Evaluation Study of Fast Spectral Estimators Using In-vivo Data

Kristoffer Lindskov Hansen, Fredrik Gran, Mads Møller Pedersen, Iben Kraglund Holfort, Jørgen Arendt Jensen, Michael Bachmann Nielsen

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    Spectrograms in medical ultrasound are usually estimated with Welch's method (WM). To achieve sufficient spectral resolution and contrast, WM uses an observation window (OW) of up to 256 emissions per estimate. 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 dataset, 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 for each spectrogram. Furthermore, all 280 randomized spectrograms were 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
    Original languageEnglish
    Title of host publication2009 IEEE International Ultrasonics Symposium (IUS)
    Publication date2009
    ISBN (Print)978-1-4244-4389-5
    Publication statusPublished - 2009
    Event2009 IEEE International Ultrasonics Symposium - Ergife Palace Hotel, Rome, Italy
    Duration: 20 Sept 200923 Sept 2009


    Conference2009 IEEE International Ultrasonics Symposium
    LocationErgife Palace Hotel
    Internet address

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