Removal of eye movement artefacts from single channel recordings of retinal evoked potentials using synchronous dynamical embedding and independent component analysis.
Med Biol Eng Comput
; 45(1): 69-77, 2007 Jan.
Article
in En
| MEDLINE
| ID: mdl-17139516
ABSTRACT
A system is described for the removal of eye movement and blink artefacts from single channel pattern reversal electroretinogram recordings of very poor signal-to-noise ratios. Artefacts are detected and removed by using a blind source separation technique based on the jadeR independent component analysis algorithm. The single channel data are arranged as a series of overlapping time-delayed vectors forming a dynamical embedding matrix. The structure of this matrix is constrained to the phase of the stimulation epoch the term synchronous dynamical embedding is coined. A novel method using a marker channel with a non-independent synchronous feature is employed to identify the single most relevant source estimation for reconstruction and signal recovery. This method is non-lossy, all underlying signal being recovered. In synthetic datasets of defined noise content and in standardised real data recordings, the performance of this technique is compared to conventional fixed-threshold hard-limit rejection. The most significant relative improvements are achieved when movement and blink artefacts are greatest no improvement is demonstrable for the random noise only situation.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Data Interpretation, Statistical
/
Electroretinography
/
Evoked Potentials, Visual
Type of study:
Clinical_trials
/
Diagnostic_studies
Language:
En
Journal:
Med Biol Eng Comput
Year:
2007
Type:
Article
Affiliation country:
United kingdom