Assessing fetal cardiac function by measuring myocardial radial velocity using the phased-tracking method

Katsusuke Ozawa, Jun Murotsuki, Susumu Miyashita, Jin Muromoto, Hideyuki Hasegawa, Hiroshi Kanai, Nobuo Yaegashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Objective: This study aimed to assess the cardiac function of healthy and pathological fetuses by measuring radial velocity using phased tracking (PT). Based on phase differences, PT allows the displacement of a specified point to be detected with improved spatial and temporal resolution. Methods: PT was used to assess cardiac radial velocity in the basal free wall of the left and right ventricles in 134 healthy fetuses, 10 second-trimester intrauterine growth-restricted (IUGR) fetuses, and 10 recipient twins with twin-to-twin transfusion syndrome (TTTS). Maximum velocities were measured in systole and early diastole. Results: Maximum radial velocity was successfully measured in 126 healthy fetuses (94%) at gestational ages of 16-40 weeks. Systolic and early diastolic maximum velocities increased with gestational age in both ventricles. As compared with controls, IUGR fetuses had significantly lower early diastolic maximum velocities in the right ventricle, and recipient twins with TTTS had significantly lower systolic and early diastolic maximum velocities in both ventricles. Conclusions: PT demonstrated right ventricular diastolic dysfunction in second-trimester IUGR fetuses as well as systolic and diastolic dysfunctions in both ventricles in recipient twins with TTTS. PT could be useful for evaluating fetal cardiac radial function.

Original languageEnglish
Pages (from-to)126-134
Number of pages9
JournalFetal Diagnosis and Therapy
Issue number2
Publication statusPublished - 2015 Aug 23


  • Fetal cardiac function
  • Intrauterine growth restriction
  • Myocardial radial velocity
  • Myocardial velocity
  • Phased-tracking method
  • Twin-to-twin transfusion syndrome


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