Abstract: A system for measuring haemodynamic parameters relating to a subject, the system comprising a DRS probe, a microscope probe, and a cap for use at a respective distal end of each of the probes, one at a time. The cap comprises a rigid flat contact surface for contact with a body surface of a subject, the contact surface comprising an aperture arranged such that, in use, the aperture is optically aligned with the optical probe. A rigid side wall surrounds the contact surface, defining a closed end and an open end, the closed end being formed by the contact surface. The open end is arranged to receive the probe in use. The side wall is arranged such that, in use, the cap is held in abutment against the probe. A securing portion is arranged to removably secure the cap to the probe.

Abstract: Acoustic imaging provides images with reduced reverberation noise and images of nonlinear scattering and propagation parameters of the object. The received signal from transmitted dual frequency band acoustic pulse complexes is processed with overlapping high and low frequency pulses. The high frequency pulse is used for image reconstruction and the low frequency pulse manipulate the nonlinear scattering and/or propagation properties of the high frequency pulse. The scattered signal from a single dual band pulse complex for filtering in the fast time (depth time) domain provides a signal with suppression of reverberation noise with 1st harmonic sensitivity and increased spatial resolution. Through filtering in the pulse number coordinate and corrections for nonlinear propagation delays, a linear back scattering signal with suppressed pulse reverberation noise, a nonlinear back scattering signal, and quantitative nonlinear forward propagation and scattering parameters are extracted.