Work

Structured-illumination photoacoustic Doppler flowmetry of axial flow in homogeneous scattering media

Year: 2013

Type: article

Abstract: We propose a method for photoacoustic flow measurement based on the Doppler effect from a flowing homogeneous medium. Excited by spatially modulated laser pulses, the flowing medium induces a Doppler frequency shift in the received photoacoustic signals. The frequency shift is proportional to the component of the flow speed projected onto the acoustic beam axis, and the sign of the shift reflects the flow direction. Unlike conventional flowmetry, this method does not rely on particle heterogeneity in the medium; thus, it can tolerate extremely high particle density. A red-ink phantom flowing in a tube immersed in water was used to validate the method in both the frequency and time domains. The phantom flow immersed in an intralipid solution was also measured.

Source: Applied Physics Letters

DOI: 10.1063/1.4819735

Authors: Ruiying Zhang, Junjie Yao, Konstantin I. Maslov, Lihong V. Wang

Institution: Washington University in St. Louis

Language: English

Topic: Photoacoustic and Ultrasonic Imaging

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funders: National Cancer Institute, National Institute of Biomedical Imaging and Bioengineering