title: An experimental setup to characterize MR switched gradient-induced potentials.
abstract: We have developed an experimental setup as an in vitro research tool for studying the contamination of electrophysiological signals (EPS) by MRI environment; particularly, when due to the switched gradient-induced potentials. The system is composed of: 1) a MRI compatible module for the transmission of the EPS into the MRI tunnel, 2) a gelatin-based tissue-mimicking phantom, placed inside the tunnel, in which EPS is injected, 3) a detection module composed of a five input channel MRI compatible transmitter placed inside the tunnel, allowing an on-site pre-amplification of the bio-potentials and their transmission, via an optical fiber cable, to a four filtered output per channel receiver (350 Hz, 160 Hz, 80 Hz, and 40 Hz, for a total of 20 channels) placed in the control room, and 4) a signal processing algorithm used to analyze the generated induced potentials. A set of tests were performed to validate the electronic performances of the setup. We also present in this work an interesting application of the setup, i.e., the acquisition and analysis of the induced potentials with respect of the slice orientation for a given MRI sequence. Significant modifications of the time and frequency characteristics were observed with respect to axial, coronal or sagittal orientations.
authors.affiliation: Biomechanics and Bioengineering Lab, University of Technology of Compiègne, 60205 Compiègne, France. odette.fokapu@utc.fr
authors.forename: Odette
authors.initials: O
authors.lastname: Fokapu
authors.forename: Aziz
authors.initials: A
authors.lastname: El-Tatar
mesh_terms: D000465:Algorithms; D016477:Artifacts; D004562:Electrocardiography; D004581:Electronics; D004594:Electrophysiology; D005780:Gelatin / Q000737:chemistry; D006358:Hot Temperature; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods; D008991:Monitoring, Physiologic; D055100:Optical Fibers; D019047:Phantoms, Imaging; D012815:Signal Processing, Computer-Assisted
chemical_list: D005780:Gelatin