Medical Imaging

In past few decades a procedural improvements of ultrasound systems lead to introduction of many different imaging modes. For instance B-mode, Plane Wave, Doppler, and Color Flow brought new capabilities to diagnostic imaging. However the biggest challenge in the field of ultrasound remain to be resolution imperfections when compared to other imaging modalities. This is because resolution in ultrasound imaging varies depending on depth, transducer central frequency, aperture size and many other variables.

This research is funded by Korean government and aimed to improve spatial and temporal resolution of ultrasonography by applying Compressive Sensing theory.

A conventional B-mode ultrasound is capable to display a cross-sectional image of the body. First a focused ultrasound pulse sequentially transmitted into the body where ultrasound waves interact with tissue. Part of initial wave’s energy is being reflected back to the transducer array by differences in acoustic impedance of tissue.

b_img b-mode-ultrasound-imaging

Figure 1. (left) 2D grey scale image of tissue mimicking phantom (right) Tx/Rx and beamforming phases of pulse-echo B-mode

plane-wave-ultrasound-imaging

Figure 3. Plane wave imaging

[reviewing]