Autofocusing optical-resolution photoacoustic endoscopy

作者：Xiong, Kedi; Yang, Sihua^*; Li, Xiaowan; Xing, Da

来源：Optics Letters, 2018, 43(8): 1846-1849.

DOI：10.1364/OL.43.001846

• IN-VIVO
• ULTRASONIC ENDOSCOPY
• ACOUSTIC LENS
• TOMOGRAPHY
• MICROSCOPY
• MIRROR
• ORGANS
• FRAMES
• PROBE
• 2ND

Photoacoustic (PA) endoscopy has the potential to diagnose early diseases in the gastrointestinal tract. For the first time, to our knowledge, we developed an autofocusing PA endoscope (AF-PAE) for the usually irregular gastrointestinal tract imaging to solve the deterioration of transverse resolution caused by the defocus scanning of the probe. The 9-mm-diameter AF-PAE probe integrated a 6-mm aspheric lens and 6-mm liquid lens to automatically adjust the optical focal length, and an unfocused ultrasonic transducer with a center frequency of 15 MHz is coaxially set for detecting PA signals. With this probe, the AF-PAE achieved a focus-shifting range from approximately 2 to 10 mm with high transverse resolution and image contrast in a 360 degrees field of view. Phantom experiment and vasculature distribution of a resected rabbit rectum have been performed to demonstrate the imaging ability of the AF-PAE for potential clinical applications in colorectal vessel imaging and subsequent diagnosis.

• 出版日期2018-4-15