1. Section
     DICOM Object Catalog Section - DCM 121181 (2.16.840.1.113883.10.20.6.1.1)
    1. Entry
       Study Act (2.16.840.1.113883.10.20.6.2.6)
      1. Entry
         Series Act (2.16.840.1.113883.10.20.22.4.63)
        1. Entry
           SOP Instance Observation (2.16.840.1.113883.10.20.6.2.8)
          1. Entry
             Purpose of Reference Observation (2.16.840.1.113883.10.20.6.2.9)
          2. Entry
             Referenced Frames Observation (2.16.840.1.113883.10.20.6.2.10)
            1. Entry
               Boundary Observation (2.16.840.1.113883.10.20.6.2.11)