Slit-enabled linear-array photoacoustic tomography with near isotropic spatial resolution in three dimensions

Area of Science:

• Biomedical Imaging
• Optical Imaging
• Medical Physics

Background:

• Photoacoustic tomography (PAT) is valuable for deep tissue optical absorption visualization in biomedical imaging.
• Linear arrays are common in PAT due to availability and ultrasound imaging compatibility, but have limited 3D imaging due to poor elevational resolution.
• Existing methods to improve 3D PAT lack efficiency, often requiring extended scanning times.

Purpose of the Study:

• To introduce a novel slit-enabled three-dimensional photoacoustic tomography system.
• To enhance elevational resolution and detection aperture in PAT without prolonging scan duration.

Main Methods:

• A metal slit was integrated at the linear array's focus in the photoacoustic tomography system.
• The slit diffracts photoacoustic waves along the elevation direction, improving detection.
• The system's performance was evaluated using phantom and animal studies.

Main Results:

• The slit-enabled system demonstrated a tenfold improvement in elevational resolution.
• The enhanced elevational resolution was achieved without any increase in the overall scanning time.
• The system successfully visualized optical absorption in deep tissues with improved 3D capabilities.

Conclusions:

• Slit-enabled three-dimensional photoacoustic tomography offers a significant advancement for biomedical imaging.
• This technique overcomes the limitations of linear arrays, providing high-resolution 3D imaging efficiently.
• The method holds promise for various applications requiring deep tissue imaging and optical property mapping.