Three-dimensional sensitivity mapping of a handheld magnetic probe for sentinel lymph node biopsy

Akihiro Kuwahata, Shinichi Chikaki, Asli Ergin, Miki Kaneko, Moriaki Kusakabe, Masaki Sekino

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

An experimental apparatus for three-dimensional sensitivity mapping of a handheld magnetic probe with a permanent magnet and a Hall sensor was developed. To optimize the shapes and sizes of the magnets, the sensitivity mappings of two types of magnets, column- and cone-type magnets, were evaluated by the experimental apparatus. The longitudinal sensitivities of column and cone types are 8 and 9 mm, respectively, for 5 μL of magnetic nanoparticles. The measured longitudinal sensitivities agree well with the sensitivities calculated by the finite element method. Furthermore, the maximum lateral resolutions of column and cone types are 4.1 and 3.7 mm, respectively. In terms of the directionality, the sensitivities of column and cone types of the angle of 90° with respect to the probe axis fall approximately to 72% and 50% at 6 mm distance from the probe head, indicating that the cone type has high directionality due to its sharp shape. The measurement of sensitivity mapping revealed that the characteristics of the cone-type magnet are superior to that of the column-type magnet for the identification of sentinel lymph nodes.

Original languageEnglish
Article number056720
JournalAIP Advances
Volume7
Issue number5
DOIs
Publication statusPublished - 2017 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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