In-vivo validation of fast spectral velocity estimation techniques

Kristoffer Lindskov Hansen, Fredrik Gran, M M Pedersen, I K Holfort, J A Jensen, Michael Bachmann Nielsen

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    14 Citationer (Scopus)

    Abstract

    Spectrograms in medical ultrasound are usually estimated with Welch's method (WM). WM is dependent on an observation window (OW) of up to 256 emissions per estimate to achieve sufficient spectral resolution and contrast. Two adaptive filterbank methods have been suggested to reduce the OW: Blood spectral Power Capon (BPC) and the Blood Amplitude and Phase EStimation method (BAPES). Ten volunteers were scanned over the carotid artery. From each data set, 28 spectrograms were produced by combining four approaches (WM with a Hanning window (W.HAN), WM with a boxcar window (W.BOX), BPC and BAPES) and seven OWs (128, 64, 32, 16, 8, 4, 2). The full-width-at-half-maximum (FWHM) and the ratio between main and side-lobe levels were calculated at end-diastole for each spectrogram. Furthermore, all 280 spectrograms were randomized and presented to nine radiologists for visual evaluation: useful/not useful. BAPES and BPC compared to WM had better resolution (lower FWHM) for all OW0.05) at OW 128 and 64, while W.BOX scored less (p
    OriginalsprogEngelsk
    TidsskriftUltrasonics
    Vol/bind50
    Udgave nummer1
    Sider (fra-til)52-9
    Antal sider8
    ISSN0041-624X
    DOI
    StatusUdgivet - 1 jan. 2010

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