Can't use DICOM data to reconstruct 3D model

Support
1

I follow the tuturrial in https://kitware.github.io/vtk-examples/site/Cxx/Medical/MedicalDemo2/
I got the right result.
But when I change the Reader from vtkMetaImageReader to vtkDICOMImageReader.
The output is just a outline box without model as below.
image

DICOM I used can be show in ImageViewer2, so is there some other thing should be done when I use DICOMReader to extract surface?

image
the ImageViewer2 result

PS: the DICOM data serial I use has no metedata file.

2

I solved it!
the new dicom file I use have a different value range.
As I use the range in (0,500), all noise point is included.
So the output model is down.
Use a range of (0,200) solve it.