Ultrasound imaging is a valuable medical technique, but some obstacles, such as bones and air bubbles, are impenetrable to ultrasound. These obstacles block the ultrasound beam and prevent imaging of deeper targets. This means that some structures within the body, such as areas behind the spine, cannot be imaged using regular ultrasound.
In my latest news story for Bioengineering Today, I describe a new technique for imaging tissue behind obstacles that are otherwise impenetrable to ultrasound. Read it here: Seeing Beyond Obstacles with Ultrasound.