CLT Laser Treatment Parameters & Dosage 2

Question 1

Which parameter describes the total energy delivered per unit area during a laser treatment session?

Accepted Answer

Fluence (J/cm²)

Answer

Fluence, measured in J/cm², represents the total energy delivered per unit area and is the primary dosage metric in laser therapy.

Question 2

When treating a darker Fitzpatrick skin type (V-VI) with a laser, the therapist should generally:

Accepted Answer

Reduce fluence and use longer pulse durations

Answer

Darker skin types have more epidermal melanin, requiring lower fluence and longer pulses to reduce the risk of thermal damage and dyspigmentation.

Question 3

The concept of 'thermal relaxation time' (TRT) is most relevant when selecting:

Accepted Answer

Pulse duration

Answer

Pulse duration should be shorter than or equal to the TRT of the target to confine thermal damage to the target and spare surrounding tissue.

Question 4

A laser device has an output power of 2 W and the operator uses a spot size with an area of 1 cm². What is the irradiance?

Accepted Answer

2 W/cm²

Answer

Irradiance (power density) = Power ÷ Area = 2 W ÷ 1 cm² = 2 W/cm².

Question 5

In photobiomodulation (low-level laser therapy), the Arndt-Schulz law suggests that:

Accepted Answer

Optimal therapeutic doses lie within a specific dose window; too low or too high reduces efficacy

Answer

The Arndt-Schulz law applied to LLLT indicates a biphasic dose-response where a therapeutic window exists; doses below or above this window are less effective.

(CLT) Certified Laser Therapist Practice Test

(CLT) Certified Laser Therapist Practice Test

CLT Laser Treatment Parameters & Dosage 2