Measure: To estimate the cranial capacity of each skull in the Gizmo, measure the area of the part of the cranium that houses the brain. This part of the cranium is roughly behind the red line in the diagram at right.
Chemical dyes are sometimes injected into patients prior to an MRI (magnetic resonance imaging) to enhance internal images. However, certain widely used MRI dyes may cause a number of side effects, including a serious, potentially fatal disease known as nephrogenic systemic fibrosis, or NSF.
The health care provider may inject a dye through one of your veins. This helps certain diseases and organs show up better on the images. Unlike computed tomography (CT) scans, MRI does not use radiation. Instead, it uses powerful magnets and radio waves.