Physicists construct distinctive antennas that enhance the standard and security of MRI
The exciting slotted microstrip line emits into a box-shaped human body phantom for MRI RF excitation of the body. The color diagram shows the normalized size of the simulated Hx distribution, while black contours represent wavefronts in the conductive medium. The calculated distribution of the surface current density on the slotted ground plane is shown with black arrows. Nature Communications (2021). DOI: 10.1038 / s41467-020-20708-w
Scanners used in research not only use one antenna that sends and receives the signal, but several antennae that can cause severe burns in internal tissue and organs. As a result, researchers are forced to run scanners on less voltage, which negatively affects the quality of their studies. Now, ITMO physicists, together with their colleagues from the M-Cube consortium, have developed the first leaky wave antennas for MRI scanners. The device can diagnose body organs without risk to patient health while improving the quality of the images captured in research scanners.
The special antennas are based on the principle of broadband radiation. The prototype was manufactured using standard printed circuit board technology, which reduced the cost and labor intensity of its production. MRT technology is based on the irradiation of patients with electromagnetic waves of a certain frequency. Inside the scanner, resonances occur in the human body that lead to the recorded image. The main problem is to get a high quality image without harming the patient’s body.
“Our idea is that we have many small antennas connected in series with a wave that propagates through them. Each element sends out part of the power so that together they form the total radiation. Thanks to the leaky wave method ( that are not) resonance) it is possible to reduce heating and make scanning safe for patients, “explains Dr. Georgiy Solomakha. Student at the ITMO Faculty of Physics and Engineering and lead author of the paper.
Similar antennas are used for direction finding and radar, and ITMO researchers have specially adapted them for use in MRI technology.
Georgiy Solomakha said the solution could open up new research applications for MRI technology. Since the new antenna technology significantly reduces heating, the electricity consumed by the scanner can be increased without risk. This, in turn, improves the quality of the resulting images, which means that it will be possible to study the functioning of internal organs in more detail or to follow the development of diseases.
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G. Solomakha et al. A self-adapted leaky wave antenna for ultra-high field magnetic resonance imaging with a low specific absorption rate, Nature Communications (2021). DOI: 10.1038 / s41467-020-20708-w Provided by ITMO University
Quote: Physicists Build Unique Antennas That Improve MRI Quality and Safety (2021, January 25), Retrieved January 25, 2021 from https://phys.org/news/2021-01-physicists-unique-antennas-mri -quality.html
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