Using ultrasound waves, PiCUS Sonic Tomography assesses the internal structural condition of trees. This system provides an efficient, non-invasive method to evaluate decay patterns and structural integrity of living trees.

This system measures the speed in which wood transmits acoustic waves: sound travels slower through decayed wood or cavities than through solid wood. Internal decay is a major concern, especially with mature trees in proximity to properties and people. Structurally weakened trees are more susceptible to breaking and falling in adverse weather conditions. Test results are shown as a colour coded two-dimensional image, where decay and damaged wood are evidently represented, enabling the client to see the internal structure of trees.