| Popis: |
Current intravascular ultrasound (IVUS) techniques of tissue characterization are morphology based, a characterization based on surface echogenicity and spectral parameters from the fundamental imaging alone. Complex harmonic signals develop as a result of heterogeneous composition of nonlinear tissue such as calcified lipids, not easily characterized in the fundamental mode. Tissue harmonic imaging (THI) offers substantial advantages such as nonlinear information, better lateral resolution, higher contrast resolution, low near field spatial variation and decreased sidelobes. The objective is to enhance tissue characterization with the extent of tissue nonlinearity for a better diagnosis. |
