ISO 22077-1:2022 pdf – Health informatics — Medical waveform format — Part 1: Encoding rules.
1 Scope This document specifies how medical waveforms, such as electrocardiogram, electroencephalogram, spirometry waveform, etc., are described for interoperability among healthcare information systems. This document can be used with other relevant protocols, such as HL7, DICOM®, the ISO/IEEE 11073 series, and database management systems for each purpose. This is a general specification, so specifications for particular waveform types and for harmonization with DICOM®, SCP-ECG, X73, etc. are not given. This document does not include lower layer protocols for message exchange. For example, a critical real-time application such as a patient monitoring system is out of scope and this is an implementation issue. 2 Normative references There are no normative references in this document. 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminology databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso .org/obp — IEC Electropedia: available at https://www.electropedia .org/ 3.1.1 frame waveform (3.1.5 ) encoding unit consisting of data blocks, channels (3.1.4) and sequences Note 1 to entry: The frame in this document is the same as waveform frame. 3.1.2 medical waveform time sequential data that are sampled by an A/D converter or transmitted from medical equipment 3.1.3 sampling data that are converted at a fixed time interval Note 1 to entry: The sampling in this document is the same as waveform sampling.
3.1.4 channel individual waveform ( 3.1.5 ) data group Note 1 to entry: The channel in this document is the same as waveform channel. 3.1.5 waveform graph showing a change in some physical quantity with time 3.2 Abbreviated terms A/D ECG EEG GPS HL7 DICOM® IEEE IEC JIS LSB MFER OID SCP-ECG SpO 2 UID UUID VCG analogue to digital electrocardiogram electroencephalogram global positioning system Health Level Seven Digital Imaging and Communications in Medicine Institute of Electrical and Electronic Engineers International Electrotechnical Commission Japanese Industrial Standard least significant bit medical waveform format encoding rules object identifier Standard Communications Protocol for Computerized Electrocardiography (see EN 1064) saturation of peripheral oxygen unique identifier universally unique identifier vectorcardiogram 4 Basic specifications 4.1 Basic attributes 4.1.1 General Medical waveform data described in accordance with the MFER consists of sampling attributes (see Figure 1), frame attributes (see Figure 2 ) and other supplemental information.
220.127.116.11 When the data length is 0 “Data length 0 ” indicates that the definition indicated by tag resets to the default value. Namely, on the root definition, the concerned items re-initialize to default values, and in cases of the channel definition, the channel definition is re-initialized to the root definition. 4.2.4 Value (V) The header or waveform data values are encoded in the value section according to descriptors specified by the tag. 4.3 Encoding principle 4.3.1 General All definitions in MFER have default values, so any additional or amended definitions are optional. Thus, the definition corresponding to each tag has a default value, so re-definition is not necessary if the default value is retained. It is expected that default definitions will suffice for most purposes. 4.3.2 Definition levels 18.104.22.168 Level 1 — Basic definitions Definitions at level 1 are basic definitions, which are ordinary rules (marked with an asterisk) and ensure precise encoding. 22.214.171.124 Level 2 — Supplementary definitions Definitions at level 2 are supplementary definitions. They may be used as required but it is desirable to associate the supplementary definitions with a host protocol where they can be defined with the host protocol. 126.96.36.199 Level 3 — Extended definitions Definitions at level 3 are extended definitions, which should be used as little as possible. Items of these extended definitions can considerably affect the system with regard to security. Thus, great care should be taken when using them. 4.3.3 General principles in interpretation, scope and priority of definitions