introduce custom dicom filetype and make scaling of images optional

mu_map/file/dicom.py

@@ -4,6 +4,7 @@ from typing import Tuple
 import numpy as np
 import pydicom
 
+dcm_type = pydicom.dataset.FileDataset
 
 """
 Since DICOM images only allow images stored in short integer format,
@@ -37,7 +38,10 @@ def load_dcm(filename: str) -> Tuple[pydicom.dataset.FileDataset, np.ndarray]:
     :return: the dicom header and the scaled image as a numpy array
     """
     dcm = pydicom.dcmread(filename)
-    image = dcm.pixel_array / dcm[DCM_TAG_PIXEL_SCALE_FACTOR].value
+    if DCM_TAG_PIXEL_SCALE_FACTOR in dcm:
+        image = dcm.pixel_array / dcm[DCM_TAG_PIXEL_SCALE_FACTOR].value
+    else:
+        image = dcm.pixel_array
     return dcm, image