Abstract WP201: The Performance of Portable Low-field Magnetic resonance imaging in Acute Ischemic Stroke

• DOI: 10.1161/str.56.suppl_1.wp201
• Publication Date: 2025-01-30T10:04:27Z
• Authors: Cody Ciaramitaro; Alexander Han; Shahid Nimjee; Cassandra Forrest; Annabel Sorby-Adams; W. Taylor Kimberly; Vivien Lee
• Keywords: Stroke; Acute stroke

Introduction: The use of ultra low-field portable Magnetic Resonance Imaging (pMRI) in acute ischemic stroke (AIS) is gaining interest, as pMRI FDA approved and has practical advantages over high-field MRI brain (hMRI). ACTION PMR study a prospective cohort enrolling AIS perform within 24 hours last known normal (LKN). We sought to report patients enrolled the from our institution evaluate performance compared hMRI. Methods: Among 10 center, 1 was excluded for technically nondiagnostic imaging due no infarct visible on hMRI, leaving 8 analysis. All had both hMRI during their hospitalization. Our institutional (Hyperfine Inc. Swoop®) 0.064 Tesla machine, protocol includes diffusion-weighted imaging, apparent diffusion coefficient, fluid-attenuated inversion recovery (scan time 18 minutes) sequences. Infarct size measured based upon maximum longitudinal axis DWI. Results: with radiographic infarcts mean age 61.0 years (range, 47.2 76.2) 2 were female. Thrombolysis administered 7 (87.5%) patients, NIHSS presentation 3.8 7). LKN 15.9 10.9 20.3) 7.3 (range 1.2 17.6). pMRI. On scans, lesions demonstrated. distribution follows: subcortical (6), cerebellar (1), cortical MCA/PCA (3). measured, 15.2 mm 3.6 37.6), 9 (90%) pMRI, smallest being 4.5 mm. In contrast, that not Case (Figure 1) demonstrated DWI-FLAIR mismatch right well. Conclusions: series, performed reasonably well able detect majority seen above also demonstrate mismatch. Clinicians need be aware strengths limitations maximize patient selection population. Future improvements DWI at low field may improve sensitivity small future.