docs: def get_stats_of_series_in_dir(self, study_id=None):
          """ Dicom series staticstics, input is dcmdir, not dirpath
          Information is generated from dicomdir.pkl and first files of series
          """
          if study_id is not None:
              logger.error("study_id tag is not implemented yet")
              return
          import numpy as np
          dcmdir = self.files_with_info
          # get series number
          # vytvoření slovníku, kde je klíčem číslo série a hodnotou jsou všechny
          # informace z dicomdir
          series_info = {line['SeriesNumber']: line for line in dcmdir}
  
          # počítání velikosti série
          try:
              dcmdirseries = [line['SeriesNumber'] for line in dcmdir]
  
          except:
              logger.debug('Dicom tag SeriesNumber not found')
              series_info = {0: {'Count': 0}}
              return series_info
              # eturn [0],[0]
  
          bins, counts = np.unique(dcmdirseries, return_counts=True)
  
          # sestavení informace o velikosti série a slovníku
  
          for i in range(0, len(bins)):
              series_info[bins[i]]['Count'] = counts[i]
  
              # adding information from files
              lst = self.get_sorted_series_files(series_number=bins[i])
              metadata = self.get_metaData(dcmlist=lst, series_number=bins[i])
              # adding dictionary metadata to series_info dictionary
              series_info[bins[i]] = dict(
                  list(series_info[bins[i]].items()) +
                  list(metadata.items())
              )
  
          return series_info