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英文誌(2004-)

Journal of Medical Ultrasonics

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2001 - Vol.28

Vol.28 No.01

Original Article(原著)

(J015 - J023)

高フレームレートカラードプラ法のための選別された位相情報を用いるドプラ周波数推定法

Estimation of Doppler Shift Frequency Using Selected Phase Information for High Frame Rate Color Flow Mapping

田中 直彦1, 大槻 茂雄2

Naohiko TANAKA1, Shigeo OHTSUKI2

1芝浦工業大学システム工学部電子情報システム学科, 2東京工業大学精密工学研究所

1Department of Electronic Information Systems Shibaura Institute of Technology Faculty of Systems Engineering, 2Precision and Intelligence Laboratory, Tokyo Institute of Technology

キーワード : color flow mapping, Doppler shift, instantaneous frequency, interference, pulsed Doppler

We describe a new approach to processing signals used to estimate shift in Doppler shift frequency in high frame-rate color flow mapping (CFM) withfewer pulse transmissions. When an ultrasound pulse is transmitted to a large number of scatterers, the echoes from the scatterers overlap and interfere with one another. This interference causes the phase of the received echo signal to fluctuate, thus disturbing the estimated shift in Doppler frequency. The technique proposed here eliminates this disturbed phase information, leaving the remaining information for use in estimating the shift in Doppler frequency. The instantaneous frequency of the echo signal can serve as an index of the influence of interference. To test this technique in vivo, we used radio-frequency (RF) echo signals from the carotid artery for simulation and evaluated the error of the estimated Doppler shift frequency in several cases. Performance was enhanced when number of pulses transmitted was limited and this technique was used.