New materials have been found by a group of scientists to make magnetic resonance imaging (MRI) scanning clearer, safer and faster, the Australian National University (ANU) announced on Friday.

Magnetic resonance imaging is one of the most sensitive modern diagnostic tools and can be used for imaging cancers, spinal areas or brain function.

Because MRI uses magnetic fields instead of the ionizing radiation in X-rays and CT scans, it is much less damaging to the patient.

However, new high-field and ultra-high-field MRI scanners can heat the tissue of patients due to an increase of the radiofrequency energy absorption.

Scientists have found a way to increase the resolution of MRI scanners, while at the same time making the procedure quicker and safer for the patient,

An international group of researchers, including some from the ANU, have found that ultrathin metallic resonators, artificial materials with nanoscale periodic structures, suppressed the electric field, which is responsible for tissue heating.

They placed ultrathin metallic resonators under the patient inside an MRI machine, and increased the efficiency and quality of the scanning process.

"This research may evolve into a new and very practical device that enhances MRI imaging and scanning time," said Professor Yuri Kivshar, head of the Nonlinear Physics Centre in the ANU Research School of Physics and Engineering.

"It does not require any intervention into the hardware of the MRI scanner, but rather is an inexpensive add-on device that can be used with any existing MRI scanner," he said.

In their publication in Advanced Materials, the team reported that the resonators, also known as metamaterials, were able to spatially redistribute the electromagnetic near fields and double the signal-to-noise ratio.

The improvement will enable higher-resolution images to be obtained in the same time.

Alternatively scans with the same resolution as in current MRI scanners could be produced more quickly, reducing discomfort for patients, who need to lie motionless for long periods, and cutting hospital wait time.

The new technology is currently being patented and integrated into the production of commercial MRI scanners in collaboration with the medical company Mediwise.

However, a simpler approach may be special smart clothing for MRI scanning, said Alexey Slobozhanyuk, first author of the study and researcher at the International Laboratory of Applied Radiophysics at ITMO University.

"Stripes of metamaterial could be sewn into clothes, which would lead to higher resolution MRI images," he said.

The team included scientists from ITMO University in Russia, Australian National University, Ioffe Physical-Technical Institute of Russia, University Medical Center Utrecht in the Netherlands and Institute of Experimental Medicine RAMS in Russia. Endit

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