help > Window Width and Window Center Value of DICOM images not considered while converting dcm to nii
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Sep 10, 2019 11:09 PM | Utsav Shrestha - The University of Memphis
Window Width and Window Center Value of DICOM images not considered while converting dcm to nii
I am trying to convert dicom CT images of brain to nii but the
result of the conversion is a plain brain images where the details
of the images (such as ventricles and grey matters) are all grayed
out/hidden. I have attached a screenshot of a slice of the original
DICOM image and the converted nii image.
But, when I adjust the window/level value of the converted nii image the details of the image are visible again. I think the conversion is not considering window width and window center value present in DICOM tags of the original dcm images.
How can I include the window width and window center for the conversion?
Thanks!
But, when I adjust the window/level value of the converted nii image the details of the image are visible again. I think the conversion is not considering window width and window center value present in DICOM tags of the original dcm images.
How can I include the window width and window center for the conversion?
Thanks!
Sep 11, 2019 02:09 PM | Chris Rorden
RE: Window Width and Window Center Value of DICOM images not considered while converting dcm to nii
Your image has far more dynamic range than the screen. Set the
image intensity minimum and maximum to highlight the tissues you
are interested in. CT scans are saved as Hounsfield units, with the
intensity of air very dark (-1000), soft-tissue and water in the
range 0-50 and bone very bright (+1000). On option is to just set
the "min" and "max" values for the window values you desire.
Alternatively, right-drag your mouse over the area of the image you
are interested in and it will adjust the contrast to what you are
interested in.
If you are using [MRIcroGL](https://www.nitrc.org/plugins/mwiki/inde...) you can select one of the "CT" color schemes. The image below shows the CT_Abdo scan that comes with MRIcroGL (File/OpenStandard/CTAbdo) with both the initial intensity range and with the "CT_Kidneys" color scheme applied. Choose Scripting/Templates/ct_abdomen for a graphical demonstration.
If you are using [MRIcroGL](https://www.nitrc.org/plugins/mwiki/inde...) you can select one of the "CT" color schemes. The image below shows the CT_Abdo scan that comes with MRIcroGL (File/OpenStandard/CTAbdo) with both the initial intensity range and with the "CT_Kidneys" color scheme applied. Choose Scripting/Templates/ct_abdomen for a graphical demonstration.
Sep 11, 2019 10:09 PM | Utsav Shrestha - The University of Memphis
RE: Window Width and Window Center Value of DICOM images not considered while converting dcm to nii
Thank You for your response!