Abstract
There are several reasons why conventional ultrasonography is one of the most widely used modalities in medical imaging. It provides high resolution images in real-time, it does not use ionizing radiation, it is portable, among others. However, this modality is not efficient when molecular and cellular events are to be imaged. Photoacoustic imaging, on the other hand, is a modality that uses ultrasonic waves and has shown promising results for the generation of molecular and cellular images. The photoacoustic imaging is based on the photoacoustic effect, where light absorption is converted into acoustic waves due to the thermoelastic expansion. For this reason, its contrast is related to the optical absorption spectra of tissues composed by different molecular structures. The photoacoustic signal is also depend on the viscoelastic properties of the medium. This research project involves the development of a system for tissue characterization using ultrasound and photoacoustic images simultaneously. To achieve that, nanoseconds laser pulses will be used to induce photoacoustic events in the tissue, generating, therefore, ultrasonic waves acquired by a conventional ultrasound imaging system. In addition to that, a photoacoustic Doppler system using megahertz modulated continuous wave laser systems will be developed for flow characterization. Those methods will be characterized and evaluated using specialized tissue-mimicking phantoms presenting appropriate optical and ultrasonic properties. (AU)
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MATERIAL MIMETIZADOR DE TECIDOS BIOLÓGICOS (PHANTOM) E SEU USO BR 10 2015 026018 0 - Universidade de São Paulo (USP). . Theo Zeferino Pavan; Antonio Adilton Oliveira Carneiro; Luciana Camargo Cabrelli - January 2015, 01
SISTEMA TERANÓSTICO BR 10 2020 011842 0 - Universidade de São Paulo (USP). . Antonio Adilton Oliveira Carneiro; Theo Zeferino Pavan; Yaser Hadadian; João Henrique Uliana - January 2020, 01