Figure 3
From: Towards clinical application of freehand optical ultrasound imaging
Acoustical characterisation of the freehand OpUS probe (a) Composite field scan comprising the coherent summation of field scans for each OpUS source in the array after back-propagation to the transducer surface, pressure presented in MPa. (b) Mean and 95 % confidence interval of the 61 time traces measured on-axis at full laser power, measured at 1.5 mm from the generator surface. (c) Mean and 95 % confidence interval of the acoustic power spectra for all 61 OpUS sources in the freehand probe.
