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.
Updated June 24, 2015. Contrast dye is a solution that is used to accentuate specific structures when looking at a body image. Radiocontrast agents are substances that are used in studies such as x-rays, fluoroscopy, and computed tomography (CT) scans. MRIs use other agents that help to accentuate the magnetic properties of a part of the body.