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

doi:10.1016/j.ultras.2009.07.007

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

Research output: Contribution to journal › Journal article › Research › peer-review

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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

Original language	English
Journal	Ultrasonics
Volume	50
Issue number	1
Pages (from-to)	52-9
Number of pages	8
ISSN	0041-624X
DOIs	https://doi.org/10.1016/j.ultras.2009.07.007 https://doi.org/10.1016/j.ultras.2009.07.007
Publication status	Published - 1 Jan 2010

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title = "In-vivo validation of fast spectral velocity estimation techniques",

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",

author = "Hansen, {Kristoffer Lindskov} and Fredrik Gran and Pedersen, {M M} and Holfort, {I K} and Jensen, {J A} and Nielsen, {Michael Bachmann}",

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T1 - In-vivo validation of fast spectral velocity estimation techniques

AU - Hansen, Kristoffer Lindskov

AU - Gran, Fredrik

AU - Pedersen, M M

AU - Holfort, I K

AU - Jensen, J A

AU - Nielsen, Michael Bachmann

PY - 2010/1/1

Y1 - 2010/1/1

N2 - 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

AB - 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

U2 - 10.1016/j.ultras.2009.07.007

DO - 10.1016/j.ultras.2009.07.007

M3 - Journal article

C2 - 19666182

VL - 50

SP - 52

EP - 59

JO - Ultrasonics

JF - Ultrasonics

SN - 0041-624X

IS - 1

ER -