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Preliminary study of human lung elasticity with the noninvasive surface wave technique

Mechanical properties of lung are closely related to lung diseases. However, currently there are no noninvasive methods that can measure the local lung tissue mechanical properties. In this paper, a technique that involves tracking the surface wave propagation and using ultrasound images to guide the measurements is introduced. The proposed method is tested on a human subject at both functional residual capacity (FRC) and total lung volume (TLV) conditions. The results show that the surface wave speed at 200 Hz is 4.31 m/s and 7.43 m/s at FRC and TLV, respectively. The proposed method has a clinical potential for quantifying the lung regional stiffness noninvasively.