"Air" filter

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"Air" filter

Samuele Zampini
Dear All,

I am looking for a filter that allows me to "select", in the most automatic way
possible, the air in a certain DICOM-series.
I know that I can use the threshold. In fact I am using it. The lower level is
-1000.. But the upper is not universal, but asaik it depends on different factors
(e.g. the CT-series, the patient himself etc).

The question is: is there a filter that allows me to do that??

Thanks a lot,

--
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 home        :   +390331823927       www:   samiam1000.spaces.live.com


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Re: "Air" filter

pieper
Administrator
Hi Samuele -

In general if the CT scan is well calibrated you should be able to rely
on the values it provides being pretty accurate in Hounsfield units:

http://en.wikipedia.org/wiki/Hounsfield_scale

As you point out though, scans and scanners are not always the same.
You may have good luck using the Ostu method to distinguish the tissue
from the background (air).

http://www.slicer.org/slicerWiki/index.php/Modules:OtsuThreshold-Documentation-3.6

Best,
Steve

On 10/29/2010 05:47 PM, Samuele Zampini wrote:

> Dear All,
>
> I am looking for a filter that allows me to "select", in the most
> automatic way
> possible, the air in a certain DICOM-series.
> I know that I can use the threshold. In fact I am using it. The lower
> level is
> -1000.. But the upper is not universal, but asaik it depends on
> different factors
> (e.g. the CT-series, the patient himself etc).
>
> The question is: is there a filter that allows me to do that??
>
> Thanks a lot,
>
> --
>
>                                       Samuele Z
> ____________________________________________________________________
>
>    .~.
>    /V\       L   I   N   U   X
>   // \\          I S    T H E
>   /(   )\           W A Y
>   ^^-^^
>   cell phone :  +393473426510       e.mail: [hidden email]
> <mailto:[hidden email]>
>   home        :   +390331823927       www: samiam1000.spaces.live.com
> <http://samiam1000.spaces.live.com>
>
>
>
> _______________________________________________
> slicer-users mailing list
> [hidden email]
> http://massmail.spl.harvard.edu/mailman/listinfo/slicer-users
> To unsubscribe: send email to [hidden email] with unsubscribe as the subject
_______________________________________________
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[hidden email]
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To unsubscribe: send email to [hidden email] with unsubscribe as the subject