New imaging technique developed at Cedars-Sinai makes magnetic resonance imaging available to sicker patients. The findings of the study are published in Nature Biomedical Engineering.
The new technique, dubbed MR Multitasking, is detailed in today's issue of Nature Biomedical Engineering and solves the problem many cardiologists face when using conventional methods to perform MRI scans: how to get a still image when a beating heart and blood flow can blur the picture. "It is challenging to obtain good cardiac magnetic resonance images because the heart is beating incessantly, and the patient is breathing, so the motion makes the test vulnerable to errors," said Shlomo Melmed, MB, ChB, executive vice president of Academic Affairs and the dean of the Cedars-Sinai medical faculty. "By novel approaches to this longstanding problem, this research team has found a unique solution to improve cardiac care for patients around the world for years to come." Currently, the standard approach is to ask patients undergoing cardiac MRI to hold their breath while images are being taken--but then each image must be timed precisely to a specific part of a heartbeat. Unfortunately, this method has proved difficult, unreliable and unsuitable for patients, especially those who have irregular heartbeats or breathing problems. The investigators' solution: Rather than trying to avoid the motion caused by breathing and heartbeats, the investigators decided to embrace the movement, said Anthony G. Christodoulou, PhD, a research scientist in Cedars-Sinai's Biomedical Imaging Research Institute and the study's first author.
Incorporating motion and time into the MR Multitasking analysis means that the images have six dimensions, Christodoulou said. "If a picture is 2-D, then a video is 3-D because it adds the passage of time," Christodoulou said. "Our videos are 6-D because we can play them back four different ways: We can playback cardiac motion, respiratory motion and two different tissue processes that reveal cardiac health." MR Multitasking is already in use at several medical centers in the U.S. and China, Li said. The team now is looking to expand MR Multitasking to patients with other diseases, like cancer.
"People have to breathe no matter what disease they have, so the ability to separate out the motion is important to many medical specialties," Li said.