Overview
ISO/TS 22077-5:2021 - "Health informatics - Medical waveform format - Part 5: Neurophysiological signals" defines a heterogeneous, interoperable format for storing and exchanging neurophysiological waveform signals. The Technical Specification focuses on electroencephalography (EEG) waveforms recorded during EEG examinations and makes specific provision for polysomnography (PSG), brain‑death determination, evoked potentials (EP), and electromyography (EMG). The specification enables recording of multiple waveform types in a single persistent record package and supports time synchronization and parametric data needed for clinical interpretation.
Key topics and technical requirements
- MFER-based encoding: Builds on Medical waveform Format Encoding Rules (MFER) and ISO 22077‑1 encoding rules, using a tag‑length‑value (TLV) structure for header and waveform data.
- Waveform classes and attributes: Defines waveform classes for EEG, PSG, EP, EMG and associated lead/waveform attributes (lead names) to standardize semantic representation.
- Sampling and frame attributes: Specifies sampling-related attributes (e.g., sampling rate and sampling resolution - MWF_IVL and MWF_SEN codes appear in the specification) and frame-level metadata to ensure accurate signal reconstruction.
- Time synchronization: Supports alignment of multiple signals and parametric data across the examination period so clinicians can assess temporal relationships.
- Event information and measurement status: Standardizes event markers, status information, and related metadata needed for clinical reporting and analysis.
- Supporting material: Includes conformance guidance and informative annexes with EEG electrode codes and example waveform encodings to aid implementation.
Practical applications and users
ISO/TS 22077-5:2021 is intended for neurophysiology contexts where reliable, interoperable waveform handling is required:
- Clinical providers and sleep labs: For storage and exchange of EEG/PSG studies and synchronized respiratory/oximetry channels.
- Medical device manufacturers: To implement standardized output formats for EEG/EMG/EP recording systems.
- Health IT and EHR integrators: To ingest and present waveform packages alongside clinical documents.
- Software developers and analytics vendors: To build viewers, analysis tools, and research pipelines that consume raw waveforms with complete metadata.
- Regulatory and standards bodies: For validation, conformance, and harmonization of waveform data exchange.
Benefits include improved interoperability, consistent preservation of raw waveform data with detailed recording parameters, and simplified translation from other waveform formats for both clinical use and research.
Related standards
- ISO 22077‑1:2015 - MFER encoding rules (core encoding)
- ISO/TS 22077‑3:2015 - Long term electrocardiography (related waveform part)
- Complementary standards often used together: HL7, DICOM, IEEE (for demographic, imaging, and broader health‑IT integration)
Keywords: ISO/TS 22077-5:2021, MFER, EEG, neurophysiological signals, polysomnography, EMG, evoked potentials, waveform encoding, interoperability, time synchronization.