hash the pixels of a DICOM file

hash_dcm.py

# /// script
# requires-python = ">=3.14"
# dependencies = [
#     "numpy>=2.4.6",
#     "pydicom>=3.0.2",
#     "xxhash>=3.7.0",
# ]
# ///
import sys

# from hashlib import sha256 as Hash
from pydicom.pixels import pixel_array
from xxhash import xxh3_64 as Hash


def main(fn):
    try:
        bs = pixel_array(fn).tobytes()
        if not bs:
            return "-"
        h = Hash()
        h.update(bs)
        return h.hexdigest()
    except Exception:
        return "-"


if __name__ == "__main__":
    hs = main(sys.argv[1])
    print(hs)