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Abstract #3804

Validity of Transfer Function (TF) Model for Partial in Partial out (PIPO) Device under Different MR Radio Frequencies

Ziyu Zuo1, Md Zahidul Islam1, Jianfeng Zheng1, Hongbae Jeong2, Ananda Kumar2, and Ji Chen1
1University of Houston, Houston, TX, United States, 2US Food and Drug Administration, Silver Spring, TX, United States

Synopsis

Keywords: Bioeffects & Magnetic Fields, Safety, Implantable Device

Motivation: To ensure the MR RF safety of partial in partial out (PIPO) implantable devices using transfer function (TF) characterization.

Goal(s): To determine the validity of the TF models for PIPO devices along various lead position at radio frequencies for 1.5T, 3T, 7T, and 10.5T MRI systems.

Approach: By doing experimental measurements and error estimation to validate TF characterization of PIPO devices in different lead trajectories at difference rerequencies.

Results: For 1.5T and 3T frequencies, the TF models are trajectory independent; for 7T and 10.5T frequencies, large variations in TF models were observed when the lead was positioned along different trajectories.

Impact: The reliability of TF method characterization of PIPO devices is confirmed for frequencies below 128 MHz (3T) and TF method becomes error-proned at very high field MRI frequencies.

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