> sinon connaissez vous une astuce pour sauver une telle info et la 
> transmettre en DICOM (pointer une lesion, faire une mesure ...)?

There are Dicom groups called "Overlays" 0x6000, 0x6002, 0x6004, etc) 
that where supposed to hold 'overlay informations' (stuff you can choose 
to hide or display 'upon' the image.
We never had sample data to how it's actually used, so we never used them.
(we thought, at a time, to use the 'unused bits' of each pixel (16 bits 
Allocated, 12 bits stored) as a flag, (if it's set, we display a white 
pixel instead of the image pixel.
That's would enough to store 4 diferent 'overlays' -anything drawn on 
the image- (nothing possible if bits store = 16)
We (I, at least) are not even sure this is the right way to use them.
We (I, at least) never tried too much to undestrand how it's supposed to 
work.
Maybe Mathieu (or Loic) knows a secret URL where all the stuff is 
explained ?

--> Chahin, Loic :
'Reply All' : asking *all* the mailing list members, you have more 
chances to get an answer.
Thx
Jean-Pierre Roux


>  
> merci d'avance
>  
> Chahin
>
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> Chahin PACHAI, Ph.D. - CEO
> THERALYS
> Diagnostic & Therapeutic Image Analysis in Clinical Trials
>  
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