blood clots (IMAGE) Penn State Caption Penn State researchers developed particles that target blood clots and visualize their structures well compared to traditional ultrasound imaging. These images show blood flowing from left to right: The top image does not have the particles, while the bottom one does. Credit Penn State/Scott Medina Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.