Subarachnoid Space Measurements in Apparently Healthy Fetuses Using MR Imaging

American Journal of Neuroradiology

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FIG 1.
Axial T2-weighted fetal brain image demonstrating the measurements of the subarachnoid space: 1) Right frontal gyrus. 2) Left frontal gyrus. 3) Right insula gyrus. 4) Left insula gyrus.
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FIG 2.
Coronal T2-weighted fetal brain image demonstrating the measurements of the subarachnoid space: 1) Right frontal gyrus. 2) Left frontal gyrus. 3) Right insula gyrus. 4) Left insula gyrus. 5) Right inferior temporal gyrus. 6) Left inferior temporal gyrus.
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FIG 3.
A nomogram presenting the SAS size (millimeters) in the axial plane according to the 3rd, 15th, 50th, 85th, 97th percentiles and GA (weeks). A, Right frontal. B, Left frontal. C, Right insula; D, Left insula.
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FIG 4.
A nomogram presenting the SAS size (millimeters) in the coronal plane according to 3rd, 15th, 50th, 85th, 97th percentiles, and GA (weeks): A, Right frontal. B, Left frontal. C, Right insula, D, Left insula. E, Right inferior temporal. F, Left inferior temporal.

Intraobserver and interobserver agreement

Type of Agreement and SAS Location	ICC (95% CI)
Intraobsever
Ax. Rt. Fr.	0.761 (0.573–0.870)
Ax. Lt. Fr.	0.670 (0.431–0.816)
Ax. Rt. In.	0.865 (0.760–0.926)
Ax. Lt. In.	0.869 (0.762–0.929)
Cr. Rt. Fr.	0.942 (0.889–0.969)
Cr. Lt. Fr.	0.950 (0.908–0.973)
Cr. Rt. In.	0.911 (0.737–0.962)
Cr. Lt. In.	0.933 (0.767–0.973)
Cr. Rt. It.	0.890 (0.803–0.940)
Cr. Lt. It.	0.877 (0.780–0.933)
Interobserver
Ax. Rt. Fr.	0.742 (0.562–0.854)
Ax. Lt. Fr.	0.700 (0.499–0.830)
Ax. Rt. In.	0.858 (0.740–0.923)
Ax. Lt. In.	0.877 (0.718–0.941)
Cr. Rt. Fr.	0.913 (0.842–0.953)
Cr. Lt. Fr.	0.893 (0.807–0.942)
Cr. Rt. In.	0.884 (0.792–0.937)
Cr. Lt. In.	0.919 (0.852–0.956)
Cr. Rt. It.	0.893 (0.808–0.942)
Cr. Lt. It.	0.890 (0.798–0.941)