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.
Contrast Dye (used in some diagnostic tests such as MRIs) Some medical tests called imaging tests contain a type of dye called contrast dye.. Examples of imaging tests are MRIs and CT-scans. Contrast dyes can be harmful to people who have kidney disease. Not all imaging tests contain contrast dyes.