A strong, spatially uniform magnetic field aligns a small but significant fraction of the hydrogen nuclei of water molecules in the brain. A carefully controlled sequence of gradient fields and RF pulses is used to generate NMR signals that can be reconstructed to form a three-dimensional image in which contrast is dependent, in part, on the blood flow and/or oxygenation changes caused by neural activity. Thus, MRI can be used noninvasively to detect changes in local neural activity in the human brain.

All About Alzheimers

All About Alzheimers

The comprehensive new ebook All About Alzheimers puts everything into perspective. Youll gain insight and awareness into the disease. Learn how to maintain the patients emotional health. Discover tactics you can use to deal with constant life changes. Find out how counselors can help, and when they should intervene. Learn safety precautions that can protect you, your family and your loved one. All About Alzheimers will truly empower you.

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