Ion Beam Therapy (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption In many applications of ion-beam therapy, PET scans take too long to give a picture of whether the beam has accurately hit its target. Because gamma rays are emitted instantly when the beam interacts with tissue, gamma-ray imaging could indicate the precise location and dose while there's still time to adjust the treatment. Credit Lawrence Berkeley National Laboratory Usage Restrictions None 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.