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Contract number
Time span of the project
General information
Name of the project:

Wave processes in medical systems

Goals and objectives
Goals of project:

The project is aimed at the design and development of efficient methods for the analysis and control of electromagnetic and acoustic fields by means of appropriate structuring of materials using complex periodic / quasiperiodic structures (for instance, metamaterials, metasurfaces or metalines) as well as single subwave resonators. The laboratory will be focusing on controlling the near field in the presence of biological tissues and effects related to this, such as an increase of the local density of electromagnetic and acoustic states, the resonance transfer of energy, the creation of high values of wave vectors and near-field focusing. Another important goal is applying the proposed «near field tuning» methods to approach the theoretical limit characteristics of such medical technologies as magnetic resonance imaging (MRI), high intensity focused ultrasound (HIFU), wireless power supply to implanted medical devices (such as implantable cardioverter defibrillators).

Project objective: 

  1. Developing theoretical and experimental tools that will allow to comprehensively understand the physical phenomena related to the interaction between close electromagnetic and acoustic fields with body tissues, including in-depth analysis of the fundamental limitations and the development of approaches to ensure future practical use.
  2. Filling the existing gaps between theoretically known ideal distributions   of radiofrequency (RF) fields and electric currents and the design of real wearable antennas for RF-excitation in ultra-high-field MRI.
  3. Considerably improving the quality of biomedical devices related to acoustic waves.
  4. Developing a system consisting of three main parts: a wearable device collecting the power of radiofrequency signals of the surrounding space and transforming it to ultrasonic waves; a wearable acoustic transmitter combined with a power accumulation system and a focusing metalens; an implanted device incorporating an acoustic receiver.
Research directions: Electrical engineering and electronics

The practical value of the study
Planned project results:

  1. Analytical and numerical procedures for computing the electromagnetic Green function with a focus on the interaction between the near field and the structured and complex media, as well as with biological tissues, with losses.
  2. Analytic and numerical procedures for computing the acoustic Green function with a focus on the interaction of the near field and structural and complex media as well as with biological tissues with losses.
  3. An experimental device for the measurement of the electromagnetic Green function.
  4. An experimental device for the measurement of the acoustic Green function.
  5. Approaches to the analysis and synthesis of electromagnetic and acoustic emitters in the presence of complex electromagnetic structures for the approximation of the desired distributions of fields.
  6. Distributions of electric current and field for the most homogeneous RF magnetic field in the domain of research in human tissues and for the minimization of the mutual contacts between adjacent antennas in wearable phased arrays.
  7. An approximation (solution of a reverse problem) of ideal structures as an inhomogeneous   periodic system of dipole sources using the Green function and a comparison of fields created ideal distributions of current and synthesized quasiperiodic systems of dipole sources.
  8. Numerical models of a new antenna based on a quasiperiodic system improving field homogeneity that is controlled by a single channel made of two antennas based on a   quasiperiodic system with weak mutual connection placed close to each other.
  9. Produced prototypes of two antennas (high field heterogeneity, low mutual connection) operating at a the Larmor frequency of protons in the 7 T field (300 MHz).
  10. Results of the experimental research (RF field measurement) of created by proposed antennas using the created methods in the presence of phantoms imitating the body, systems imitating the human body and the study of RF-fields with the use of an ultra-high-field MR system (a 7 T magnet) based on phantoms imitating the human body, including comparison with modern antennas.
  11. A multiphysical model of the generation of acoustic noise in MRI: interaction between a magnetic field and a gradient coil.
  12. Broadband absorbers made of metamaterials and metamaterials for elastic damping structures in MRI systems.
  13. Results of the development and optimization of the impedance coordinating the subwave length and a metamaterial for beam control.
  14. A concept of the design of a HIFU device for treatment and imaging with improved focusing capabilities.
  15. A metalens focusing ultrasonic waves in media with acoustic characteristics resembling those of water with a milllimeter-scale focal spot.
  16. A prototype of an AET system based on acoustic transformers with the maximum confirmed efficiency improved by focusing metalenses.
  17. A prototype of a system for energy accumulation from surrounding radio-frequency signals to supply power to AET systems.
  18. A prototype of a system for wireless charging of medical implants based on the developed prototypes of the accumulation system and the AET system.

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