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

[Liu_tj]

Hi,David,

Thanks. That works.

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


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
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