摘要
We present a novel noncontact ultrasound(US)and photoacoustic imaging(PAI)system,overcoming the limitations of traditional coupling media.Using a long coherent length laser,we employ a homodyne free-space Mach-Zehnder setup with zero-crossing triggering,achieving a noise equivalent pressure of 703 Pa at 5 MHz and a-6 dB bandwidth of 1 to8.54 MHz.We address the phase uncertainty inherent in the homodyne method.Scanning the noncontact US probe enables photoacoustic computed tomography(PACT).Phantom studies demonstrate imaging performance and system stability,underscoring the potential of our system for noncontact US sensing and PAI.
作者
龙星
胡毅成
王一冰
李长辉
Xing Long;Yicheng Hu;Yibing Wang;Changhui Li(Department of Biomedical Engineering,College of Future Technology,Peking University,Beijing 100871,China;National Biomedical Imaging Center,Peking University,Beijing 100871,China)
基金
supported by the National Key Research and Development Program of China(No.2017YFE0104200)
the Beijing Natural Science Foundation(No.JQ18023)
the National Natural Science Foundation of China(Nos.81421004 and 61971447)
the National Key Instrumentation Development Project of China(No.2013YQ030651)。
