The Refresh Orlando Heirs

Introduction

The goal of any imaging methodology used in dermatology is to diagnose melanoma in early stages, because on it depends effectiveness of treatment. Investigations shows, that early diagnosis is more than 90% curable and late is less than 50% [1]. The diagnosis and successful treatment is often supplemented with permanent monitoring of suspicious skin lesions.

Doctor’s diagnosis is reliable, but this procedure takes lots of time, efforts. These routines can be automated. It could save lots of doctor’s time and could help to diagnose more accurate. Besides using computerised means there are good opportunity to store information with diagnostic information in order to use it for further investigations or creation of new methods of diagnosis.

Skin lesion imaging methods

We found that there are number of various imaging methods of skin lesions [2]. The simplest visualisation method is photography. This method gives only top layer skin image. In order to get deeper layer image there is oil immersion used. It reduces reflections of surface and brightens the image of epidermis - the second skin layer.

The better results are reached when photos are made with polarized light source. Then there are diminished reflections of light form stratum corneum (top layer of skin). Then is easer to estimate the lesion structures like dots, globules, nets that are the major indicators to melanoma diagnosis.
The different illumination method called epiliuminescence can be used in order to get the image from deeper skin layers. The light is directed straight in to these layers and reflected goes back through lesion giving more information about consistence of light absorbers in these layers. This method of illumination improves diagnosis accuracy up to 10 percent [2].

Other interesting solution of getting more information from skin is using multi spectral photography [2]. There is used narrow frequency band of light illumination. Those images give information about consistence and concentration of absorbers and reflectors in the skin. The idea is that different pigment of skin absorbs different light wave, determining the colour of our skin. When those photos are made with range of light waves, we can calculate the reflectance frequency characteristics of skin. And comparing to normal skin characteristic there can be made diagnostic decisions about skin pigment consistency.

Other imaging method using laser is called CLSM (confocal scanning laser microscopy). It uses red or near infrared low power laser beam to scan skin surface. This beam can be focused in to different deep to get the image of it. The deep is limited to 300m, because of absorbance [2]. The distance between two layers (axial resolution) can be about 2 - 5 m. The main disadvantage of this method is complicated acquisition of image from reflected laser beam.

Ultrasound visualisation is usually used to measure depth of melanoma [1]. The other uses of ultrasound are limited by very little tissue differences between normal skin and lesion. If there is no melanoma practically there is no any differences. When doctor diagnoses melanoma, then he uses high frequency ultrasound (over 30 MHz) to measure penetration depth in order to make correct cut during surgery.

In optical coherence tomography is used short near infrared light pulses focused to papillary dermis [2]. Reflected light is combined with reference light that is reflected from mirror system in order to determine the depth of papillary dermis. Measurement of the interference pattern allows determination of the position within the tissue where the light was reflected. Using recent technologies with ultra sort light pulse, the maximum obtained resolution is 2 - 4 m. Visualisation depth is 1 - 1.5 mm.

The wide variety of methods shows, that there is no best universal visualisation. Some of them are used for different needs, other are very expensive. The choice of method depends on what features of skin lesions is wanted to visualise, and on availability of resources.
Algorithms of skin image processing

Digital dermatoscopic images itself does not provide formal and determined information. To get diagnostic information the digital image processing is used. Commonly used methods are based on geometrical feature extraction from image with lesion. The USA national health institute offers ABCD rule for classification of dermatological images in to benign, suspicious and melanoma [3]. ABCD are the letters of first feature words: A (asymmetry), B (border), C (bolour), D (dermatoscopic structures). According to these four values there are total dermatoscopic value calculated by formula:
TDV = A1,3 + B0,1 + C0,5 + D0,5 (1)

This score TDV contributes to the differentiation between benign and malignant lesions: 1,00 - 4,75 - benign skin lesion, 4,75 - 5,45 - suspicious, more than 5,45 - melanoma.

