@type t() :: %HL7v2.Segment.IPC{
  accession_identifier: term(),
  extra_fields: term(),
  modality: term(),
  protocol_code: term(),
  requested_procedure_id: term(),
  scheduled_ae_title: term(),
  scheduled_procedure_step_id: term(),
  scheduled_procedure_step_location_list: term(),
  scheduled_station_name: term(),
  study_instance_uid: term()
}