PMID- 19940343
OWN - NLM
STAT- MEDLINE
DCOM- 20100209
LR  - 20131121
IS  - 1361-6579 (Electronic)
IS  - 0967-3334 (Linking)
VI  - 31
IP  - 1
DP  - 2010 Jan
TI  - A procedure for denoising dual-axis swallowing accelerometry signals.
PG  - N1-9
LID - 10.1088/0967-3334/31/1/N01 [doi]
AB  - Dual-axis swallowing accelerometry is an emerging tool for the assessment of 
      dysphagia (swallowing difficulties). These signals however can be very noisy as a 
      result of physiological and motion artifacts. In this note, we propose a novel 
      scheme for denoising those signals, i.e. a computationally efficient search for 
      the optimal denoising threshold within a reduced wavelet subspace. To determine a 
      viable subspace, the algorithm relies on the minimum value of the estimated upper 
      bound for the reconstruction error. A numerical analysis of the proposed scheme 
      using synthetic test signals demonstrated that the proposed scheme is 
      computationally more efficient than minimum noiseless description length 
      (MNDL)-based denoising. It also yields smaller reconstruction errors than MNDL, 
      SURE and Donoho denoising methods. When applied to dual-axis swallowing 
      accelerometry signals, the proposed scheme exhibits improved performance for dry, 
      wet and wet chin tuck swallows. These results are important for the further 
      development of medical devices based on dual-axis swallowing accelerometry 
      signals.
FAU - Sejdic, Ervin
AU  - Sejdic E
AD  - Bloorview Research Institute, Bloorview Kids Rehab and the Institute of 
      Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, 
      Canada. esejdic@ieee.org
FAU - Steele, Catriona M
AU  - Steele CM
FAU - Chau, Tom
AU  - Chau T
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20091126
PL  - England
TA  - Physiol Meas
JT  - Physiological measurement
JID - 9306921
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - Adolescent
MH  - Adult
MH  - Aged
MH  - *Algorithms
MH  - *Artifacts
MH  - Chin
MH  - Computer Simulation
MH  - Deglutition/*physiology
MH  - *Diagnostic Techniques, Digestive System
MH  - Humans
MH  - Middle Aged
MH  - Motion
MH  - *Signal Processing, Computer-Assisted
MH  - Water
MH  - Young Adult
EDAT- 2009/11/27 06:00
MHDA- 2010/02/10 06:00
CRDT- 2009/11/27 06:00
PHST- 2009/11/27 06:00 [entrez]
PHST- 2009/11/27 06:00 [pubmed]
PHST- 2010/02/10 06:00 [medline]
AID - S0967-3334(10)25878-1 [pii]
AID - 10.1088/0967-3334/31/1/N01 [doi]
PST - ppublish
SO  - Physiol Meas. 2010 Jan;31(1):N1-9. doi: 10.1088/0967-3334/31/1/N01. Epub 2009 Nov 
      26.