## Abstract

Medical ultrasound imaging is widely used to visualize
blood flow in the human circulatory system. However, conventional
methods are angle dependent. The Transverse Oscillation
(TO) method is able to measure the lateral velocity component,
and it has been demonstrated in in vivo measurements of
superficial blood vessels. To broaden the usability of the method,
it should be expanded to a phased array geometry enabling
vector velocity imaging of the heart. Therefore, the scan depth
has to be increased to 10-15 cm. This paper presents suitable
pulse echo fields (PEF). Two lines are beamformed in receive to
obtain lateral spatial in-phase and quadrature components. The
relative mean bias and standard deviation of the lateral velocity
component are computed as performance measures. For the PEF,
the coefficient of variance, CV, of the spectral frequencies, and
the energy ratio, ER, of leakage into negative frequencies are
used as metrics to assess estimator performance. At 10 cm’s
depth for an initial setup, the relative mean bias and standard
deviation are 9.1% and 9.5%, respectively. At a depth of 15 cm,
the values are 20% and 13%, respectively. The PEF metric ER
can be used to assess the bias (correlation coefficient, R: -0.76),
and therefore predict estimator performance. CV is correlated
with the standard deviation (R=0.74). The results demonstrate
the potential for using a phased array for vector velocity imaging
at larger depths, and potentially for imaging the heart.

Original language | English |
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Title of host publication | Proceedings of the 2010 IEEE International Ultrasonics Symposium |

Publisher | IEEE |

Publication date | 2010 |

Pages | 1323-1327 |

ISBN (Print) | 978-1-4577-0380-5 |

DOIs | |

Publication status | Published - 2010 |

Event | 2010 IEEE International Ultrasonics Symposium - San Diego, California, United States Duration: 11 Oct 2010 → 14 Oct 2010 http://ewh.ieee.org/conf/ius_2010/ |

### Conference

Conference | 2010 IEEE International Ultrasonics Symposium |
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Country/Territory | United States |

City | San Diego, California |

Period | 11/10/2010 → 14/10/2010 |

Internet address |