text: -- Name: CountRowsInDicomFileWithUnpopulatedPixelInfo
  -- Schema: posda_files
  -- Columns: ['count']
  -- Args: []
  -- Tags: ['adding_pixels_to_dicom_file']
  -- Description: count rows in dicom_file with unpopulated pixel info
  
  select 
   count(*) from dicom_file where has_pixel_data is null