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.
An MRI is an imaging test that uses powerful magnets and radio waves to produce detailed, computer-generated pictures of organs and tissue inside the body, including the brain and spinal column.ey Messages: 1  Magnetic resonance imaging (MRI) is a test that uses magnetic fields, not x-rays, to produce detailed images of the body, helping a doctor find, evaluate, or monitor a cancer. 2  During an MRI, a special dye may be used to help create a clearer picture.