Measurement accuracy of the flow velocity in pulsed ultrasound Doppler velocimeter

• Published in: Ultrasound in medicine & biology Vol. 25; no. 8; pp. 1265 - 1274
• Main Authors: Kagiyama, Mitsuyasu, Ogasawara, Yasuo, Tadaoka, Shinichiro, Kajiya, Fumihiko
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.10.1999; Elsevier
• Subjects: Biological and medical sciences; Blood flow; Blood Flow Velocity; Blood Vessels - diagnostic imaging; Cardiovascular system; Computational fluid dynamics; Computer simulation; Constriction, Pathologic; Doppler effect; Flow measurement; Fourier Analysis; Fourier transforms; Investigative techniques, diagnostic techniques (general aspects); Measurement accuracy; Medical sciences; Navier Stokes equations; Numerical Analysis, Computer-Assisted; Numerical simulation; Phantoms, Imaging; Poststenotic flow; Sample volume; Ultrasonic applications; Ultrasonic investigative techniques; Ultrasonography, Doppler, Pulsed; Ultrasound Doppler velocimeter; Velocimeters; Velocity measurement; Numerical simulation; Measurement accuracy; Poststenotic flow; Sample volume; Ultrasound Doppler velocimeter; Blood flow; Sonography; Doppler ultrasound study; Accuracy; Fourier transformation; Navier Stokes equation; Speed measurement; Stenosis; Circulatory system; Hemodynamics; Pulsed beam; Spectral analysis
• ISSN: 0301-5629; 1879-291X
• DOI: 10.1016/S0301-5629(99)00082-4

This paper presents a numerical simulation method for evaluating the measurement accuracy of the high-frequency pulsed ultrasound Doppler velocimeter (PUDV). The frequency distribution of the Doppler signal from a sample volume is calculated by dividing the sample volume into small cells and using the statistics of the velocities of the cells. The distribution is used to analyze the accuracy of the poststenotic velocity measurements of a 20-MHz 80-channel PUDV. The target flow field is obtained by solving Navier–Stokes equations numerically. It was shown that the velocities evaluated by the zero-cross and Fourier transform methods agreed well with the given velocities, and that flow separation was successfully detected. It was also shown that the tube diameter should be at least twice as large as the diameter of the sample volume to obtain accurate measurements.