[Insight-users] DICOM WINDOW CENTER AND WIDTH

[Roberto Laurita]

Hi Lazar,

thank you for the answer.

It's better to supply more details. I have 1 slice acquired 2 times with a
different TR. So I have 2 dicom files.
Reading the headers of these 2 files I found different values of "window
center" and "window width". The MRI scanner provided 2 couples of values
for rendering reason.

I'd like to know if it's possible to set "window center" and "window
width" in the second file the same values of the first one. I need to
compare the intensities (with different TR) of the same pixel

I thought about manual rescaling, but ...... if there is a better way ......

Thanks again

Ciao

Roberto


2011/12/29 Fleysher, Lazar <lazar.fleysher at mountsinai.org>

> Hello Roberto
>
> If I understood you correctly, you are asking how to convert from pixel
> intensity to image intensity.
> This is done, as far as I know like this:
>
> ImageValue = slope * storedValue + intercept.
>
> However, you should be aware that this is not the whole story. Some other
> hardware-related
> parameters might be at play which might contribute to scaling. It depends
> on how the data was acquired...
>
> Lazar
> ________________________________________
> From: insight-users-bounces at itk.org [insight-users-bounces at itk.org] on
> behalf of roberto.laurita [roberto.laurita at gmail.com]
> Sent: Wednesday, December 28, 2011 17:57
> To: insight-users at itk.org
> Subject: [Insight-users] DICOM WINDOW CENTER AND WIDTH
>
> Hi all,
>
> I hope someone will help me. My deal is to import and compare 2 slices
> (.dcm).
>
> In Dicom header there are 2 parameters 0028|1050 and 0028|1051 which work
> like contrast and brightness. I need to modify these parameters. Doing
> this,
> pixel intensity should be modified.
>
> Using ITK examples I'm able to do everything (read dicom header, and read
> pixels) but the change above.
>
> To compare pixel intensities of 2 slice windows center and width must be
> the
> same. A normalization is required.
>
> Could you suggest me how to change windows center and width ?
>
> Thanks
>
> BR
>
> Roberto
>
> --
> View this message in context:
> http://itk-insight-users.2283740.n2.nabble.com/DICOM-WINDOW-CENTER-AND-WIDTH-tp7134284p7134284.html
> Sent from the ITK Insight Users mailing list archive at Nabble.com.
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://www.kitware.com/products/protraining.html
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20111229/f61fa250/attachment.htm>