منابع مشابه
Ultrasound-heated photoacoustic flowmetry.
We report the development of photoacoustic flowmetry assisted by high-intensity focused ultrasound (HIFU). This novel method employs HIFU to generate a heating impulse in the flow medium, followed by photoacoustic monitoring of the thermal decay process. Photoacoustic flowmetry in a continuous medium remains a challenge in the optical diffusive regime. Here, both the HIFU heating and photoacous...
متن کاملPhotoacoustic thermal diffusion flowmetry
Thermal Diffusion Flowmetry (TDF) (also called Heat Clearance Method or Thermal Clearance Method) is a longstanding technique for measuring blood flow or blood perfusion in living tissues. Typically, temperature transients and/or gradients are induced in a volume of interest and the temporal and/or spatial temperature variations which follow are measured and used for calculation of the flow. In...
متن کاملPulsed photoacoustic Doppler flowmetry using a cross-correlation method
The feasibility of making spatially resolved measurements of blood flow using pulsed photoacoustic Doppler techniques has been explored. Doppler time shifts were quantified via cross-correlation of pairs of photoacoustic waveforms generated within a blood-simulating phantom using pairs of laser light pulses. The photoacoustic waves were detected using a focussed or planar PZT ultrasound transdu...
متن کاملAmplitude-masked photoacoustic wavefront shaping and application in flowmetry.
Optical-resolution photoacoustic flowmetry (PAF) allows noninvasive single-cell flow measurements. However, its operational depth is limited by optical diffusion, which prevents focusing beyond shallow depths in scattering media, as well as reducing the measurement signal-to-noise ratio (SNR). To overcome this limitation, we used binary-amplitude wavefront shaping to enhance light focusing in t...
متن کاملPhotoacoustic Ultrasound (paus)
Introduction / Background: Photoacoustic Ultrasound (PAUS) is an ultrasound technique that relies on short duration laser pulses to produce the signal to be read by the transducer. These short duration laser pulses create an acoustic wave from the imaged object which can be read out by a transducer. This ultrasound method exploits the strong optical contrast of tissues, allowing it to image ana...
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ژورنال
عنوان ژورنال: Journal of Biomedical Optics
سال: 2013
ISSN: 1083-3668
DOI: 10.1117/1.jbo.18.11.117003