Revolving Permanent Magnet for Magnetomotive Ultrasound

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


In magnetomotive ultrasound (MMUS), solenoids have been extensively used to generate varying magnetic fields, that act to move nanoparticles and their surrounding tissue. Here we show, compare and contrast two magnetic devices, one based on a solenoid, another containing a rotating permanent magnet. Suitable field characteristics for this application include high flux density and gradient, and uniform field laterally in the image plane, and the corresponding design features are highlighted. Field measurements show that both magnets generate suitable fields. The magnetic force potentially exerted by the permanent magnet even exceeds that of the solenoid up to a depth of 4 mm. Considering the substantial heat generation in high inductance electromagnets, a permanent magnet would be preferable as it eliminates the need for cooling. Thus, we suggest the use of permanent magnets in MMUS devices to reduce the size, while maintaining a high field and gradient required to move nanoparticles.


External organisations
  • Lund University
  • Sigma Lundinova AB
  • Join Business & Technology AB
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Medical Image Processing


  • field, magnetomotive, permanent magnet, ultrasound
Original languageEnglish
Title of host publication2018 IEEE International Ultrasonics Symposium, IUS 2018
PublisherIEEE Computer Society
ISBN (Electronic)9781538634257
Publication statusPublished - 2018 Dec 17
Publication categoryResearch
Event2018 IEEE International Ultrasonics Symposium, IUS 2018 - Kobe, Japan
Duration: 2018 Oct 222018 Oct 25


Conference2018 IEEE International Ultrasonics Symposium, IUS 2018