IDENTIFIERS = [
    "PatientName",
    "PatientID",
    "PatientBirthDate",
    "PatientSex",
    "InstitutionName",
    "ReferringPhysicianName",
    "StudyDate",
    "StudyTime",
    "AccessionNumber"
]

for tag in IDENTIFIERS:
    if tag in ds:
        ds[tag].value = ""

# Records that an identity-removal process was performed.
# This field alone does not make the dataset de-identified.
ds.PatientIdentityRemoved = "YES"