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.
A magnetic resonance imaging or MRI is a test that generates images of the brain and adjacent tissue by use of radio waves and magnetic fields, states MedlinePlus. It's also known as an MRI of the head and is applicable in diagnosing brain conditions such as brain tumors and stroke.