The following constants are used to indicate the Class Information Object Definitions.
| Code constant | Code value and meaning | 
|---|---|
| CLASS_12_LEAD_ECG | 12-Lead ECG | 
| CLASS_AMBULATORY_ECG | Ambulatory ECG | 
| CLASS_BASIC_ANNOTATION | Basic Annotation | 
| CLASS_BASIC_CARDIAC_EP | Basic Cardiac EP | 
| CLASS_BASIC_COLOR_IMAGE_BOX | Basic Color Image Box | 
| CLASS_BASIC_COLOR_PRINT_META | Basic Print Meta | 
| CLASS_BASIC_DIRECTORY | Basic Directory | 
| CLASS_BASIC_FILM_BOX | Basic Film Box | 
| CLASS_BASIC_FILM_SESSION | Basic Film Session | 
| CLASS_BASIC_GRAYSCALE_IMAGE_BOX | Basic Grayscale Image Box | 
| CLASS_BASIC_GRAYSCALE_PRINT_META | Basic Print Meta | 
| CLASS_BASIC_IMAGE_BOX | Basic Image Box | 
| CLASS_BASIC_PRINT_IMAGE_OVERLAY_BOX | Basic print image overlay box. | 
| CLASS_BASIC_STUDY_DESCRIPTOR | Basic Study Descriptor | 
| CLASS_BASIC_TEXT_SR | Basic Text Structured Reporting | 
| CLASS_BASIC_VOICE_AUDIO | Basic Voice Audio | 
| CLASS_CHEST_CAD_SR | Chest CAD SR | 
| CLASS_COMPREHENSIVE_SR | Comprehensive Structured Reporting | 
| CLASS_CR_IMAGE_STORAGE | Computed Radiography Image | 
| CLASS_CT_IMAGE_STORAGE | Computed Tomography Image | 
| CLASS_DX_IMAGE_STORAGE_PRESENTATION | Digital X-ray image presentation. | 
| CLASS_DX_IMAGE_STORAGE_PROCESSING | Digital X-ray image processing. | 
| CLASS_DX_INTRAORAL_IMAGE_STORAGE_PRESENTATION | Digital X-ray Intraoral image presentation. | 
| CLASS_DX_INTRAORAL_IMAGE_STORAGE_PROCESSING | Digital X-ray Intraoral image processing. | 
| CLASS_DX_MAMMOGRAPHY_IMAGE_STORAGE_PRESENTATION | Digital X-ray Mammography image presentation. | 
| CLASS_DX_MAMMOGRAPHY_IMAGE_STORAGE_PROCESSING | Digital X-ray Mammography image processing. | 
| CLASS_ENHANCED_MR_IMAGE_STORAGE | Enhanced MR Image Storage | 
| CLASS_ENHANCED_SR | Enhanced Structured Reporting | 
| CLASS_GENERAL_ECG | General ECG | 
| CLASS_GENERAL_PURPOSE_PERFORMED_PROCEDURE_STEP | General Purpose Performed Procedure Step | 
| CLASS_GENERAL_PURPOSE_SCHEDULED_PROCEDURE_STEP | General Purpose Scheduled Procedure Step | 
| CLASS_GENERAL_PURPOSE_WORKLIST | General Purpose Worklist | 
| CLASS_GENERAL_PURPOSE_WORKLIST_MANAGEMENT_META | General Purpose Worklist Management Meta | 
| CLASS_GRAYSCALE_SOFTCOPY_PRESENTATION_STATE | Grayscale Softcopy Presentation State | 
| CLASS_HC_COLOR_IMAGE_STORAGE | Hardcopy Color Image | 
| CLASS_HC_GRAYSCALE_IMAGE_STORAGE | Hardcopy Grayscale Image | 
| CLASS_HEMODYNAMIC | Hemodynamic | 
| CLASS_IMAGE_OVERLAY_BOX_RETIRED | Image Overlay Box (Retired) | 
| CLASS_INTERPRETATION | Interpretation | 
| CLASS_KEY_OBJECT_SELECTION_DOCUMENT | Key Object Selection Document | 
| CLASS_MAMMOGRAPHY_CAD_SR | Mammography CAD SR | 
| CLASS_MAX | Maximum number of classes. | 
| CLASS_MODALITY_PERFORMED_PROCEDURE_STEP | Modality Performed Procedure Step | 
| CLASS_MODALITY_WORKLIST | Modality Worklist | 
| CLASS_MR_IMAGE_STORAGE | Magnetic Resonance Image | 
| CLASS_MR_SPECTROSCOPY_STORAGE | MR Spectroscopy Storage | 
| CLASS_NM_IMAGE_STORAGE | Nuclear Medicine Image | 
| CLASS_NM_IMAGE_STORAGE_RETIRED | Nuclear Medicine Image (Retired) | 
| CLASS_OPHTHALMIC_8_BIT_PHOTOGRAPHY_IMAGE_STORAGE | Ophthalmic Photography 8 Bit Image Storage | 
| CLASS_OPHTHALMIC_16_BIT_PHOTOGRAPHY_IMAGE_STORAGE | Ophthalmic Photography 16 Bit Image Storage | 
| CLASS_PATIENT | Patient | 
| CLASS_PATIENT_META | Patient Meta | 
| CLASS_PATIENT_ROOT_QUERY_IMAGE | Patient root query image. | 
| CLASS_PATIENT_ROOT_QUERY_PATIENT | Patient root query patient. | 
| CLASS_PATIENT_ROOT_QUERY_SERIES | Patient root query series. | 
