Hi Lazar, <div><br></div><div>thank you for the answer.</div><div><br></div><div>It's better to supply more details. I have 1 slice acquired 2 times with a different TR. So I have 2 dicom files. </div><div>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. </div>
<div><br></div><div>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</div>
<div><br></div><div>I thought about manual rescaling, but ...... if there is a better way ......</div><div><br></div><div>Thanks again</div><div><br></div><div>Ciao</div><div><br></div><div>Roberto</div><div> </div><div>
<br><div class="gmail_quote">2011/12/29 Fleysher, Lazar <span dir="ltr"><<a href="mailto:lazar.fleysher@mountsinai.org">lazar.fleysher@mountsinai.org</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello Roberto<br>
<br>
If I understood you correctly, you are asking how to convert from pixel intensity to image intensity.<br>
This is done, as far as I know like this:<br>
<br>
ImageValue = slope * storedValue + intercept.<br>
<br>
However, you should be aware that this is not the whole story. Some other hardware-related<br>
parameters might be at play which might contribute to scaling. It depends on how the data was acquired...<br>
<br>
Lazar<br>
________________________________________<br>
From: <a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a> [<a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a>] on behalf of roberto.laurita [<a href="mailto:roberto.laurita@gmail.com">roberto.laurita@gmail.com</a>]<br>
Sent: Wednesday, December 28, 2011 17:57<br>
To: <a href="mailto:insight-users@itk.org">insight-users@itk.org</a><br>
Subject: [Insight-users] DICOM WINDOW CENTER AND WIDTH<br>
<div class="HOEnZb"><div class="h5"><br>
Hi all,<br>
<br>
I hope someone will help me. My deal is to import and compare 2 slices<br>
(.dcm).<br>
<br>
In Dicom header there are 2 parameters 0028|1050 and 0028|1051 which work<br>
like contrast and brightness. I need to modify these parameters. Doing this,<br>
pixel intensity should be modified.<br>
<br>
Using ITK examples I'm able to do everything (read dicom header, and read<br>
pixels) but the change above.<br>
<br>
To compare pixel intensities of 2 slice windows center and width must be the<br>
same. A normalization is required.<br>
<br>
Could you suggest me how to change windows center and width ?<br>
<br>
Thanks<br>
<br>
BR<br>
<br>
Roberto<br>
<br>
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