Alignment of successive cardiac signals for analyzing changes in performance

Harry A. Silber; Peter V. Moulder; Andrew B. Martinez; Cedric F. Walker

Alignment of successive cardiac signals for analyzing changes in performance

Harry A. Silber, Peter V. Moulder, Andrew B. Martinez, Cedric F. Walker

Research output: Contribution to conference › Paper › peer-review

Abstract

A technique is described for aligning two recordings of a cardiovascular signal obtained at different times. Alignment allows comparison in analyzing changes in hemodynamic state. The technique is intended for use in patients during and immediately after cardiac surgery. A left-ventricular diameter signal is recorded in dogs. A fast Fourier transform is obtained using a window which results in accuracy of magnitude calculation within 0.1%. The fundamental frequency is also calculated. Using the magnitudes, the fundamental frequency, and the original digitized waveform, the phase angles are calculated using the periodogram method. This results in phase accuracy to within 0.35°. The phase of the first frequency component is set to 0, and the phase of each successive harmonic is adjusted accordingly.

Original language	English (US)
Pages	1771-1772
Number of pages	2
State	Published - Dec 1 1988
Externally published	Yes
Event	Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society - New Orleans, LA, USA Duration: Nov 4 1988 → Nov 7 1988

Other

Other	Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society
City	New Orleans, LA, USA
Period	11/4/88 → 11/7/88

ASJC Scopus subject areas

Engineering(all)

Cite this

Alignment of successive cardiac signals for analyzing changes in performance. / Silber, Harry A.; Moulder, Peter V.; Martinez, Andrew B. et al.
1988. 1771-1772 Paper presented at Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, New Orleans, LA, USA.

Research output: Contribution to conference › Paper › peer-review

@conference{cc37421daf364b2f8e4abc2a1de1e665,

title = "Alignment of successive cardiac signals for analyzing changes in performance",

abstract = "A technique is described for aligning two recordings of a cardiovascular signal obtained at different times. Alignment allows comparison in analyzing changes in hemodynamic state. The technique is intended for use in patients during and immediately after cardiac surgery. A left-ventricular diameter signal is recorded in dogs. A fast Fourier transform is obtained using a window which results in accuracy of magnitude calculation within 0.1%. The fundamental frequency is also calculated. Using the magnitudes, the fundamental frequency, and the original digitized waveform, the phase angles are calculated using the periodogram method. This results in phase accuracy to within 0.35°. The phase of the first frequency component is set to 0, and the phase of each successive harmonic is adjusted accordingly.",

author = "Silber, {Harry A.} and Moulder, {Peter V.} and Martinez, {Andrew B.} and Walker, {Cedric F.}",

year = "1988",

month = dec,

day = "1",

language = "English (US)",

pages = "1771--1772",

note = "Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society ; Conference date: 04-11-1988 Through 07-11-1988",

}

TY - CONF

T1 - Alignment of successive cardiac signals for analyzing changes in performance

AU - Silber, Harry A.

AU - Moulder, Peter V.

AU - Martinez, Andrew B.

AU - Walker, Cedric F.

PY - 1988/12/1

Y1 - 1988/12/1

N2 - A technique is described for aligning two recordings of a cardiovascular signal obtained at different times. Alignment allows comparison in analyzing changes in hemodynamic state. The technique is intended for use in patients during and immediately after cardiac surgery. A left-ventricular diameter signal is recorded in dogs. A fast Fourier transform is obtained using a window which results in accuracy of magnitude calculation within 0.1%. The fundamental frequency is also calculated. Using the magnitudes, the fundamental frequency, and the original digitized waveform, the phase angles are calculated using the periodogram method. This results in phase accuracy to within 0.35°. The phase of the first frequency component is set to 0, and the phase of each successive harmonic is adjusted accordingly.

AB - A technique is described for aligning two recordings of a cardiovascular signal obtained at different times. Alignment allows comparison in analyzing changes in hemodynamic state. The technique is intended for use in patients during and immediately after cardiac surgery. A left-ventricular diameter signal is recorded in dogs. A fast Fourier transform is obtained using a window which results in accuracy of magnitude calculation within 0.1%. The fundamental frequency is also calculated. Using the magnitudes, the fundamental frequency, and the original digitized waveform, the phase angles are calculated using the periodogram method. This results in phase accuracy to within 0.35°. The phase of the first frequency component is set to 0, and the phase of each successive harmonic is adjusted accordingly.

UR - http://www.scopus.com/inward/record.url?scp=0024172458&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024172458&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:0024172458

SP - 1771

EP - 1772

T2 - Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society

Y2 - 4 November 1988 through 7 November 1988

ER -

Alignment of successive cardiac signals for analyzing changes in performance

Abstract

Other

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this