Blood Volume Imaging Technique

For some years now, bolus injections of chelated contrast agents, in particular gadolinium diethylenetriamine pentaacetic acid, have been used to assess regional cerebral blood volume, and, when the mean transit time of the contrast agent through the brain is known, cerebral blood flow. The high paramagnetic nature of these contrast agents alters the relaxation processes of water molecules in their surrounding. Changes are evident as a shortening in the relaxation times, and it is this shortening that is used to obtain a qualitative map of regional cerebral blood volume. The major disadvantages of this technique are the necessity of repeated bolus injections of a contrast agent, the potential for subject motion between injections to mask any regional cerebral blood flow (rCBF) changes, and the limited number of neurological states that can be studied in a single session.

Getting to Know Anxiety

Getting to Know Anxiety

Stop Letting Anxiety Rule Your Life And Take Back The Control You Desire Right Now! You don't have to keep letting your anxiety disorder run your life. You can take back your inner power and change your life for the better starting today! In order to have control of a thing, you first must understand it. And that is what this handy little guide will help you do. Understand this illness for what it is. And, what it isn't.

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