Available in LEADTOOLS Medical Imaging toolkits.
Dicom Annotations: Text Objects
LDicomDS::CreateTextObject
LDicomDS::GetTextObjectCount
LDicomDS::GetTextObjectInfo
LDicomDS::GetTextObjElement
LDicomDS::RemoveAllTextObjects
LDicomDS::RemoveTextObject
LDicomDS::SetTextObjectInfo