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Answer + Analysis

1. Which of the following factors are mainly affected by the selection of laser spectrum?

A. Laser color and penetration depth
B. Laser power output
C. Laser reflectivity and scattering angle
D. Laser wavelength and frequency

Answer: A

Analysis:The choice of laser spectrum determines the color and penetration depth of the laser. Lasers of different wavelengths have different propagation characteristics in the skin. Long-wavelength lasers (such as 1064 nm) have stronger penetration ability and are suitable for treating deeper skin problems, such as skin aging or deep vascular lesions. Short-wavelength lasers (such as 532 nm) are more easily absorbed by the surface skin tissue, so they are suitable for treating shallow skin problems, such as spots or superficial vascular problems. The penetration depth and selective absorption characteristics of the laser determine that it can effectively act on the target tissue while reducing damage to the surrounding normal tissue, which also ensures the accuracy and safety of the treatment effect. By scientifically selecting the spectrum, the therapeutic effect of the laser can be maximized to ensure that it acts on the desired target level.

2. In the treatment of laser removal of pigmentation or tattoos, the commonly used laser wavelengths are:

A. 1064 nm and 532 nm
B. 1550 nm and 2940 nm
C. 1064 nm and 2940 nm
D. 532 nm and 1064 nm

Answer: A

Analysis:In the treatment of removing pigmentation or tattoos, the commonly used laser wavelengths are 1064 nm and 532 nm. Lasers with a wavelength of 1064 nm are suitable for deeper pigments, such as for treating melanin (such as dark spots and tattoos), while lasers with a wavelength of 532 nm are mainly used for treating shallower pigments. Pigment particles have different absorption abilities for different wavelengths of light. 1064 nm lasers penetrate deeper and can effectively act on deep skin pigments; while 532 nm lasers are mainly absorbed by surface pigments and are suitable for treating shallower spots. Through selective photothermal effects, these lasers can convert light energy into heat energy, accurately break up pigment particles, and excrete them from the body through natural metabolic processes, thereby achieving the purpose of removing spots and tattoos.

3. The application of 1064 nm long pulse laser in medical cosmetology is mainly used for:

A. Remove spots and tattoos
B. Improve skin elasticity and firmness
C. Treat vascular lesions
D. Promote skin surface repair

Answer: B

Analysis:1064 nm long pulse laser is widely used in medical cosmetology to improve skin elasticity and firmness, mainly by stimulating collagen regeneration in the dermis. Lasers with a wavelength of 1064 nm have strong penetrating power and can penetrate deep into the dermis of the skin, generating a thermal effect, promoting the production of collagen and elastic fibers, and thus improving the structure and elasticity of the skin. This photothermal effect is particularly prominent in long-pulse lasers, because their longer pulse width allows heat to be more evenly transferred to the deeper layers of the skin, avoiding excessive damage to the epidermis. Through this selective photothermal effect, 1064 nm long-pulse lasers can effectively stimulate the skin's repair and regeneration process, achieving skin tightening and anti-aging effects.

4. The main mechanism of action of 1064 nm long pulse laser in treating vascular lesions (such as erythritis) is:

A. Directly destroy blood vessels through strong thermal effect
B. Stimulate the repair of tissues around blood vessels
C. Reduce pigmentation on the surface of the skin
D. Improve vascular health by enhancing blood circulation

Answer: A

Analysis: When treating vascular lesions (such as erythritis), 1064 nm long pulse laser mainly acts on the diseased blood vessels through its strong thermal effect. Lasers of this wavelength can be selectively absorbed by hemoglobin in blood vessels, and the laser energy is converted into heat energy, which locally heats the blood vessels, causing the rupture and contraction of the blood vessel walls, thereby effectively treating vascular dilatation diseases. The long pulse characteristics of 1064 nm mean that the laser can evenly transfer heat to the deep layers of blood vessels over a longer period of time, reducing damage to surrounding tissues. In addition, the selective photothermal effect ensures the high efficiency of the treatment process, allowing the laser to accurately locate the lesion, minimize side effects and improve the treatment effect.

5. Which of the following factors mainly affects the safety and effectiveness of laser treatment?

A. The frequency of the laser
B. The choice of spectrum
C. The wavelength of the laser
D. The brightness of the light source

Answer: B

Analysis:The safety and effectiveness of laser treatment are directly affected by the choice of spectrum. Different wavelengths determine the penetration depth of the laser and its interaction with skin tissue. The correct spectrum selection can ensure that the laser acts precisely on the target tissue while avoiding damage to surrounding healthy tissue. Long-wavelength lasers (such as 1064 nm) can penetrate deeper into the skin and are suitable for deep tissue treatment, while short-wavelength lasers mainly act on surface skin problems, such as removing spots and treating superficial vascular lesions. By selecting the appropriate spectrum, the best effect and minimal side effects can be achieved during treatment, which is also the key to ensuring safe and efficient treatment.