[vtkusers] why the DICOM image is completely white when I use lung color level and window?

[David Gobbi]

Hi Liu Peng,

It would be something like this:

ColorWindow = 1200/RescaleSlope
ColorLevel = (-600 - RescaleIntercept)/RescaleSlope

 - David

On Mon, Sep 4, 2017 at 10:11 PM, Liu_tj <tjlp at netease.com> wrote:

> Hi, David,
>
> So I need to convert the window and level value, 1200 and -600, by this
> mapping "ModalityValue = RescaleSlope * StoredValue + RescaleIntercept"
> before I call the vtkImageViewer2->SetColorLevel() and SetColorWindow()
> function, right?
>
> Thanks
> Liu Peng
>
>
>
> 在2017-09-05，"David Gobbi" <david.gobbi at gmail.com> 写道：
>
> -----原始邮件-----
> *发件人:*"David Gobbi" <david.gobbi at gmail.com>
> *发送时间:*2017年09月5日 星期二
> *收件人:*"Liu_tj" <tjlp at netease.com>
> *抄送:*"vtkusers" <vtkusers at vtk.org>
> *主题:*Re: [vtkusers] why the DICOM image is completely white when I use
> lung color level and window?
>
>
> Hi Liu Peng,
>
> Use the reader's GetRescaleSlope() and GetRescaleIntercept().  See
> http://dgobbi.github.io/vtk-dicom/doc/api/image_display.html and scroll
> down to the "Grayscale image display" section.
>
> For a run-down on some of the complications of Window/Level in DICOM, see
> the following:
> http://dicom.nema.org/medical/dicom/current/output/chtml/
> part03/sect_C.11.html
> http://dicom.nema.org/medical/dicom/current/output/chtml/
> part03/sect_C.11.2.html
>
>  - David
>
> On Mon, Sep 4, 2017 at 8:18 AM, Liu_tj <tjlp at netease.com> wrote:
>
>> Hi,
>>
>> I use vtkImageViewer2 to display DICOM series. If I set the lung color
>> level and window, which is -600 and 1200, to the vtkImageViewer2, the image
>> is completely white.
>>
>> If I use other DICOM browser tool, with the same level and window, the
>> DICOM is displayed correclty.
>>
>> What's wrong with the level and window setting to vtkImageViewer2?
>>
>> Thanks
>>
>> Liu Peng
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20170905/c96fed4b/attachment.html>