Enhancement of photoacoustic tomography in the tissue with speed-of-sound variance using ultrasound computed tomography

• 作者: 刘晓峻 程任翔 陶超
• 来源期刊: 中国物理B（英文版）
• 关键词: photoacoustic tomography speed of sound ultrasound computed tomography
• 年，卷（期）: 2015,（11）
• 页码范围: 114301-1-114301-7
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/11/114301

摘要

The speed-of-sound variance will decrease the imaging quality of photoacoustic tomography in acoustically inhomo-geneous tissue. In this study, ultrasound computed tomography is combined with photoacoustic tomography to enhance the photoacoustic tomography in this situation. The speed-of-sound information is recovered by ultrasound computed to-mography. Then, an improved delay-and-sum method is used to reconstruct the image from the photoacoustic signals. The simulation results validate that the proposed method can obtain a better photoacoustic tomography than the conventional method when the speed-of-sound variance is increased. In addition, the influences of the speed-of-sound variance and the fan-angle on the image quality are quantitatively explored to optimize the image scheme. The proposed method has a good performance even when the speed-of-sound variance reaches 14.2%. Furthermore, an optimized fan angle is revealed, which can keep the good image quality with a low cost of hardware. This study has a potential value in extending the biomedical application of photoacoustic tomography.