Extended Data Fig. 2: Performance of the stretchable phased array at all incidence angles in the xz plane on the phantom replicated from the human neck.
From: Continuous monitoring of deep-tissue haemodynamics with stretchable ultrasonic phased arrays
a, A schematic setup of the characterization. Ultrasonic field mapping is carried out with the stretchable phased array on a flat (top left) or a curvilinear (top right) surface. The characterization system is composed of a water tank and a 3D motor system with a hydrophone at its tip. b, Mapped ultrasonic fields with the stretchable phased array on a flat (left) or a curvilinear (right) surface with an incidence angle range of 0° - 25°. Scale bars are 2 cm. c, Normalized beam intensity of the stretchable phased array at a typical carotid artery depth (~3 cm) with different incident angles. The inset illustrates the depth at which the intensity measurements are taken. d, Beam directivity of the stretchable phased array at a typical carotid artery depth (~3 cm) with different incident angles. The beam directivity of the stretchable phased array is comparable on the two surfaces at all incident angles in the range tested.
