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载硫化铋叶酸靶向相变型超声光声双模态对比剂(3)
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摘要:光声成像利用宽束短脉冲激光辐照生物组织,组织内吸光子吸收光能后转化为热能,引起周围介质温度升高,产生热弹性膨胀,进而散发出声波信号,经传
光声成像利用宽束短脉冲激光辐照生物组织,组织内吸光子吸收光能后转化为热能,引起周围介质温度升高,产生热弹性膨胀,进而散发出声波信号,经传声器及图像处理系统接受并重建出光声图像,其光声信号强弱与光源及生物组织中的吸光成分密切相关[4,11]。本实验构建的FPBS-PFH-NPs在激光作用后检测到明显的光声信号,而P-PFH-NPs与双蒸水组均未见到明显变化。由于FPBS-PFH-NPs成功包裹Bi2S3后在近红外光作用下与单纯Bi2S3吸收光谱接近,具有较强的光吸收属性,能吸收近红外波段的激光能量,对靶区组织行光声成像,是良好的光声成像显像剂[12]。同时,激光辐照后,P-PFH-NPs和双蒸水组均未见明显变化,而FPBS-PFH-NPs组二维、造影模式超声成像明显增强,其原因可能是Bi2S3吸收激光能量转化为热能,使介质温度升高超过PFH沸点,发生液气相变为微气泡,增强靶区超声显影,成功证明了FPBS-PFHNPs具备光致相变及光声成像能力。
本实验成功制备了叶酸靶向相变型超声/光声双模态对比剂FPBS-PFH-NPs,具备良好的体外寻靶、相变及增强超声/光声显像能力,是一种极具发展潜能的靶向诊疗多功能分子探针。
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文章来源:《声学学报》 网址: http://www.sxxbzz.cn/qikandaodu/2021/0309/541.html
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