Abstract #3811

Geometric Fidelity of a Head-Specific 0.5T MR System: An Inter-Scanner Reproducibility Study

Curtis N Wiens¹, Chad T Harris¹, Jonathan Marduhaev², and Ian R.O. Connell^3,4,5

¹Research And Development, Synaptive Medical, Toronto, ON, Canada, ²System Engineering, Synaptive Medical, Toronto, ON, Canada, ³Department of Medical Biophysics,, University Health Network, Toronto, ON, Canada, ⁴Biomedical Engineering, University Health Network, Toronto, ON, Canada, ⁵Centre for Advanced Neurotechnological Innovation to Application, KITE Research Institute, University Health Network, Toronto, ON, Canada

Synopsis

Keywords: System Imperfections, System Imperfections: Measurement & Correction

Motivation: Reduced susceptibility induced distortions in the mid-field should improve the geometric fidelity of MR acquisitions.

Goal(s): The goal of this study was to characterize the geometric fidelity of head-specific 0.5T MR systems.

Approach: The geometric fidelity of the system was characterized over six different 0.5T MRI systems using a commercially available distortion phantom. At each site, 3D gradient recalled echo and field map acquisitions were acquired and distortion measurements were computed.

Results: The average 95^th percentile distortion over the six sites were 0.15±0.03mm and 0.33±0.03mm for 100mm and 180mm diameter spherical volumes respectively.

Impact: This study’s impact consists of characterizing the geometric fidelity of a head-specific, small-footprint MRI system and assessing its variance across multiple sites.

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