[vtkusers] how to use vtkDICOMImageReader

[qingzhen]

    I took vtkDICOMImageReader to read my CT,MRI datasets,but it always gone wrong like"No DICOM magic number found, but file appears to be DICOM" .Authough I think it really is DICOM datasets.Can anynone give me a example about"vtkDICOMImageReader"?
    
   Another question:
"vtkVolumeRayCastMapper (0x08DEF060): Cannot volume render data of type short, only unsigned char or unsigned short."  How can I let my raw CT datasets to be "unsigned char or unsigned short"? 

  
    Best Regards，
        
            
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