[IGSTK-Users] Problem reading DICOM CT images

[Andinet Enquobahrie]

Torleif Sandnes wrote:

> Hi.
>
> I can successfully load the CT images in IGSTKDir/Testing/Data/Input,  
> except from the E000192Mod set. For this DICOM series the  
> CTImageReader responds with the event "DICOMImageReadingErrorEvent".
> This also happens for some of the DICOM series I have at my  
> locations, but not all.
>
> Does anybody know if there are any limitations to the  
> DICOMImageReaders in igstk?
> Can anybody confirm that igstk::CTImageReader fails when trying to  
> load E000192Mod?
>
> I also have some CT series that have been edited in Osirix, (http:// 
> sourceforge.net/projects/osirix/). These seem to be tagged with the  
> modality SC and also fail to load with igstk::CTImageReader. How does  
> the CTImageReader handle series of this modality? AFAICS,  
> CTImageReader *only* handles CT series while all other modalities  
> will fail. If so, this poses a real problem for me as my application  
> must be able to load modified DICOM images.

Three situations can cause ImageReadingError Event  thrown

1)  Problem during the actual process in reading the data.  Exceptions 
thrown by
     the ITK image reader are caught and bundled into IGSTK image reader 
error..

2) Gantry tilt

The gantry tilt has to be less than a certain threshold. Otherwise error 
event will be
thrown.
 
3) Dicom image data has to be read by the correct DICOM image
     reader derived class

This means if you try to read MRI image using CTImageReader, it will fail.

 From your description, #3 could be the cause of your error.  When we 
designed the reader classes,
one thing we wanted to avoid  was handling tampered (modified) dicom 
images.  That is why we instituted
modality specific image readers.

>
> Regards,
> Torleif Sandnes
> Sintef Health Research
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>


-- 
==========================================================
Andinet A. Enquobahrie, PhD
R&D Engineer
Kitware Inc.

28 Corporate Drive
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Phone: 518-371-3971 x124
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