Figure 2.

Sodium signal in the superior sagittal sinus (SSS), a major vein, and demonstration of vein masking. A, Two axial slices and 1 sagittal slice of an example density‐weighted ²³Na dataset, demonstrating higher sodium signal in the SSS (blue arrowhead) than the surrounding tissue. B, ¹H FLASH image with veins appearing hypointense. Blue arrowheads mark the same point on the SSS as shown in (A). C, Demonstrating the binary vein mask (green) overlaid on the ¹H FLASH image from which the mask is calculated. Note that the SSS is not included in the mask as its diameter is larger than the 3 mm spatial filter. The images are from a healthy 30‐year‐old male volunteer