Communication Dans Un Congrès Année : 2025

FQ-06. Magnetic position determination with giant-magnetoresistance and moving field-free point in catheter

Résumé

X-ray fluoroscopic imaging is the standard method to obtain catheter position during catheterization procedures, a minimally invasive surgery for diagnostic and treatment of the vascular network [1]. However, this method exposes both patients and doctors to ionizing radiation. To address this issue, we propose a new method to track the catheter by installing a magnetic sensor at the catheter tip and generating a known magnetic field (MF) around the operative zone. Due to the mandatory small size of the catheter, we utilized micrometer-sized giant magnetoresistance (GMR) sensors for this tracking system [2, 3]. GMR sensors require only two connection wires, have a wide bandwidth that allows flexibility in selecting the working frequency and can detect low-intensity MFs down to the nano Tesla range [4]. In this work, a 300µm x 700µm GMR chip (shown Fig.1a) is prepared and installed on a catheter to show the integration feasibility. The presented results are obtained with GMRs connected in a Wheatstone bridge configuration in a larger chip (shown Fig.1b) for ease of manipulation. Both present a similar magnetic response. Our novel tracking method is based on the time detection of a moving null MF, known as the Field-Free Point (FFP) inspired by Magnetic Particle Imaging (MPI) [5]. Rather than measuring the MF intensity to compute the position [6], the time detection of the FFP gives the information on the position. We constructed an experimental setup to demonstrate the feasibility of this method in one dimension [7]. On a 1D setup, along a line from -15cm to 15cm, we measure the positions and standard variations every cm. The results are shown in Fig 2. The average of all standard deviation is 1.3mm with an average deviation from the actual position of 4.9% showing promising results for further steps.
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Dates et versions

hal-04912303 , version 1 (26-01-2025)

Identifiants

  • HAL Id : hal-04912303 , version 1

Citer

Louis Paquet, Aurélie Solignac, Kevin Tse-Ve-Koon, Makoto Ohta, Noriko Tsuruoka, et al.. FQ-06. Magnetic position determination with giant-magnetoresistance and moving field-free point in catheter. INTERMAG2025 - The 16th Joint Conference on Magnetism and Magnetic Materials and Intermag, IEEE, Jan 2025, Nouvelle Orléans (Louisiane), United States. ⟨hal-04912303⟩
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