In biology, an adaptation, also called an adaptive trait, is a trait with a current functional role in the life of an organism that is maintained and evolved by means of natural selection. Adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation.
Computed Tomography Angiogram (CT Angiogram). Guide. A computed tomography angiogram (CT angiogram) is a test that uses X-rays to provide detailed pictures of the heart and the blood vessels that go to the heart, lung, brain, kidneys, head, neck, legs, and arms.
An angiogram is a test used to examine blood vessels. When diagnosing a brain injury, the test involves injecting dye into an artery that supplies blood to the brain, usually through a catheter inserted in the groin. The dye highlights the blood vessels on x-ray, and can show any leakage from those vessels.