Fig. 1. (Color online) Flexible large-area ultrasound arrays for medical applications made using embossed polymer structures^[17]. (a) Confocal microscope image of the P(VDF-TrFE) film directly after embossing. (b) Schematic cross-section of the flexible ultrasound transducers. (c) Photograph of the finished ultrasound transducer foil, illustrating its thinness of 0.1 mm and mechanical flexibility. (d) Transmit efficiency and (e) receive sensitivity as a function of frequency in water. (f) Photograph of the array integrated on a 6-mm EUS probe. (g) Pulse-echo signal of the array wrapped around the EUS probe measured in water. (h) Measured transmit and receive transfer functions versus frequency. (i) Area uniformity of the peak transmit transfer at 8.2 MHz at the transducer surface. The color scale indicates the peak transmit transfer in Pa/V. (j) B-mode image captured with plane wave compounding. The gray scale indicates the intensity in dB. (k) Photograph of a large area of flexible ultrasonic blood pressure sensor while still on the support glass. (l) Transmit transfer in Pa/V at the resonance frequency of 8.2 MHz of transmit elements, obtained using hydrophone measurements. (m) Recorded in vivo ultrasound data of the carotid of a healthy volunteer of the optimally positioned array element.