Python wrapped itk.Image - What type to use for int

Beginner Questions
5

I got a similar issue with the following toy example

import itk                                                                           
from pydicom.data import get_testdata_files                                          
filename = get_testdata_files('CT_small.dcm')[0]                                     
img = itk.imread(filename) 

KeyError: 'itkTemplate : No template (<itkCType unsigned int>, 3) for the itk::Image class'

When opening with pydicom, the type is recognized as short (np.int16). What would be the reason to not support this type when opening with imread?