version description donor_id tissue_id execution_datetime protocols_io_doi operator operator_email pi pi_email assay_category assay_type analyte_class is_targeted acquisition_instrument_vendor acquisition_instrument_model preparation_instrument_vendor preparation_instrument_model section_prep_protocols_io_doi reagent_prep_protocols_io_doi number_of_channels ablation_distance_between_shots_x_value ablation_distance_between_shots_x_units ablation_distance_between_shots_y_value ablation_distance_between_shots_y_units ablation_frequency_value ablation_frequency_unit roi_description roi_id acquisition_id dual_count_start max_x_width_value max_x_width_unit max_y_height_value max_y_height_unit segment_data_format signal_type data_precision_bytes antibodies_path contributors_path data_path 1 mass_spectrometry_imaging Imaging Mass Cytometry protein um / nm um / nm Hz um um float / integer / string dual count / pulse count / intensity value