光声成像作为一种兼具高光学对比度和大超声探测深度的新兴成像方法,突破了传统光学成像技术分辨率与成像深度相互制约的壁垒,获得了空前快速的发展,其中,光声显微成像技术继承了光声成像技术的优点,采用声学或光学聚焦的成像模式,可以...光声成像作为一种兼具高光学对比度和大超声探测深度的新兴成像方法,突破了传统光学成像技术分辨率与成像深度相互制约的壁垒,获得了空前快速的发展,其中,光声显微成像技术继承了光声成像技术的优点,采用声学或光学聚焦的成像模式,可以实现高对比度、高分辨率的生物组织结构、分子与功能成像,在神经学、眼科、血管生物学和皮肤学等研究领域具有潜在应用价值。为此,首先介绍了光声成像技术的原理和分类,然后围绕光声显微成像(Photoacoustic microscopy,PAM)技术这一主题,重点综述了新型PAM技术的发展情况、PAM焦深(Depth of focus,DoF)延拓技术以及PAM的生物医学应用。最后,总结了PAM技术发展存在的挑战,并对未来发展方向进行了展望。展开更多
A system for in vitro investigation of ultrasound contrast agent＇s enhancement effect is presented and evaluated. It includes the digital B-mode ultrasound scanner Belson3000A, the tissue-mimicking ultrasound phantom...A system for in vitro investigation of ultrasound contrast agent＇s enhancement effect is presented and evaluated. It includes the digital B-mode ultrasound scanner Belson3000A, the tissue-mimicking ultrasound phantoms and the software which is used for image quantitative analysis. The linear range, optimal settings and repeatability of the system are assessed and explored by scanning the ultrasound phantoms with different reflective intensities. The measurements are performed under an acoustic power from 4.8 to 12.3 mW, the scanner centre frequency is 3.5 MH and the gain setting is 50 dB. Both a self-made surfactant encapsulated microbubble and a commercial ultrasound contrast agent are scanned. The results show that the pixel intensity of ultrasonic images increases with the increase in the sound power, and for the stronger reflective phantoms of more particles, the increasing trend is much more evident. The system is optimal for evaluating the microbubble contrast agents＇ enhancement effects. It presents a simple, effective and real-time means for characterizing the enhancement ability of microbubbles.展开更多
文摘光声成像作为一种兼具高光学对比度和大超声探测深度的新兴成像方法,突破了传统光学成像技术分辨率与成像深度相互制约的壁垒,获得了空前快速的发展,其中,光声显微成像技术继承了光声成像技术的优点,采用声学或光学聚焦的成像模式,可以实现高对比度、高分辨率的生物组织结构、分子与功能成像,在神经学、眼科、血管生物学和皮肤学等研究领域具有潜在应用价值。为此,首先介绍了光声成像技术的原理和分类,然后围绕光声显微成像(Photoacoustic microscopy,PAM)技术这一主题,重点综述了新型PAM技术的发展情况、PAM焦深(Depth of focus,DoF)延拓技术以及PAM的生物医学应用。最后,总结了PAM技术发展存在的挑战,并对未来发展方向进行了展望。
基金The National Basic Research Program of China (973Program) (No.2006CB933206)the National Natural Science Foundation of China(No.50872021,60725101)
文摘A system for in vitro investigation of ultrasound contrast agent＇s enhancement effect is presented and evaluated. It includes the digital B-mode ultrasound scanner Belson3000A, the tissue-mimicking ultrasound phantoms and the software which is used for image quantitative analysis. The linear range, optimal settings and repeatability of the system are assessed and explored by scanning the ultrasound phantoms with different reflective intensities. The measurements are performed under an acoustic power from 4.8 to 12.3 mW, the scanner centre frequency is 3.5 MH and the gain setting is 50 dB. Both a self-made surfactant encapsulated microbubble and a commercial ultrasound contrast agent are scanned. The results show that the pixel intensity of ultrasonic images increases with the increase in the sound power, and for the stronger reflective phantoms of more particles, the increasing trend is much more evident. The system is optimal for evaluating the microbubble contrast agents＇ enhancement effects. It presents a simple, effective and real-time means for characterizing the enhancement ability of microbubbles.
