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KMID : 0357520170400010019
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Journal of Radiological Science and Technology
2017 Volume.40 No. 1 p.19 ~ p.25
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In Vitro Assessment of MRI Safety at 1.5T and 3.0T for Bone-Anchored Hearing Aid Implant
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Yeon Kyoo-Jin
Kim Hyun-Soo
Lee Seung-Geun
Lee Tae-Soo
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Abstract
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The aim of this study was to evaluate Magnetic Resonance Imaging safety by measuring the translational attraction, torque and susceptibility artifact for Bone-Anchored Hearing Aid (BAHA) implant at 1.5 T and 3.0 T MRI by standard criteria. In vitro assessment tools were made of acrylic-resin by American Society for Testing and Materials (ASTM) F2052-06 and F2119-07 standard. Translational attraction of BAHA implant was measured by the maximum deflection angle at 96 cm position, where the magnetically induced deflection was the greatest. The torque was assessed by the qualitative criteria of evaluating the alignment and rotation pattern, when the BAHA implant was positioned on a line with 45° intervals inside the circular container in the center of the bore. The susceptibility artifact images were obtained using the hanged test tool, which was filled with CuSO4 solution. And then the artifact size was measured using Susceptibility A rtifact Measurement (SA M) software. In results, the translational attraction was 0 mm at both 1.5 T and 3.0 T and the torque was 0(no torque) at 1.5 T, and +1(mild torque) at 3.0 T. The size of susceptibility artifacts was between 13.20 mm and 38.91 mm. Therefore, The BAHA implant was safe for the patient in clinical MR environment.
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KEYWORD
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Bone-Anchored Hearing Aid implant , safety , Susceptibility artifact , Translational attraction , Torque
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