| CLASS_PATIENT_ROOT_QUERY_STUDY | Patient root query study. | 
| CLASS_PATIENT_STUDY_QUERY_PATIENT | Patient study query patient. | 
| CLASS_PATIENT_STUDY_QUERY_STUDY | Patient study query study. | 
| CLASS_PET_IMAGE_STORAGE | Positron Emission Tomography Image | 
| CLASS_PRESENTATION_LUT | Presentation LUT | 
| CLASS_PRINT_JOB | Print Job | 
| CLASS_PRINT_QUEUE | Print Queue | 
| CLASS_PRINTER | Printer | 
| CLASS_PRINTER_CONFIGURATION | Printer configuration. | 
| CLASS_PULL_PRINT_REQUEST | Pull Print Request | 
| CLASS_PULL_STORED_PRINT_META | Pull Stored Print Meta | 
| CLASS_RAW_DATA_STORAGE | Raw Data Storage | 
| CLASS_REFERENCED_COLOR_PRINT_META_RETIRED | Referenced Print Meta (Retired) | 
| CLASS_REFERENCED_GRAYSCALE_PRINT_META_RETIRED | Referenced Print Meta (Retired) | 
| CLASS_RESULTS | Results | 
| CLASS_RESULTS_META | Results Meta | 
| CLASS_RT_BEAMS_TREATMENT_RECORD_STORAGE | Radiotherapy Beams Treatment Record. | 
| CLASS_RT_BRACHY_TREATMENT_RECORD_STORAGE | Radiotherapy Brachy Treatment Record. | 
| CLASS_RT_DOSE_STORAGE | Radiotherapy Dose | 
| CLASS_RT_IMAGE_STORAGE | Radiotherapy Image | 
| CLASS_RT_PLAN_STORAGE | Radiotherapy Plan | 
| CLASS_RT_STRUCTURE_SET_STORAGE | Radiotherapy Structure Set | 
| CLASS_RT_TREATMENT_SUMMARY_RECORD_STORAGE | Radiotherapy Treatment Summary Record. | 
| CLASS_SC_IMAGE_STORAGE | Secondary Capture Image | 
| CLASS_SC_MULTI_FRAME_GRAYSCALE_BYTE_IMAGE_STORAGE | Secondary Capture Multi-frame Grayscale Byte Image Storage | 
| CLASS_SC_MULTI_FRAME_GRAYSCALE_WORD_IMAGE_STORAGE | Secondary Capture Multi-frame Grayscale Word Image Storage | 
| CLASS_SC_MULTI_FRAME_SINGLE_BIT_IMAGE_STORAGE | Secondary Capture Multi-frame Single Bit Image Storage | 
| CLASS_SC_MULTI_FRAME_TRUE_COLOR_IMAGE_STORAGE | Secondary Capture Multi-Frame True Color Image Storage | 
| CLASS_STANDALONE_CURVE_STORAGE | Standalone Curve | 
| CLASS_STANDALONE_MODALITY_LUT_STORAGE | Standalone Modality LUT | 
| CLASS_STANDALONE_OVERLAY_STORAGE | Standalone Overlay | 
| CLASS_STANDALONE_PET_CURVE_STORAGE | Standalone Positron Emission Tomography Curve | 
| CLASS_STANDALONE_VOI_LUT_STORAGE | Standalone VOI LUT | 
| CLASS_STEREOMETRIC_RELATIONSHIP_STORAGE | Stereometric Relationship Storage | 
| CLASS_STORAGE_COMMITMENT_PULL_MODEL | Storage Commitment | 
| CLASS_STORAGE_COMMITMENT_PUSH_MODEL | Storage Commitment | 
| CLASS_STORED_PRINT_STORAGE | Stored Print | 
| CLASS_STUDY | Study | 
| CLASS_STUDY_COMPONENT | Study Component | 
| CLASS_STUDY_META | Study Meta | 
| CLASS_STUDY_ROOT_QUERY_IMAGE | Study root query image. | 
| CLASS_STUDY_ROOT_QUERY_SERIES | Study root query series. | 
| CLASS_STUDY_ROOT_QUERY_STUDY | Study root query study. | 
| CLASS_UNKNOWN | Unknown | 
| CLASS_US_IMAGE_STORAGE | Ultrasound Image | 
| CLASS_US_IMAGE_STORAGE_RETIRED | Ultrasound Image (Retired) | 
| CLASS_US_MULTI_FRAME_IMAGE_STORAGE | Ultrasound Multi-frame Image | 
| CLASS_US_MULTI_FRAME_IMAGE_STORAGE_RETIRED | Ultrasound Multi-frame Image (Retired) | 
| CLASS_VISIT | Visit | 
| CLASS_VL_ENDOSCOPIC_IMAGE_STORAGE | Visible Light Endoscopic image. | 
| CLASS_VL_MICROSCOPIC_IMAGE_STORAGE | Visible Light Microscopic image. | 
| CLASS_VL_PHOTOGRAPHIC_IMAGE_STORAGE | Visible Light Photographic image. | 
| CLASS_VL_SLIDE_COORDINATES_MICROSCOPIC_IMAGE_STORAGE | Visible Light slide coordinates for a Microscopic image. | 
| CLASS_VOI_LUT_BOX_RETIRED | VOI LUT Box (Retired) | 
| CLASS_XA_BIPLANE_IMAGE_STORAGE_RETIRED | X-Ray Angiographic Bi-Plane Image (Retired) | 
| CLASS_XA_IMAGE_STORAGE | X-Ray Angiographic Image | 
| CLASS_XRF_IMAGE_STORAGE | X-Ray Radiofluoroscopic Image |