CLT Vascular & Pigmented Lesion Treatment 2

Question 1

Which chromophore is the primary target when treating port wine stains with pulsed dye laser?

Accepted Answer

Oxyhemoglobin

Answer

Oxyhemoglobin in blood vessels absorbs the 585–595 nm wavelength of pulsed dye laser, making it the primary chromophore target for port wine stain treatment.

Question 2

A patient with Fitzpatrick skin type IV presents for treatment of solar lentigines. Which approach best minimizes dyspigmentation risk?

Accepted Answer

Use a Q-switched Nd:YAG at 1064 nm with conservative settings

Answer

The 1064 nm Nd:YAG has less affinity for epidermal melanin, reducing the risk of post-inflammatory hyperpigmentation in darker skin types.

Question 3

What is the term for the thermal relaxation time of a target chromophore?

Accepted Answer

The time required for the target to cool to half its peak temperature

Answer

Thermal relaxation time (TRT) is defined as the time required for the target tissue to dissipate 50% of its absorbed heat after laser exposure.

Question 4

During treatment of telangiectasias on the nose, the patient reports immediate darkening of the vessel followed by disappearance. This response indicates:

Accepted Answer

Successful photothermocoagulation of the vessel

Answer

Immediate vessel darkening (hemoglobin denaturation) followed by disappearance is the desired clinical endpoint for successful telangiectasia coagulation.

Question 5

Which wavelength is most selective for superficial dermal melanin pigmentation in seborrheic keratoses?

Accepted Answer

532 nm

Answer

The 532 nm wavelength (KTP or frequency-doubled Nd:YAG) is highly absorbed by melanin and targets superficial pigmented lesions effectively.

(CLT) Certified Laser Technician Practice Test

(CLT) Certified Laser Technician Practice Test

CLT Vascular & Pigmented Lesion Treatment 2