title: [Spectrum analysis of Doppler signals].
abstract: Doppler signal spectrum analysis contains useful haemodynamic information. Several parameters of the spectrum can be documented in numerics. Random interaction of the reflectors, the size of the ultrasound sample volume and the procedure of signal analysis influence the results and hence may cause misinterpretation of the data selected. Essential mechanisms influencing the clinician's Doppler-spectrum-analysis are discussed on the basis of a series of 59 angiographically and sonographically examined carotid arteries as well as in the light of theoretical considerations and a review of the literature. Peak frequency linked with a battery of spectrum parameters accuracy are useful to differentiate various degrees of lumen narrowing. Identification or exclusion of minor plaques cannot be achieved with sufficient sensitivity and specificity.
authors.affiliation: Neurologische Klinik der Universität Heidelberg, Klinikum Mannheim.
authors.forename: M
authors.initials: M
authors.lastname: Daffertshofer
authors.forename: M
authors.initials: M
authors.lastname: Hennerici
mesh_terms: D002339:Carotid Arteries / Q000000981:diagnostic imaging*; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging; D005583:Fourier Analysis; D006801:Humans; D011859:Radiography; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis / Q000379:methods; D014463:Ultrasonography
vernacular_title: Spektrumanalyse von Dopplersignalen.