Let's review. Exponential decay occurs when a population declines at a consistent rate. No matter how many are in the population at some point in time, the percent that leave the population in the next period of time will be consistent.
Definition of 'ventriculography'. Word Frequency. ventriculography (vÉnËtrÉªkjÊËlÉÉ¡rÉfÉª ) noun medicine. 1. radiography of the ventricles of the heart after injection of a contrast medium. 2. radiography of the ventricles of the brain after injection of air or a radiopaque material.
Myelography is an imaging examination that involves the introduction of a spinal needle into the spinal canal and the injection of contrast material in the space around the spinal cord and nerve roots (the subarachnoid space) using a real-time form of x-ray called fluoroscopy. Myelography is relatively safe and painless. 2  When a contrast material is injected into the subarachnoid space surrounding the nerve roots and spinal cord, it allows the radiologist to view outlines of the different areas of the spine that usually are not visible or distinguishable on x-rays.