Thursday, February 26, 2009

A trusty equivalent of steel

There is a saying that steel are the hardest ones next to the nanotechnology but, now we need to rewrite the history as the Lightweight metallic glass is much stronger than that of the steel. Yes, it is true. Already many companies foresee the use of this robust material in many applications from golf clubs to airplane gradient parts. This new kind of glass is made from stiff alloy and it has been honeycombed with soft crystals, that is both harder and tougher than steel. If we see the microscopic image, the atoms of this lightweight metallic glass are more closely packed than that of the steel and it has been proved by National Academy of Science. Usually a glass is made up of transparent silicon, but here mixture was deferred by opaque titanium and zirconium and is marvelous piece is lesser in weight than steel. The problem with most glass products like they have very bad fatigue resistance and now it has been completely eradicated in this alloy glass by Californian scientists. When we compare with normal glass the fatigue resistance is improved by a factor of 10 and hence it is stronger than steel. Here crystalline structures are uniform, allowing groups of atoms to slide past one another with relative ease, which stops cracks from forming and spreading.

Sunday, February 22, 2009

An Efficient Data Hiding scheme For Medical Images Using Frequency Domain

In these modern world all the information has been Digitized, so it is true that hospitals have been sharing their HIS (Hospital Information System) which contains Secure information’s like patient details, medical information’s. It is possible to hack the information over the particular port when the particular port is always used for information transmission by an experienced hacker. Therefore in order to provide Copyright protection we go for data hiding schemes, of which the effective one is Steganography i.e. the art of hiding information within images. For hiding patient information it is better to use Medical image itself. Digital watermarking is a technique of hiding specific identification data for copyright authentication. Most of the medical images are compressed by joint photographic experts group (JPEG) standard for storage. The watermarking is adapted here for interleaving patient information with medical images during JPEG compression, to reduce storage and transmission overheads. The digital watermarking technique that is used here is based on frequency domain technique where, the alternative pixels that are of same frequency are used for encryption. This technique to store texts and Graphical signals in medical images by sharing last bits of discrete cosine transform (DCT) coefficients from the middle frequency range onwards, in the frequency domain. The text data is encrypted before interleaving with images in the frequency domain to ensure greater security.

Wednesday, February 18, 2009

Imagers in medical technology

Imagers have become a vital part of today’s medical field and it has become an essential requirement of a good hospital. Recently, the world’s largest imager has been developed by Rutherford- Appleton laboratories which form the future of medical scanners. The main advantage of this technology is that with the help of this technology doctors can produce more sensitive and faster images on the body of a human at a very reasonable cost to the profession of healthcare. The technology also provides the functionality of analyzing instantly the medical screening tests and a valuable chance of detecting the deadly disease, cancer in its earlier stages itself. The imager is very easy to use and it is comparatively faster than the currently used scanners that scan the human body. The imager is developed with a very large, active pixel sensors which are specially designed for its usage in clinical applications like x ray imaging and mammography. The imager is about 15 times larger when compared to the area of the intel processors nowadays. The future of this imagers are said to be wafer scale imagers which would eliminate the need for costlier and inefficient lenses and enable cost effective, sensitive and faster medical imaging systems.

Friday, February 13, 2009

Cool your brain with technology

Brain coolers are a new technology that is surprising the medical field nowadays. These brain coolers perform a great and valuable function of saving the lives of many cardiac patients for whom the present treatment is ineffective. Brain cooling has been one of the most successful technologies that have increased the survival rates of the affected patients. Brain cooling not only increases the survival rate of the victims but also it makes the brain function better when compared to its previous conditions. The device designed employing this kind of brain cooling is called Benechill which can be used easily and conveniently without any medical training from the medical officials. The device uses perfluorochemicals, which are already used widely in eye surgeries and also for liquid ventilation of the lungs which are stored in the same canisters that are delivered to the nose as a fine mist through a nasal tube which is inserted into each nostril. Once these chemicals hit the back of the nose, they evaporate and release heat from the nose and the temperature drop that results is directly transferred to the brain since the brain lies adjacent to the nasal cavity. The device can bring two degree drop in one hour which is six times faster when compared to other methods.

Saturday, February 7, 2009

Speak over satellites with SatPhone

ISatPhone is the latest Inmarsat’s mobile satellite phone service which provides a simple and highly user friendly way of staying in touch. This phone can be used as a satellite phone or a Cell phone. The striking feature of this phone is the dual mode operating system which allows the phone to work in both satellite and GSM network which has made it as one of the popular mobile phones. It renders the possibility of optimizing the usage of the service and GSM networks which depends on the availability and conditions of the operating environment. The phone is indispensable when the location of the operating environment of the phone is changed frequently and where the network access of GSM is limited or no network access. Examples of such places include deserts, sea, countries with poor telecommunication setup or countries which have high mountains. It is used under most advanced communications satellites that support IP data services at broadband speeds and voice simultaneously. The medium which is used to transfer data is a two way satellite transfer system, which renders a very good access to the satellite network where there are limited or no network access which corresponds to additional data and voice services. 

Tuesday, February 3, 2009

Meauring using Radar interferometry

Radar is a unit of measuring the distance and orientation of a target with respect to a radar signal transmitter. Radar interferometry is a technique where two SAR images of the same area are combined by matching the pixels representing the same ground feature precisely and calculating the phase or distance between the two images to produce the so called inteferogram. The improvements in these radar interferometry are the production of an ultra high resolution DTM with state of art air borne radar systems and new generation radar satellite missions such as TerraSAR-X. Some innovative techniques for mapping small changes in the geometry of the surface of the earth down to the cm-level in real time and over a very large area with a pair of radar images. These techniques work with the usage of radar satellite constellations and also a new technology called ScanSAR. A radar satellite constellation is a group or three or more satellites carrying identical SAR sensors. With the help of these constellations the time necessary for the satellite to visit the same area again can be reduced to a single day or less. These techniques map subtle changes on the earth’s surface up to mm-level using a stack of radar images.