Fig. 4: Schematic of the CT-based transcranial ultrasound focusing setup and transient results.
From: Soft Metalens for Broadband Ultrasonic Focusing through Aberration Layers
A CT illustration of the human skull model, with the sonication path (dotted blue lines), the ultrasound signal is pulsed sine wave at 120 kHz and 0.5 MHz with five-cycle with trigger interval of 165 ms. B–D Three scanning sections of the human skull by computed tomography imaging includes coronal cross-section, axial cross-section, and sagittal cross-section, respectively. E–G Transient propagation plots for a five-cycle pulse source at frequency of 120 kHz and 0.5 MHz (H–J). The bold ‘I’,’R’, ‘T’ represent incident wave, reflected wave, and transmitted wave, respectively, where E, F, and G correspond to the propagation time at \(80\mu s\), \(100\mu s\), and \(120\mu s\), respectively. Pr and Dis represent the normalized sound pressure and normalized displacement, respectively.
