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European data format
European Data Format (EDF) is a standard file format designed for exchange and storage of medical time series. A few European medical engineers who first met at the 1987 international Sleep Congress in Copenhagen developed it. EDF was published in 1992. It is widely used for EEG and polysomnography recordings in commercial equipment and multicenter research projects.
Additional recommended knowledge
EDF stores multichannel data allowing different sample rates for each signal. Internally it includes a header and one or more data records. The header contains information on the whole recording (patient identification, start time...) and on each included signal (filtering, sampling rate...) coded as ASCII characters. The different data records contain samples as little-endian 16-bit integers.
Being an open and non-proprietary format it has been used as an exporting option of commercial devices as well as a vehicle for developing digital signal processing software independent of the acquisition system.
In 2003 an update of EDF (EDF+) allowing coding discontinuous data as well as annotations in UTF-8 format was published .
Main application fields of EDF include Electroencephalography (EEG), electrocardiography (ECG) and sleep recordings. EDF and EDF+ can also be used in a wide range of physiological recordings such as nerve conduction studies, Evoked potentials, EMG and many others.
Other (open) formats
OpenXDF supplies a free OpenXDF/EDF viewer and support forums.
File Exchange Format for vital signs
The pre-final version of the document can be downloaded through the public web page of the project team http://www.cs.tut.fi/~varri/tc251/pt40/index.html. The final version has been submitted for the CEN Central Secretariat for publication and due to copyright issues it cannot be made publicly available here. http://www.cs.tut.fi/~varri/fef.html
Extensible Biosignal Format (EBS)
ASTM has published a data format for the storage of neurophysiological signals and measurements. The disadvantage of this format is that data is stored in ASCII which is inefficient for biosignals.
Massachusetts Institute of Technology (MIT) has published a database of ECG arrhytmias in digital form. The data format in which the signals have been stored is freely available.
Siemens-Elema, Sweden has made an open specification for storing biomesurements called SIFOR. The disadvantage of this specification is that the structure of binary data is not specified exactly and the sender and the receiver of the data have to be informed about it in advance before data exchange can happen.
Proprietary vendor formats
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "European_data_format". A list of authors is available in Wikipedia.|