[vtkusers] DICOM pixel value is strange

[arwtyxouymz]

Hi,

I wrote the code to pick the DICOM pixel value, but pixel value is strange.
My code is below:

```
vtkSmartPointer<vtkImageData> image = reader->GetOutput();

int ijk[3];
double pcoords[3];

for (vtkIdType id = 0; id < image->GetNumberOfPoints(); ++id) {
        int check = image->ComputeStructuredCoordinates(image->GetPoint(id),
ijk, pcoords);
        cout << "ID: " << id << ", ";
        cout << "ijk: " << "(" << ijk[0] << ", " << ijk[1] << ", " << ijk[2]
<< "), ";
        auto *pixel = static_cast<double*>(image->GetScalarPointer(ijk));
        cout << "Pixel: " << *pixel << endl;
}
```

I supposed *pixel value is in the range 0 ~ 255, but actual output is like
-2.06898e+289.
Why?
Moreover, *pixel max value is 1.98914e-289, and sometimes *pixel is nan.
It's strange!!!

Can you help me?



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