[Insight-users] DICOM WINDOW CENTER AND WIDTH

[Roberto Laurita]

Hi Martijn,
i'm abroad this week and so, before saturday I cannot supply the
manufacturer info.

I'm sure that the slices where acquired in the same series.

I used a phantom, so i can supply the slices.

Thanks

br

roberto

Il giorno 30/dic/2011 19.51, "Martijn Steenwijk" <martijnsteenwijk at gmail.com>
ha scritto:

> 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
>
> --
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