Ultrasound is known for its use in imaging during pregnancy. But new advancements in the technology suggest that in the future, ultrasound could be used to disrupt the blood-brain barrier. This would allow doctors to more easily diagnose and directly treat illnesses like brain cancer without major surgery. WSJ’s Danny Lewis and Charlotte Gartenberg examine the new ways that ultrasound could be used more specifically and subtly to deliver accurate diagnoses and precise treatments. What do you think about the show? Let us know on Apple Podcasts or Spotify, or email us: FOEPodcast@wsj.com Sign up for the WSJ's free The Future of Everything newsletter . Further reading: New Ultrasound Therapy Could Help Treat Alzheimer’s, Cancer  Treatment Breakthrough for an Intractable Brain Cancer  The ‘Mini Brains’ solving medical mysteries and raising concerns We Can Now See the Brain Like Never Before  Learn more about your ad choices. Visit megaphone.fm/adchoices