[Insight-users] DICOM WINDOW CENTER AND WIDTH

Wed Jan 4 01:02:01 EST 2012

Hi Wes.

So, if I use the function "getpixel" I'll get an absolute value (not
related to 0028|1050 and 0028|1051).

Could you confirm it?

br

roberto

Il giorno 02/gen/2012 19.13, "Wes Turner" <wes.turner at kitware.com> ha
scritto:

> Roberto,
>
> I believe 0028|1050 and 0028|1051 are display only parameters and only
> impact how bright a given pixel value appears.  I do not believe that they
> actually specify modifications to the pixel values.  They are not binding
> on the viewer and almost any software for viewing DICOM images will allow
> you to interactively change the actual display settings used, but again,
> that does not translate into an actual change in the pixel value, only how
> bright a given value appears.
>
> - Wes
>
> On Fri, Dec 30, 2011 at 12:51 PM, Martijn Steenwijk <
> martijnsteenwijk at gmail.com> wrote:
>
>> Hi Roberto,
>>
>> Can you supply some information about the scanner manufacturer and
>> sequences? Were both slices acquired in the same series?
>>
>> Best,
>> Martijn
>>
>> -----Oorspronkelijk bericht-----
>> Van: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org]
>> Namens Fleysher, Lazar
>> Verzonden: vrijdag 30 december 2011 15:53
>> Aan: Roberto Laurita
>> CC: insight-users at itk.org
>> Onderwerp: Re: [Insight-users] DICOM WINDOW CENTER AND WIDTH
>>
>> Dear Roberto
>>
>> I am not familiar with the meaning of "window center" and "window width"
>> so
>> cannot help you there, but as I mentined earlier, when two different
>> acquisitions are made, you have to worry about other things.
>> You really have to know what your particular system does. there are other
>> factors involved which may not be even stored in DICOM... :( These factors
>> are receiver gain, some other scale factors which manufacturer decided to
>> put in .... yes yes... You have to force the system to operate under
>> identical conditions in two cases. Probably you did that, but I thought I
>> would mention it anyway.
>>
>> Lazar
>> ________________________________
>> From: Roberto Laurita [roberto.laurita at gmail.com]
>> Sent: Thursday, December 29, 2011 07:30
>> To: Fleysher, Lazar
>> Cc: insight-users at itk.org
>> Subject: Re: [Insight-users] DICOM WINDOW CENTER AND WIDTH
>>
>> 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<mailto: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<mailto:insight-users-bounces at itk.org>
>> [insight-users-bounces at itk.org<mailto:insight-users-bounces at itk.org>] on
>> behalf of roberto.laurita
>> [roberto.laurita at gmail.com<mailto:roberto.laurita at gmail.com>]
>> Sent: Wednesday, December 28, 2011 17:57
>> To: insight-users at itk.org<mailto: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<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<http://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
>>
>> _____________________________________
>> 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
>>
>> _____________________________________
>> 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
>>
>
>
>
> --
> Wesley D. Turner, Ph.D.
> Kitware, Inc.
> Technical Leader
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4920
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20120104/b7f888f6/attachment-0001.htm>