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Answer + Analysis
1. What is the unit of laser intensity?
A) Watts per square centimeter (W/cm²)
B) Watts (W)
C) Joules (J)
D) Hertz (Hz)

Answer: A
Explanation: Laser intensity refers to the energy output of the laser per unit area, usually expressed in Watts per square centimeter (W/cm²). The use of this unit helps doctors accurately control the delivery of laser energy during treatment, thereby achieving effective effects on target tissues. For long-pulse laser therapy, understanding and applying laser intensity units is crucial because it affects the efficiency of selective photothermal effect. Selective photothermal effect refers to the ability of lasers to selectively act on specific pigments or tissues, avoiding damage to surrounding healthy tissues. By precisely controlling laser intensity, doctors can ensure that treatment is both effective and safe, minimizing side effects.

2. What problems may occur if laser intensity is too high?
A) Increase the treatment effect
B) Skin burns
C) Skin tightening
D) Accelerate pigment removal

Answer: B
Analysis: When the laser intensity is set too high, it may cause damage to the skin, the most common consequence is skin burns. If high-intensity laser energy is not precisely controlled, it may cause excessive heat concentration in the treatment area, exceeding the tolerance of the tissue, causing burns and inflammatory reactions. This will not only affect the treatment effect, but may also cause long-term problems such as pigmentation or scar formation. Therefore, when performing treatments such as long-pulse lasers, medical personnel need to carefully evaluate the laser intensity to ensure that the energy is sufficient to achieve the treatment goal without causing unnecessary damage to the skin. Reasonable intensity control can achieve effective selective photothermal effects and effectively remove pigments without harming surrounding healthy tissues.

3. In the treatment of laser tattoo removal, what results may be caused by insufficient intensity?
A) Excessive heating of the skin
B) Scar formation
C) Inability to effectively remove the ink
D) Skin burns

Answer: C
Analysis: In the process of laser tattoo removal, the setting of laser intensity is crucial. If the intensity is insufficient, the energy of the laser cannot effectively penetrate into the deep layers of the skin, resulting in insufficient decomposition of the tattoo ink. This means that the treatment may not achieve the desired effect, the pigment particles of the tattoo cannot be effectively broken up or excreted from the body, and the patient may need multiple treatments to achieve satisfactory results. The advantage of long-pulse lasers is that they can precisely target the ink in the tattoo through selective photothermal effects, reducing the impact on the surrounding skin. Therefore, ensuring the reasonable setting of laser intensity is the key to achieving effective treatment.

4. What are the main applications of long-pulse lasers?

A) Short-term pain relief
B) Tattoo and pigment removal
C) Skin moisturizing
D) Hair loss treatment

Answer: B
Analysis: Long-pulse lasers are widely used in tattoo and pigment removal due to their unique energy release characteristics. This laser technology can focus laser energy on specific pigment particles in the skin through selective photothermal effect, quickly heating and breaking up these particles so that they can be eliminated by the body's natural metabolic process. Compared with other types of lasers, long-pulse lasers have better penetration and selectivity when treating deep tattoo pigments, thereby reducing damage to the surrounding normal skin. In addition, proper laser intensity control makes the treatment process both efficient and relatively safe, reducing the risk of side effects. Therefore, the application of long-pulse lasers in the field of pigment removal is particularly prominent and has become the first choice for many cosmetic medical institutions.

5. What is the main goal of laser intensity control?
A) Increase the number of treatments
B) Ensure treatment effect and safety
C) Reduce treatment costs
D) Reduce the use of medical equipment

Answer: B
Analysis: Precise control of laser intensity is the core of achieving treatment effects and ensuring patient safety. Different treatment purposes require different laser intensities to ensure that the energy is sufficient to penetrate and act on the target tissue while avoiding damage to surrounding tissues. In long-pulse laser treatment, by properly adjusting the laser intensity, doctors can give full play to the advantages of selective photothermal effects and effectively disperse pigment particles without causing unnecessary skin burns or inflammatory reactions. Such control not only improves the treatment effect, but also greatly reduces the risk of side effects. Therefore, scientific adjustment of laser intensity is crucial to achieving ideal treatment results, ensuring that patients can maintain skin health and safety while achieving cosmetic effects.

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