A field focusing butterfly stripline detects NMR at higher signal-to-noise ratio

Yen-Tse Cheng; Jan G Korvink; Mazin Jouda

doi:10.1016/j.jmr.2023.107517

A field focusing butterfly stripline detects NMR at higher signal-to-noise ratio

J Magn Reson. 2023 Aug:353:107517. doi: 10.1016/j.jmr.2023.107517. Epub 2023 Jun 29.

Authors

Yen-Tse Cheng¹, Jan G Korvink², Mazin Jouda³

Affiliations

¹ Karlsruhe Institute of Technology (KIT), Institute of Microstructure Technology, Karlsruhe 76131, Germany.
² Karlsruhe Institute of Technology (KIT), Institute of Microstructure Technology, Karlsruhe 76131, Germany. Electronic address: jan.korvink@kit.edu.
³ Karlsruhe Institute of Technology (KIT), Institute of Microstructure Technology, Karlsruhe 76131, Germany. Electronic address: mazin.jouda@kit.edu.

PMID: 37418779
DOI: 10.1016/j.jmr.2023.107517

Abstract

We present a compact tuned magnetic resonance detector that merges the conductor topology of a butterfly coil with that of a stripline, thereby increasing the magnetic field intensity B₁ per unit current, which increases the detection signal-to-noise ratio for mass-limited samples by a factor of 2. The s-parameter measurements further reveal improved radiofrequency shielding through the suppression of B₁ outside the coil when operated within an array of similar detectors. Simulations additionally show a sharper B₁ fall-off for the butterfly stripline outside the sensitive sample region. Our design is compatible with 2D planar manufacturing procedures, such as printed circuit board technology, and surface micromachining.

Keywords: High SNR; Parallel MR; Radiofrequency shielding; Stripline detector.