Fig. 4: Hematoma volume measurements on portable MRI.
From: Portable, bedside, low-field magnetic resonance imaging for evaluation of intracerebral hemorrhage
a1 Validation of manually segmented pMRI hematoma volumes against manual volumes on conventional (CT or 1.5/3T MRI) imaging (T2W (n = 37): r = 0.952, 95% CI: [0.907–0.975], p < 2.20e-16; FLAIR (n = 38): r = 0.899, 95% CI: [0.812–0.946], p = 1.90e-14). Bland-Altman plots for manual pMRI showed a bias of −1.70 cc [limits of agreement (LOA): −11.8–8.42] for (a2) T2W sequences (n = 37) and a bias of −1.22 cc [LOA: −20.8–18.4] for (a3) FLAIR (n = 38). b1 Validation of averaged ABC/2 estimated pMRI volumes against averaged estimated volumes on conventional (CT or 1.5/3T MRI) imaging (T2W (n = 40): r = 0.945, 95% CI: [0.892–0.972], p < 2.20e-16; FLAIR (n = 38): r = 0.835, 95% CI: [0.702–0.911], p = 7.53e-11). Bland–Altman plots for ABC/2 pMRI showed a bias of −3.74 cc [LOA: −20.2–12.7] for (b2) T2W (n = 40) and a bias of −7.89 [LOA: −38.0–22.2] for (b3) FLAIR (n = 38). c1 Manually segmented pMRI hematoma volumes against averaged estimated volumes using ABC/2 (T2W (n = 37): r = 0.977, 95% CI: [0.956–0.989], p < 2.20e-16; FLAIR (n = 38): r = 0.968, 95% CI: [0.936–0.984], p < 2.20e-16). Bland–Altman plots showed a bias of 1.962 [LOA: −5.76–9.68] for (c2) T2W (n = 37) and a bias of 1.79 [LOA: −4.46–8.04] for (c3) FLAIR (n = 38). Pearson correlations are reported for a1, b1, and c1 with confidence intervals. Line of identity shown in red (a1, b1). 95% confidence intervals are represented by bands (a1, b1, c1) and dashed gray lines (a2–3, b2–3, c2–3).
