A ray tracing approach to restoration and resolution enhancement in experimental ultrasound tomography.

Recursive ray tracing is applied for experimental time-of-flight projection data to achieve a resolution enhancement over the initial straight-ray reconstructed velocity image. Curved-ray reconstruction is performed using the dedicated simultaneous algebraic reconstruction technique (SART). Tomographic reconstructions from experimental data are compared to images obtained from simulated projection data for a refractive field mimicking the actual tissue-equivalent phantom. The simulation study adequately explains the macrostructural geometric distortion and loss of resolution in the straight-ray image due to refraction effects that are unaccounted for.