<p>Hi Martijn,<br>
i'm abroad this week and so, before saturday I cannot supply the manufacturer info.</p>
<p>I'm sure that the slices where acquired in the same series.</p>
<p>I used a phantom, so i can supply the slices.</p>
<p>Thanks</p>
<p>br</p>
<p>roberto</p>
<p>Il giorno 30/dic/2011 19.51, "Martijn Steenwijk" <<a href="mailto:martijnsteenwijk@gmail.com">martijnsteenwijk@gmail.com</a>> ha scritto:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Roberto,<br>
<br>
Can you supply some information about the scanner manufacturer and<br>
sequences? Were both slices acquired in the same series?<br>
<br>
Best,<br>
Martijn<br>
<br>
-----Oorspronkelijk bericht-----<br>
Van: <a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a> [mailto:<a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a>]<br>
Namens Fleysher, Lazar<br>
Verzonden: vrijdag 30 december 2011 15:53<br>
Aan: Roberto Laurita<br>
CC: <a href="mailto:insight-users@itk.org">insight-users@itk.org</a><br>
Onderwerp: Re: [Insight-users] DICOM WINDOW CENTER AND WIDTH<br>
<br>
Dear Roberto<br>
<br>
I am not familiar with the meaning of "window center" and "window width" so<br>
cannot help you there, but as I mentined earlier, when two different<br>
acquisitions are made, you have to worry about other things.<br>
You really have to know what your particular system does. there are other<br>
factors involved which may not be even stored in DICOM... :( These factors<br>
are receiver gain, some other scale factors which manufacturer decided to<br>
put in .... yes yes... You have to force the system to operate under<br>
identical conditions in two cases. Probably you did that, but I thought I<br>
would mention it anyway.<br>
<br>
Lazar<br>
________________________________<br>
From: Roberto Laurita [<a href="mailto:roberto.laurita@gmail.com">roberto.laurita@gmail.com</a>]<br>
Sent: Thursday, December 29, 2011 07:30<br>
To: Fleysher, Lazar<br>
Cc: <a href="mailto:insight-users@itk.org">insight-users@itk.org</a><br>
Subject: Re: [Insight-users] DICOM WINDOW CENTER AND WIDTH<br>
<br>
Hi Lazar,<br>
<br>
thank you for the answer.<br>
<br>
It's better to supply more details. I have 1 slice acquired 2 times with a<br>
different TR. So I have 2 dicom files.<br>
Reading the headers of these 2 files I found different values of "window<br>
center" and "window width". The MRI scanner provided 2 couples of values for<br>
rendering reason.<br>
<br>
I'd like to know if it's possible to set "window center" and "window width"<br>
in the second file the same values of the first one. I need to compare the<br>
intensities (with different TR) of the same pixel<br>
<br>
I thought about manual rescaling, but ...... if there is a better way ......<br>
<br>
Thanks again<br>
<br>
Ciao<br>
<br>
Roberto<br>
<br>
<br>
2011/12/29 Fleysher, Lazar<br>
<<a href="mailto:lazar.fleysher@mountsinai.org">lazar.fleysher@mountsinai.org</a><mailto:<a href="mailto:lazar.fleysher@mountsinai.org">lazar.fleysher@mountsinai.org</a>>><br>
Hello Roberto<br>
<br>
If I understood you correctly, you are asking how to convert from pixel<br>
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<br>
hardware-related<br>
parameters might be at play which might contribute to scaling. It depends on<br>
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><mailto:<a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a>><br>
[<a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a><mailto:<a href="mailto:insight-users-bounces@itk.org">insight-users-bounces@itk.org</a>>] on<br>
behalf of roberto.laurita<br>
[<a href="mailto:roberto.laurita@gmail.com">roberto.laurita@gmail.com</a><mailto:<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><mailto:<a href="mailto:insight-users@itk.org">insight-users@itk.org</a>><br>
Subject: [Insight-users] DICOM WINDOW CENTER AND WIDTH<br>
<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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