Mindaugas M. Article from skin imaging research
http://www.scienceprog.com

Bringing clarity to your world.

Today we live in a world of more information, more ways to
communicate, more things to do. There is more you can do and
even more you can discover.

Every day, millions of people around the globe rely on their
Windows PC to manage their increasingly digital lives. While
familiar tools for managing digital information are powerful,
today’s world requires more.

In today’s digital world, you want the PC to adapt to you, so
you can cut through the clutter and focus on what’s important to
you.

It enables a new level of confidence in your PC and in your
ability to get the most out of it.

It introduces clear ways to organize and use information the way
you want to use it.

It seamlessly connects you to information, people, and devices
that help you get the most out of life.

Windows Vista was originally expected to ship sometime early in
2006 as a minor step between Windows XP and Windows Blackcomb.
Gradually, Vista assimilated many important new features and
technologies of Blackcomb. On August 27, 2004, Microsoft
announced that it is delaying release of WinFS so that Vista
could be released in “a reasonable timeframe” (officially marked
as December of 2006). Two beta versions have been planned, the
first expected to debut on or before 3 Aug 2005 and the second
in Q4 2005, with release candidates to be released throughout
2006, five years after the release of Windows XP, making it the
longest time span between releases of its Windows operating
system.

Vista is currently available as a preview release available to
Microsoft Developer Network (MSDN) subscribers, and at select
Microsoft developer conferences. The preview release is
classified as an alpha version at the moment, and as such its
performance and feature sets are not representative of the
release product. Like many other products (including all Windows
releases since Windows 98), it has since been leaked onto
popular file sharing networks.

“Oh, wondrous power! How little understood…to fashion genius,
form the soul for good.” — Sarah J. Hale Your heart is a
beautifully designed pump whose purpose is to deliver blood,
together with life-giving oxygen and nutrients, to every cell,
tissue, and organ of your body. Shaped like a pear and weighing
about eleven ounces, the heart sits in the center of the chest,
pointing up toward the right shoulder. It is a specialized
muscle divided into four chambers, two on the right and two on
the left, which are separated by one-way valves. The heart
therefore is in a sense two pumps, because it’s right and left
sides are separated from each other.

There are four chambers in the heart, two–an atrium and a
ventricle–on either side. The right atrium is a receptacle for
the veins transporting blood back into the heart. When it has
filled, the chamber’s muscle contracts and empties its contents
through the tricuspid valve and into the right ventricle.

The right ventricle transports oxygen-depleted blood to the
lungs across the pulmonary valve and into the pulmonary artery
and its branches. The blood travels into progressively smaller
arteries and eventually into tiny vessels called capillaries.
These vessels have very thin and delicate linings that allow
oxygen and other nutrients to move into and out of the
bloodstream. The oxygen in the lungs moves across the capillary
membranes and into the blood, where it hooks up with the red
blood cells. The capillaries also eliminate carbon dioxide,
received from the tissues and cells of the body, to the lungs
where it is exhaled into the atmosphere.

Once these exchanges have been completed, the blood moves
through the pulmonary vessels to the left side of the heart. The
left atrium is the collecting chamber. Once it is full, the left
atrium moves its contents across the mitral valve into the left
ventricle.

The left ventricle is by far the most powerful pumping chamber
of the heart. Its contents must be propelled under pressure much
higher than in the other chambers, so the oxygen-enriched blood
can travel through the arteries of the body at a sufficient
pressure to reach every cell and organ. Its powerful thrust
sends blood through the aortic valve and into the aorta, the
largest artery in the body. From there the blood continues
flowing to the arteries.

This extraordinary round-trip takes about a minute and repeats
itself every minute of your life. In an average person’s
lifetime, it is estimated that the heart contracts 2.5 billion
times! Each day, the average heart beats some 100,000 times and
pumps more than 2,000 gallons of blood through the equivalent of
approximately 60,000 miles of blood vessels! Your heart is a
mighty organ indeed!