Alzheimer's disease & dementia

Eye scan sheds new light on Alzheimer's disease

New research by Australian scientists has demonstrated that a quick, non-invasive eye scan can identify changes in the retina that could be used to diagnose Alzheimer's disease.

Cardiology

Advanced MRI brain scan may help predict stroke-related dementia

An advanced Magnetic Resonance Imaging (MRI) brain scan analysis in patients with stroke-related, small vessel disease helped predict problems with thinking, memory and even dementia, according to new research published in ...

Surgery

Best treatment for herniated disc

Sudden back pain is often caused by a herniated disc. The intervertebral discs are a kind of buffer between the vertebrae and are heavily strained over the years. If they become brittle and break, parts of the tissue can ...

Medical research

Sound waves for your health

You may not be able to hear them, but they help to diagnose and treat patients every day. In the past 40 years, ultrasound imaging has gone from blurry black-and-white images, to sharp 3-D images in real time. And the technology ...

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Image

An image (from Latin imago) is an artifact, or has to do with a two-dimensional (a picture), that has a similar appearance to some subject—usually a physical object or a person.

Images may be two-dimensional, such as a photograph, screen display, and as well as a three-dimensional, such as a statue. They may be captured by optical devices—such as cameras, mirrors, lenses, telescopes, microscopes, etc. and natural objects and phenomena, such as the human eye or water surfaces.

The word image is also used in the broader sense of any two-dimensional figure such as a map, a graph, a pie chart, or an abstract painting. In this wider sense, images can also be rendered manually, such as by drawing, painting, carving, rendered automatically by printing or computer graphics technology, or developed by a combination of methods, especially in a pseudo-photograph.

A volatile image is one that exists only for a short period of time. This may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode ray tube. A fixed image, also called a hard copy, is one that has been recorded on a material object, such as paper or textile by photography or digital processes.

A mental image exists in an individual's mind: something one remembers or imagines. The subject of an image need not be real; it may be an abstract concept, such as a graph, function, or "imaginary" entity. For example, Sigmund Freud claimed to have dreamt purely in aural-images of dialogues. The development of synthetic acoustic technologies and the creation of sound art have led to a consideration of the possibilities of a sound-image made up of irreducible phonic substance beyond linguistic or musicological analysis.

This text uses material from Wikipedia, licensed under CC BY-SA