Parametric harmonic-to-fundamental ratio contrast echocardiography: A novel approach to identification and accurate measurement of left ventricular area under variable levels of ultrasound signal attenuation

Shiro Yoshifuku, Shigao D Chen, Eileen M. McMahon, Akiko Yoshikawa, Partho P. Sengupta, Josef Korinek, Marek Belohlavek

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Objectives: We introduced a harmonic-to-fundamental ratio (HFR) of the radiofrequency (RF) signals that reduces confounding effects of attenuation. We studied whether HFR analysis of RF signals received from contrast microbubbles allows accurate measurement of the left ventricular (LV) cavity area under varying levels of attenuation. Background: Attenuation is a fundamental problem in ultrasound imaging and limits the use of clinical echocardiography. Methods: RF data from short axis systolic and diastolic scans were obtained from 14 open-chest dogs following left-atrial bolus of Optison. Attenuation was induced by interposed silicone pads calibrated to induce 7 dB or 14 dB reductions of the backscattered RF signal. RF images were reconstructed from the RF signals, HFR values calculated for each image pixel for 0 dB, 7 dB and 14 dB attenuation conditions, and LV area obtained by summation of "LV cavity pixels". A reference LV cavity area was obtained from endocardial border tracings in enhanced scans by experts. Results: Correlation of the HFR-defined and reference areas at systole was R = 0.95, R = 0.94, and R = 0.91 for 0 dB, 7 dB and 14 dB levels of attenuation, respectively, and at diastole was R = 0.95 for 0 dB, 7 dB and 14 dB levels of attenuation. The mean difference from both systolic and diastolic values was <1.45 cm2 (i.e. negligible) in all attenuation settings. Conclusion: Our novel HFR method supports precise measurement of the LV cavity area in contrast images with simulated high attenuation of ultrasound signals.

Original languageEnglish (US)
Pages (from-to)109-118
Number of pages10
JournalUltrasonics
Volume46
Issue number2
DOIs
StatePublished - May 2007

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echocardiography
Echocardiography
Ultrasonics
attenuation
Pixels
harmonics
Silicones
Imaging techniques
cavities
diastole
pixels
systole
dogs
chest
image contrast
silicones
tracing
borders

Keywords

  • Contrast echocardiography
  • Fundamental signal
  • Harmonic signal
  • Left ventricle cavity area
  • Radiofrequency signal
  • Ultrasound attenuation

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Acoustics and Ultrasonics

Cite this

Parametric harmonic-to-fundamental ratio contrast echocardiography : A novel approach to identification and accurate measurement of left ventricular area under variable levels of ultrasound signal attenuation. / Yoshifuku, Shiro; Chen, Shigao D; McMahon, Eileen M.; Yoshikawa, Akiko; Sengupta, Partho P.; Korinek, Josef; Belohlavek, Marek.

In: Ultrasonics, Vol. 46, No. 2, 05.2007, p. 109-118.

Research output: Contribution to journalArticle

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abstract = "Objectives: We introduced a harmonic-to-fundamental ratio (HFR) of the radiofrequency (RF) signals that reduces confounding effects of attenuation. We studied whether HFR analysis of RF signals received from contrast microbubbles allows accurate measurement of the left ventricular (LV) cavity area under varying levels of attenuation. Background: Attenuation is a fundamental problem in ultrasound imaging and limits the use of clinical echocardiography. Methods: RF data from short axis systolic and diastolic scans were obtained from 14 open-chest dogs following left-atrial bolus of Optison. Attenuation was induced by interposed silicone pads calibrated to induce 7 dB or 14 dB reductions of the backscattered RF signal. RF images were reconstructed from the RF signals, HFR values calculated for each image pixel for 0 dB, 7 dB and 14 dB attenuation conditions, and LV area obtained by summation of {"}LV cavity pixels{"}. A reference LV cavity area was obtained from endocardial border tracings in enhanced scans by experts. Results: Correlation of the HFR-defined and reference areas at systole was R = 0.95, R = 0.94, and R = 0.91 for 0 dB, 7 dB and 14 dB levels of attenuation, respectively, and at diastole was R = 0.95 for 0 dB, 7 dB and 14 dB levels of attenuation. The mean difference from both systolic and diastolic values was <1.45 cm2 (i.e. negligible) in all attenuation settings. Conclusion: Our novel HFR method supports precise measurement of the LV cavity area in contrast images with simulated high attenuation of ultrasound signals.",
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author = "Shiro Yoshifuku and Chen, {Shigao D} and McMahon, {Eileen M.} and Akiko Yoshikawa and Sengupta, {Partho P.} and Josef Korinek and Marek Belohlavek",
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N2 - Objectives: We introduced a harmonic-to-fundamental ratio (HFR) of the radiofrequency (RF) signals that reduces confounding effects of attenuation. We studied whether HFR analysis of RF signals received from contrast microbubbles allows accurate measurement of the left ventricular (LV) cavity area under varying levels of attenuation. Background: Attenuation is a fundamental problem in ultrasound imaging and limits the use of clinical echocardiography. Methods: RF data from short axis systolic and diastolic scans were obtained from 14 open-chest dogs following left-atrial bolus of Optison. Attenuation was induced by interposed silicone pads calibrated to induce 7 dB or 14 dB reductions of the backscattered RF signal. RF images were reconstructed from the RF signals, HFR values calculated for each image pixel for 0 dB, 7 dB and 14 dB attenuation conditions, and LV area obtained by summation of "LV cavity pixels". A reference LV cavity area was obtained from endocardial border tracings in enhanced scans by experts. Results: Correlation of the HFR-defined and reference areas at systole was R = 0.95, R = 0.94, and R = 0.91 for 0 dB, 7 dB and 14 dB levels of attenuation, respectively, and at diastole was R = 0.95 for 0 dB, 7 dB and 14 dB levels of attenuation. The mean difference from both systolic and diastolic values was <1.45 cm2 (i.e. negligible) in all attenuation settings. Conclusion: Our novel HFR method supports precise measurement of the LV cavity area in contrast images with simulated high attenuation of ultrasound signals.

AB - Objectives: We introduced a harmonic-to-fundamental ratio (HFR) of the radiofrequency (RF) signals that reduces confounding effects of attenuation. We studied whether HFR analysis of RF signals received from contrast microbubbles allows accurate measurement of the left ventricular (LV) cavity area under varying levels of attenuation. Background: Attenuation is a fundamental problem in ultrasound imaging and limits the use of clinical echocardiography. Methods: RF data from short axis systolic and diastolic scans were obtained from 14 open-chest dogs following left-atrial bolus of Optison. Attenuation was induced by interposed silicone pads calibrated to induce 7 dB or 14 dB reductions of the backscattered RF signal. RF images were reconstructed from the RF signals, HFR values calculated for each image pixel for 0 dB, 7 dB and 14 dB attenuation conditions, and LV area obtained by summation of "LV cavity pixels". A reference LV cavity area was obtained from endocardial border tracings in enhanced scans by experts. Results: Correlation of the HFR-defined and reference areas at systole was R = 0.95, R = 0.94, and R = 0.91 for 0 dB, 7 dB and 14 dB levels of attenuation, respectively, and at diastole was R = 0.95 for 0 dB, 7 dB and 14 dB levels of attenuation. The mean difference from both systolic and diastolic values was <1.45 cm2 (i.e. negligible) in all attenuation settings. Conclusion: Our novel HFR method supports precise measurement of the LV cavity area in contrast images with simulated high attenuation of ultrasound signals.

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