dicom anonymization

4tolexx

Apr 25th, 2025

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# anonymization of dicom tags issue
* add deny or allow list of dicom tags to study configuration yml
* upon upload of study configuration remove list of dicom tags included in the deny list
* the removed list should not be part of the dicom metadata information
def apply_tag_deny_list!(dicom)
deny_list = study.locked_configuration.dig("filtered_dicom_tags", "deny_list") || []
all_tags = deny_list + ["0010,0010"]
all_tags.each do |tag|
tag_existed = dicom.exists?(tag)
dicom.delete_element(tag) if tag_existed
next unless tag_existed
original_attributes_seq = dicom[DICOM::Tag.OriginalAttributesSequence]
original_attributes_seq ||= DICOM::Sequence.new(DICOM::Tag.OriginalAttributesSequence, parent: dicom)
original_attributes = original_attributes_seq.add_item
original_attributes.add_element(
DICOM::Tag.AttributeModificationDateTime,
DateTime.now.utc.strftime("%Y%m%d%H%M%S.%6N")
)
original_attributes.add_element(DICOM::Tag.ModifyingSystem, "Pharmtrace ERICA SaaS #{ERICA.version}")
original_attributes.add_element(DICOM::Tag.ReasonForTheAttributeModification, "COERCE")
modified_attributes_seq = DICOM::Sequence.new(DICOM::Tag.ModifiedAttributesSequence, parent: original_attributes)
modified_attributes = modified_attributes_seq.add_item
modified_attributes.add_element(tag, "")
end
end

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