Nonlinearity parameter for tissue-mimicking materials

摘要: A finite amplitude insert-substitution method has been used to determine the ultrasonic nonlinearity parameter B/A of nine versions water-based, macroscopically uniform ultrasonically tissue-mimicking (TM) nonfat and fat materials. In this method, second harmonic following transmission through degassed distilled water with known (B/A = 5.2) unknown sample are measured. The ratio these amplitudes allows calculation sample. Measured values materials range from 5.6 6.6. These compare favorably published for soft tissues. contrast, measured two 9.8 11.1; represent low high end most fresh fatty For comparison, was commonly available materials, corn oil ethylene glycol, results in good agreement values.