Ultrasonically Encoded Photoacoustic Flowgraphy in Biological Tissue
نویسندگان
چکیده
منابع مشابه
Ultrasonically encoded photoacoustic flowgraphy in biological tissue.
Blood flow speed is an important functional parameter. Doppler ultrasound flowmetry lacks sufficient sensitivity to slow blood flow (several to tens of millimeters per second) in deep tissue. To address this challenge, we developed ultrasonically encoded photoacoustic flowgraphy combining ultrasonic thermal tagging with photoacoustic imaging. Focused ultrasound generates a confined heat source ...
متن کاملIn vivo optically encoded photoacoustic flowgraphy.
We present an optically encoded photoacoustic (PA) flow imaging method based on optical-resolution PA microscopy. An intensity-modulated continuous-wave laser photothermally encodes the flowing medium, and a pulsed laser generates PA waves to image the encoded heat pattern. Flow speeds can be calculated by cross correlation. The method was validated in phantoms at flow speeds ranging from 0.23 ...
متن کاملTime-reversed ultrasonically encoded optical focusing in biological tissue.
We report an experimental investigation of time-reversed ultrasonically encoded optical focusing in biological tissue. This technology combines the concepts of optical phase conjugation and ultrasound modulation of diffused coherent light. The ultrasonically encoded (or tagged) diffused light from a tissue sample is collected in reflection mode and interferes with a reference light in a photore...
متن کاملPhotoacoustic resonance spectroscopy for biological tissue characterization.
By "listening to photons," photoacoustics allows the probing of chromosomes in depth beyond the optical diffusion limit. Here we report the photoacoustic resonance effect induced by multiburst modulated laser illumination, which is theoretically modeled as a damped mass-string oscillator and a resistor-inductor-capacitor (RLC) circuit. Through sweeping the frequency of multiburst modulated lase...
متن کاملDeep-tissue photoacoustic tomography of genetically encoded iRFP probe**
Non-invasive studies of physiological and pathogenic processes in deep tissues require both new imaging techniques and advanced probes. One of the emerging approaches is photoacoustic (PA) tomography, which is a hybrid technique built on the PA effect[1]. PA imaging relies on the thermoelastic expansion of light absorbing objects, which subsequently produces ultrasonic waves that are then detec...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2013
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.111.204301