a) List, in order from the smallest to the largest amount of heat required, the
ID: 2077569 • Letter: A
Question
a) List, in order from the smallest to the largest amount of heat required, the different laser therapeutic methods used in health sciences. For each method, identify the temperature range involved (if known) and the lasers used. b) List the methods which do not involve heat. Identify the lasers used. The threshold power density for triggering photo-chemical reaction in HPD concentrated in a lesion is 15 mJ/cm^2 and the fluence required to accomplish a treatment for a malignant tumour using this method is roughly 100 J/cm^2. You are using a dye-laser at lambda = 630 nm to treat a tumour having a surface of 1 cm^2Explanation / Answer
cold laser therapy (also known as low-level laser therapy or class III laser) and high-power laser therapy (class IV therapeutic laser) experimental
Low level laser therapy (LLLT), also known as "cold" laser therapy, refers to a wide variety of procedures involving several laser types and treatment methods. LLLT uses red beam or near infrared nonthermal lasers with a wavelength between 600 and 1000 nanometers and from five to 500 milliwatts. In contrast, lasers used for surgery typically use 300 watts. When applied, the lasers penetrate the surface of the skin without a heating (burning) effect, produce no sensation and do not damage the skin. It is believed that due to the low skin absorption and no side effects, the laser light can penetrate deeply into tissues and can reach the site of damage or injury.
gallium Arsenide laser is usedi this type of LLLP
High Powered Lasers
High power laser therapy devices, also referred to as high does laser therapy (HDLT), (class IV therapeutic lasers) are purported to stimulate accelerated healing energy from superficial to deep levels (six to nine inches) over a larger surface treatment area. Its proposed use includes conditions such as arthritis, carpal tunnel syndrome, epicondylitis, sprains/strains, trigger points and various other musculoskeletal disorders. These devices are not to be confused with class IV surgical lasers.
High-power lasers (class IV therapeutic lasers; not to be confused with class IV surgical lasers) have power output of up to 7,500 mW; and supposedly offer more power, deeper penetration (can penetrate up to 10 cm2 instead of 0.5 to 2.0 cm2 for class III lasers) and a larger surface treatment area (cover up to 77 cm2 instead of 0.3 to 5.0 cm2 for class III lasers).
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