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Answer + Analysis
1. What is the relationship between laser frequency and wavelength?
A. The higher the frequency, the longer the wavelength
B. The frequency is independent of the wavelength
C. The higher the frequency, the shorter the wavelength
D. The lower the frequency, the shorter the wavelength

Answer: C
Analysis: According to the basic physical principles of lasers, there is an inverse relationship between frequency and wavelength, as shown in the formula (c = f·λ), where (c) is the speed of light, (f) is the frequency, and (λ) is the wavelength. The higher the frequency, the shorter the wavelength. This principle is also applied to laser therapy, where different wavelengths correspond to different tissue penetration depths. For example, high-frequency lasers with shorter wavelengths have a stronger selective photothermal effect and can precisely act on target pigments or tattoo ink particles without harming surrounding tissues. This precise wavelength selection enables high-frequency lasers to effectively reduce side effects and recovery time in medical cosmetology, especially in treatments such as pigmentation removal and tattoo removal.

2. What are the advantages of high-frequency lasers in medical cosmetology?
A. The laser energy density is low
B. It can improve the penetration ability and is suitable for deep treatment
C. It causes great damage to the surrounding skin
D. It can only be used for surface treatment

Answer: B
Analysis: High-frequency laser, especially long-pulse laser, increases the depth and accuracy of treatment by adjusting the pulse duration. It can penetrate the surface layer of the skin, reach the dermis, and even deeper skin layers. This penetration makes it particularly suitable for treating deep problems such as pigmentation, tattoos, and skin remodeling. In addition, long-pulse laser reduces laser damage to the epidermis by releasing energy over a longer period of time, so that it can act more safely on deep tissues. Through selective photothermal action, high-frequency laser can accurately act on specific target tissues (such as pigment particles or collagen), greatly reducing damage to surrounding healthy tissues, and the treatment effect is more ideal.

3. What are the advantages of high-frequency laser when removing pigmentation with laser?
A. It can reduce damage to the skin and reduce the number of treatments
B. It has a longer wavelength and is suitable for deep treatment
C. It has a low energy density and is suitable for all skin types
D. It has poor accuracy and the effect is not obvious

Answer: A
Analysis: High-frequency laser has a shorter wavelength and therefore has a stronger selective photothermal effect. When treating pigmentation, it can accurately act on the target pigment particles, and the pigment particles are broken up by the photothermal effect of the laser and naturally eliminated by the body. Due to its short wavelength, high-frequency laser treatment can more accurately avoid damaging the surrounding normal tissues, which makes the treatment safer and more effective. In addition, since the laser can efficiently break up the pigment particles, it can usually achieve significant results in fewer treatments, reducing the patient's treatment burden and recovery time.

4. What is the role of high-frequency laser in laser tattoo removal treatment?
A. Can only break up the surface ink
B. Suitable for shallow tattoos
C. Can penetrate into the dermis of the skin and break up the tattoo ink particles
D. Only suitable for black tattoos

Answer: C
Analysis:High-frequency lasers, especially in long-pulse mode, can penetrate into the dermis of the skin, which is particularly important for removing deeper tattoos. Through selective photothermal action, high-frequency lasers can specifically act on tattoo ink particles, using their higher energy density and short wavelength to make the ink particles absorb laser energy in an instant and be quickly broken. In this way, the fragmented ink particles can be eliminated by the human immune system, gradually fading the tattoo. Compared with low-frequency lasers, high-frequency lasers reduce damage to other layers of the skin during treatment, improving the safety and efficiency of treatment. In addition, although high-frequency lasers have good effects on inks of various colors, they still show good treatment effects on deeper or multi-layered tattoos, especially colors that are more difficult to remove, such as blue and green.

5. How does laser frequency affect the safety and effectiveness of laser treatment?
A. The lower the frequency, the better the treatment effect
B. The higher the frequency, the more precise the treatment effect and the higher the safety
C. The frequency has nothing to do with the treatment effect and safety
D. The treatment effect of high-frequency laser is poor

Answer: B
Analysis: High-frequency laser has a stronger selective photothermal effect due to its shorter wavelength. During the treatment, it can act more accurately on the target tissue, such as pigment particles, tattoo ink or collagen in the skin. Due to this high-precision treatment, the energy of the laser can be concentrated on the area to be treated, reducing damage to the surrounding healthy tissue and improving the safety of the treatment. In addition, short-wavelength lasers can better penetrate the superficial layer of the skin, avoiding irrelevant interference with deep tissues, thereby reducing the occurrence of side effects. By adjusting the frequency and pulse characteristics of the laser, doctors can customize personalized treatment plans according to specific treatment goals, optimize treatment effects and shorten recovery time.

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