Fig. 1. The schema of calculating skull thickness and the area of cerebrospinal fluid layer. The skull thickness, d1 and d2, was measured at the position of emitter or detector perpendicularly. The area of cerebrospinal fluid was traced and measured by NIH ImageJ for Windows (National Institutes of Health, Bethesda, MD). 

Fig. 1. The schema of calculating skull thickness and the area of cerebrospinal fluid layer. The skull thickness, d1 and d2, was measured at the position of emitter or detector perpendicularly. The area of cerebrospinal fluid was traced and measured by NIH ImageJ for Windows (National Institutes of Health, Bethesda, MD). 

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