// 0020 000d UI 1 Study Instance UID
// 0020 000e UI REL Series Instance UID
std::string series_uid_ref = fileRef->GetEntryString(0x0020, 0x000e);
// 0020 0052 UI 1 Frame of Reference UID
std::string frame_uid_ref = fileRef->GetEntryString(0x0020, 0x0052);
// 0020 0032 DS 3 Image Position (Patient)
// 0020 000d UI 1 Study Instance UID
// 0020 000e UI REL Series Instance UID
std::string series_uid_ref = fileRef->GetEntryString(0x0020, 0x000e);
// 0020 0052 UI 1 Frame of Reference UID
std::string frame_uid_ref = fileRef->GetEntryString(0x0020, 0x0052);
// 0020 0032 DS 3 Image Position (Patient)