Photoacoustic maximum amplitude projection microscopy by ultra-low data sampling

Area of Science:

• Biomedical Optics
• Photoacoustic Imaging
• Medical Instrumentation

Background:

• Photoacoustic microscopy (PAM) combines light and sound for biomedical imaging.
• High-frequency photoacoustic signals necessitate high-performance, costly acquisition systems.
• Capturing maximum amplitude projection (MAP) images in PAM is often complex and expensive.

Purpose of the Study:

• To develop a simple, low-cost MAP-PAM system.
• To overcome the limitations of conventional high-speed data acquisition in PAM.
• To provide an affordable alternative for photoacoustic sensing and imaging.

Main Methods:

• Implementation of a custom-made peak holding circuit for Hz data sampling.
• Utilizing the circuit to capture extremum photoacoustic signal values.
• System designed for a dynamic range of 0.01-2.5 V and a -6 dB bandwidth up to 45 MHz.

Main Results:

• The developed system successfully obtains photoacoustic maximum amplitude projection (MAP) images.
• Experimental results demonstrate imaging capabilities comparable to conventional PAM.
• The system exhibits a compact size and an ultra-low cost of approximately $18.

Conclusions:

• The proposed low-cost MAP-PAM system offers a viable and affordable alternative to conventional methods.
• This innovation provides a new performance standard for PAM devices.
• It opens avenues for developing optimal and accessible photoacoustic sensing and imaging tools.