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| Wave Inversion - parameters
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mech freq(hz): The frequency of mechanical vibration used to induce shear waves in the
object, in hertz (cycles per second). fov(x/y/z)(m): FOV in meter for x, y and z directions (z ignored for 2D processing) harmonic number: one of the first steps in m estimation is the ft of the data though time. If there are n time steps, n/2-1 harmonics are available for processing. Here 0 refers to the DC term and is not valid. Normally harmonic number 1 contains most of the energy and is chosen for wave inversion. phase range: enter the equivalent of a 2p . This value is used for phase unwrapping and calibration of measurements. phase offsets: The number of time samples in the phase data sequence. The phase samples are assumed to be evenly spaced over one full mechanical vibration cycle. menc(motion encoding): This is the conversion factor to convert a phase image (in radians) to displacement (in microns). MENC is a function of gradient amplitude, frequency and rise times. MENC is in units of mm / radian. For phase difference images using oscillating trapizodial motion sensitizing gradients, MENC can be calculated as:
where:
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