CLT Laser Safety & Protocols 3 — Questions and Answers
Question 1: Which chromophore is the primary target when using a 1064 nm Nd:YAG laser for vascular lesion treatment?
- Eumelanin
- Pheomelanin
- Oxyhemoglobin (Correct answer)
- Water
Correct answer: Oxyhemoglobin
Oxyhemoglobin has an absorption peak near 1064 nm, making Nd:YAG effective for deeper vascular lesions.
Question 2: What is the correct response if a client experiences immediate urticarial reaction (hives) during a laser session?
- Continue treatment at lower fluence and monitor
- Apply a cold compress and continue after 5 minutes
- Stop treatment immediately, assess for anaphylaxis, and follow emergency protocol (Correct answer)
- Apply hydrocortisone cream and complete the session
Correct answer: Stop treatment immediately, assess for anaphylaxis, and follow emergency protocol
Urticaria can be an early sign of an allergic or anaphylactic reaction; treatment must stop immediately and emergency protocols must be followed.
Question 3: What term describes the technique of delivering laser energy in multiple rapid pulses to limit thermal diffusion to surrounding tissue?
- Fractional photothermolysis
- Selective photothermolysis (Correct answer)
- Quasi-continuous wave delivery
- Thermal relaxation stacking
Correct answer: Selective photothermolysis
Selective photothermolysis uses pulses shorter than the thermal relaxation time of the target to confine heat damage to the chromophore without harming surrounding tissue.
Question 4: Which personal protective equipment (PPE) is mandatory for both the operator AND the client during all laser procedures?
- Surgical masks and gloves
- Wavelength-specific optical density-rated eyewear (Correct answer)
- Lead aprons and thyroid shields
- UV-blocking face shields
Correct answer: Wavelength-specific optical density-rated eyewear
Wavelength-specific laser safety eyewear with adequate optical density is required for all individuals in the treatment room to prevent ocular injury.
Question 5: A laser technician notices the treatment room door was left open during a procedure. What is the immediate priority?
- Complete the pulse and then close the door
- Alert building security
- Stop firing, secure the room, and ensure no unauthorized personnel were exposed (Correct answer)
- Post a warning sign outside and continue treatment
Correct answer: Stop firing, secure the room, and ensure no unauthorized personnel were exposed
An open door during laser use exposes unauthorized personnel to beam hazards; firing must stop immediately and the area must be secured.
Question 6: What parameter directly determines the amount of energy delivered per unit area to the skin during laser treatment?
- Pulse duration
- Spot size
- Fluence (J/cm²) (Correct answer)
- Repetition rate (Hz)
Correct answer: Fluence (J/cm²)
Fluence, measured in joules per square centimeter, is the energy density delivered to the tissue and is the primary dosimetric parameter in laser therapy.
Question 7: When performing laser treatment near the orbital area, which additional precaution is required beyond standard eyewear?
- Use of lower fluence only
- Intraocular eye shields placed under the eyelids (Correct answer)
- Applying petroleum jelly to the eyelids
- Avoiding the periorbital region entirely
Correct answer: Intraocular eye shields placed under the eyelids
Intraocular metal eye shields placed beneath the eyelids provide direct protection to the cornea and lens when treating the periorbital area.
CLT Laser Safety & Protocols 3
Which chromophore is the primary target when using a 1064 nm Nd:YAG laser for vascular lesion treatment?