Article Figures & Data
Figures
- FIG 1.
Comparison of SOC and portable clinical MR imaging as well as examples of manual segmentation in 1 participant, a 4-day-old boy without intracranial abnormalities such as ischemia or hemorrhage. Segmentation at 1 level of the lateral ventricles is shown here; SOC (A), SOC with segmentation (B), portable (C), portable with segmentation (D). Hyperfine scans were acquired with software, Version 8.1.0.1. TRA indicates transaxial; AXI, axial; R, right; L, left; P, posterior; A, anterior.
- FIG 2.
Portable MR imaging versus SOC MR imaging–estimated ventricular volumes. The ventricular volumes using Hyperfine and SOC MR images are plotted. The ventricular volumes of each set of images for the 17 patients were estimated using ITK-SNAP.
- FIG 3.
Results of the Bland-Altman analysis. Plot of differences between method A (portable) and method B (SOC), expressed as percentages of the values on the axis [(portable – SOC) / mean%)], versus the mean of the 2 measurements. The bias (mean difference) of 2.06% is constant, with greater variation for lower ventricular volumes. s indicates standard deviation.
Tables
- Table 1:
General demographics of the study population, including indications for MR imaging that may influence ventricular volumes
Participants No. % Biologic sex (at birth) Female 7 42 Male 10 58 Ethnicity White 11 65 African American 1 6 Asian 2 12 Other 3 18 Indication Trauma 4 24 Altered mental status 3 18 Hemorrhage 2 12 Ischemic stroke 2 12 Infection 1 6 Hydrocephalus 0 0 Lesion/mass 0 0 Mean time to acquire images (min) SOC 23 (SD, 14) Low-field 32 (SD, 13) Age (days) 22 (SD, 7) - Table 2:
Scan parameters for SOC and Hyperfine scans used for ventricle volume quantification
Scan No. Scan Time (min:sec) In-Plane Resolution (mm) Section Thickness (mm) Section Spacing (mm) TR (ms) TE (ms) TI (ms) SOC T2-weighted TSE 16 0:56–5:09 0.4–0.8 2–3 20.4 3250–5980 92–104 NA SOC T2-weighted HASTE 1 0:53 0.7–0.9 4 4.4 1500 84 NA Hyperfine T2-weighted TSE 17 2:37–9:59 1.5–2 2–5 NA 2000 195–261 NA Note:—NA indicates not applicable.
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