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a) Plot of right versus left C2/C3 normalized IJV flow. b) Plot of right versus left C5/C6 normalized IJV flow. c) IJV flow normalized to arterial flow for the C5/C6 neck level plotted against the C2/C3 neck level. Legend: triangles: HC; open circles: NST-MS; and plus signs: ST-MS. Threshold lines of Fijv/TA at C6 < 0.62 and Fijv/TA atC2 < 0.66 are drawn (dotted lines).
