Light Emitting Diodes Based Photoacoustic and Ultrasound Tomography: Imaging Aspects and Applications

Tomographic photoacoustic and ultrasound imaging is essential for isotropic spatial resolution and to obtain a full view of the target tissue. However, tomographic systems with pulsed laser sources and custom made transducer arrays are expensive. Additionally, there are other factors that limit the wide use of photoacoustic and ultrasound tomographic systems which include the size of the tomographic systems that use pulsed laser and the laser safety issues. A cost-effective, compact and safe photoacoustic and ultrasound tomographic system can find several imaging applications both in clinics and small animal labs. LED-based photoacoustic imaging has shown the potential to bring down the cost, enable faster imaging with high pulse repetition rate and is safer when compared to pulsed lasers. The conventional US system can be adopted for photoacoustic imaging by adding a light source to it. Hence, linear transducer arrays are preferred as they are cheaper and allow faster imaging. The combination of LED-based illumination and linear transducer array-based tomographic imaging can be a cost-effective alternative to current tomographic imaging, especially in point-of-care applications.

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