Influence on imaging qualitites of photoacoustic tomography caused by mismatch of ultrasonic velocities

Sihua Yang; Huaimin Gu

doi:10.1117/12.710945

27 October 2006 Influence on imaging qualitites of photoacoustic tomography caused by mismatch of ultrasonic velocities

Sihua Yang, Huaimin Gu

Proceedings Volume 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine; 60470J (2006) https://doi.org/10.1117/12.710945
Event: Fourth International Conference on Photonics and Imaging in Biology and Medicine, 2005, Tianjin, China

Abstract

In this paper, Influences of the acoustic path difference on photoacoustic (PA) images caused by mismatch of ultrasonic velocities were studied. We first proposed using the concentration-adjustable glycerite as an ultrasonic transmitting medium. By switching a appropriate concentration of the glycerite, it can make the velocities of the PA signals keep constant between transmitting medium and biological tissues, and avoid the acoustic path difference (APD) in image reconstruction. The experiments demonstrate that the acoustic path difference influences the imaging qualities badly: especially, the spatial resolution of PA image is extremely reduced. After matching ultrasonic velocity by glycerite the contrast of the reconstructed image is improved greatly and the background artifacts are reduced obviously. The spatial resolution of the reconstructed image is improved from 0.5mm to 0.15mm. It has great practical significance for applying photoacoustic tomography to noninvasive clinic diagnosis of cancer.

Citation Download Citation

Sihua Yang and Huaimin Gu "Influence on imaging qualitites of photoacoustic tomography caused by mismatch of ultrasonic velocities", Proc. SPIE 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine, 60470J (27 October 2006); https://doi.org/10.1117/12.710945

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