<qa>  What is the LDS?The LDS may contain information of significant diagnostic and physiological value regarding the pulmonary parenchyma and vasculature, as well as the cardio- vascular system in general. In pilot clinical studies of patients with acute decompensated heart failure ADHF as well as patients with Pulmonary Hypertension, LDS signals patterns unique to these conditions were identified. We believe that these newly discovered ultrasound signals might provide a non-invasive radiation-free means to diagnose and monitor patients with Pulmonary Embolism. 