`read_dicom_auto` can return any one of `(Scan | PET | StructureSet | Dose | Segmentation | None)`

[strixy16]

          `read_dicom_auto` can return any one of `(Scan | PET | StructureSet | Dose | Segmentation | None)`

for baseImage I'm assuming it should must return a Scan type?
reason:

the baseImage.image will only work if baseImage is of type Scan, and we can provide better logging/error handling

segMasks = makeMask(
    segImage,
    baseImage.image,
    existing_roi_indices={"background": 0},
    ignore_missing_regex=False,
)

if so, should verify this type before proceeding with something like:

from imgtools.modules import scan
...
baseImage = read_dicom_auto(baseImageDirPath)
assert isinstance(baseImage, scan.Scan), f"baseImage is not a Scan object. has type {type(baseImage)}"

or something

Originally posted by @jjjermiah in #31 (comment)

[strixy16]

Should update to read_dicom_scan as this step is meant to load CT or MR and that's the specific function for that.

[jjjermiah]

closed by #42