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Laser in Medicine

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 1
أستاذ المادة نادية حسين صاحب طاهر       22/05/2017 04:46:51
Laser in Medicine:
Laser is “light amplification stimulated emission by radiation”.
A laser is a unique light source that emits a narrow beam of light of single wavelength in which each wave is in phase with others near it.
When an electron makes a transition from higher energy to lower energy state, a photon is emitted. The emission process can be one of two types, spontaneous emission or stimulated emission.
1.In spontaneous emission, the photon is emitted spontaneously, in a random direction, without external provocation.

2.In stimulated emission, an incoming photon stimulates the electron to change energy levels.
To produce stimulated emission, however, the incoming photon must have energy that exactly matches the difference between the energies of two levels, namely.
Laser energy that has been stored in the laser material. The output of pulsed laser is usually measured by the heat produced. Since in medicine lasers are used primarily to deliver energy to tissue, laser energy directed at human tissue causes a rapid rise in temperature and can destroy the tissue.
The amount of damage to living tissue depends on how long the tissue is at the increased temperature.
There are many different types of medical lasers. The two main groups are:
1.High Power (Heat) Lasers are used in many surgical procedures to cut, coagulate and evaporate tissues. These lasers are often called surgical lasers because they are used in surgery instead of a scalpel.
2.Low Level (Therapeutic) Lasers can be used for the stimulation of cell function. Their biological effect is not thermal, as is the case with surgical lasers.

Questions:
1. List three ways light can interact with tissue.
2. Give the wavelengths of visible, IR and UV light.
3. List three biological effects of UV light.
4. Why does the eye not see IR, UV light?
5. Which type of light responsible for tan the skin and why?
6. List the properties of laser.
7. Give the examples of applications for two types of laser in medicine. What are three ways light interacts with matter?


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .