[Insight-users] GDCMSeriesFileNames with growing SeriesUIDs when rescanning the same directory

[Thomas Lambertz]

Hello,

after spending too much time on debugging i need your help in the 
correct use of GDCMSeriesFileNames.

I am sure this belongs to a misunderstanding of the concept of GDCM by 
myself - so hopefully someone is so kind to enlight me. I used the 
following two methods to get the SeriesUIDs from the files within a 
given directory.

int cGDCMInfo::SetDir(std::string *Directory)
{
    try {
        FileNames->SetUseSeriesDetails( true );
        FileNames->AddSeriesRestriction("0008|0021");
        FileNames->SetDirectory( Directory->c_str() );
    }
    catch( itk::ExceptionObject & excep )
    {
        std::string message = excep.GetDescription();
        DebugCallback(message);
        return ERROR;
    }
    return OK;
}


int cGDCMInfo::GetSeriesUIDs(SeriesUIDContainer *SeriesUIDs)
{
    try {
        SeriesUIDs->clear();
        *SeriesUIDs = FileNames->GetSeriesUIDs();

        // for debug only
        for(int i=0;i<SeriesUIDs->size();i++) {
            DebugCallback(SeriesUIDs->at(i));
        }
    }
    catch( itk::ExceptionObject & excep )
    {
        std::cout << excep;
        return ERROR;
    }
    return OK;
}

This seemes to work - until i allow the user to reselect the same 
directory for a second run.

sample SeriesUIDs from within a loop over the same directory:
1.3.12.2.1107.5.8.2.485257.837553.68678254.200601060732283653512512200601065351251220060106
1.3.12.2.1107.5.8.2.485257.837553.68678254.2006010607322836535125122006010653512512200601065351251220060106
1.3.12.2.1107.5.8.2.485257.837553.68678254.20060106073228365351251220060106535125122006010653512512200601065351251220060106
1.3.12.2.1107.5.8.2.485257.837553.68678254.200601060732283653512512200601065351251220060106535125122006010653512512200601065351251220060106

for(int i=0;i<4;i++) {
    DirInfo->SetDir(&plandir);
    DirInfo->GetSeriesUIDs(&UID);
}

Obviously there is allways the same block inserted each time i rescan 
the directory. Why is it so - and how can i prevent this behaviour ? 
This only happens when i re-used SetDir(). What i expected was that with 
each run i get the same UIDs. Is this a wrong assumption ?

I used the seriesUID internally to remember which series is to load next 
time. But when the SeriesUIDs changes there are consequently no files 
that belong to the then older SeriesUID - and the import failed.

Your help is very appreciated !

Thanks in advance,
Tom