Phased-tracking method

DOI Web Site 12 References
  • MIYASHITA Susumu
    Department of Obstetrics, Perinatal Medical Center, Dokkyo Medical University Department of Advanced Fetal and Developmental Medicine, Tohoku University Graduate School of Medicine
  • MUROTSUKI Jun
    Department of Advanced Fetal and Developmental Medicine, Tohoku University Graduate School of Medicine Department of Maternal and Fetal Medicine, Miyagi Children's Hospital
  • MUROMOTO Jin
    Department of Advanced Fetal and Developmental Medicine, Tohoku University Graduate School of Medicine Department of Maternal and Fetal Medicine, Miyagi Children's Hospital
  • OZAWA Katsusuke
    Department of Advanced Fetal and Developmental Medicine, Tohoku University Graduate School of Medicine Division of Fetal Medicine, National Center for Child Health and Development
  • HASEGAWA Hideyuki
    Graduate School of Science and Engineering for Research, University of Toyama
  • KANAI Hiroshi
    Department of Electronic Engineering, Tohoku University Graduate School of Engineering

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Other Title
  • 位相差トラッキング法

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Description

The ultrasonic ‘phased tracking method’ (PTM) is a newly developed technique in which we can observe the phase difference of adjoining received RF signals. We aim to apply PTM—which enables precise measurement of the target’s velocity with 0.1 mm/s accuracy without restriction of transmitting wave length—for noninvasive measurements of fetal arterial diameter change, pulse wave velocity (PWV), and estimated fetal pulse pressure. We analyzed normal and growth-restricted fetuses using PTM. The fetal descending aorta was identified in the long axis direction using conventional B-mode with a convex array probe. Raw radiofrequency signals were recorded from the vessel wall of the descending aorta. Offline analysis was attempted for wall motion velocity waves. We employed PTM for measurement of pulsatile fine movement of the fetal descending aorta. Changes in internal diameter and PWV were analyzed. Pulse pressure was estimated from the transformed formula of Moens-Korteweg. PWVs were revealed to be significantly higher in growth-restricted fetuses. We could also demonstrate elevated estimated fetal pulse pressure in growth restriction. Measurement of fetal aortic diameter changes and fetal PWV using PTM is a feasible, noninvasive approach to evaluate fetal hemodynamics. Elevated PWV and estimated pulse pressure in growth-restricted fetuses suggest altered arterial wall compliance by histological remodeling that has already originated in the fetal period. Fetal PWV and estimated pulse pressure possibly distinguish cases at high risk for hypertensive complications later in life, which substantiates Developmental Origins of Health and Disease (DOHaD) theory.

Journal

  • Choonpa Igaku

    Choonpa Igaku 43 (3), 483-490, 2016

    The Japan Society of Ultrasonics in Medicine

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