CLT Treatment Planning & Protocols 2 — Questions and Answers
Question 1: When calculating dosimetry for low-level laser therapy (LLLT), which parameter directly determines the energy density (fluence) delivered to tissue?
- Pulse repetition rate
- Power density multiplied by treatment time (Correct answer)
- Wavelength divided by spot size
- Frequency modulation setting
Correct answer: Power density multiplied by treatment time
Fluence (J/cm²) is calculated by multiplying power density (W/cm²) by treatment time (seconds).
Question 2: A patient presents with acute tendinitis. According to standard LLLT protocols, which energy dose range is most appropriate for an acute inflammatory condition?
- 1–4 J/cm² (Correct answer)
- 8–12 J/cm²
- 15–20 J/cm²
- 25–30 J/cm²
Correct answer: 1–4 J/cm²
Acute conditions typically respond to lower doses of 1–4 J/cm², while chronic conditions may require 4–12 J/cm².
Question 3: Which wavelength range is most effective for targeting deep musculoskeletal tissues (3–5 cm depth)?
- 200–400 nm (UV range)
- 400–600 nm (visible blue-green)
- 600–700 nm (visible red)
- 780–1000 nm (near-infrared) (Correct answer)
Correct answer: 780–1000 nm (near-infrared)
Near-infrared wavelengths (780–1000 nm) penetrate deepest into tissue, reaching musculoskeletal structures at 3–5 cm.
Question 4: When treating a large surface area wound with laser therapy, the therapist should apply which scanning technique to ensure uniform coverage?
- Fixed contact method at the wound center only
- Grid or scanning method moving across the treatment zone (Correct answer)
- Percussion technique along wound borders
- Single-point application at maximum power
Correct answer: Grid or scanning method moving across the treatment zone
A grid or scanning technique ensures that the entire wound surface receives a uniform dose of therapeutic energy.
Question 5: A patient taking photosensitizing medications (e.g., tetracycline) requires laser therapy. What is the most appropriate protocol adjustment?
- Proceed with standard parameters; medications are irrelevant
- Increase power to overcome drug interference
- Reduce dose, avoid UV-visible wavelengths, and monitor skin response (Correct answer)
- Apply laser only to areas not exposed to sunlight
Correct answer: Reduce dose, avoid UV-visible wavelengths, and monitor skin response
Photosensitizing drugs increase the risk of adverse skin reactions; dose reduction and wavelength selection away from UV-visible range are essential.
Question 6: Which tissue chromophore primarily absorbs near-infrared laser energy and initiates the mitochondrial photobiomodulation cascade?
- Hemoglobin
- Melanin
- Cytochrome c oxidase (Correct answer)
- Collagen
Correct answer: Cytochrome c oxidase
Cytochrome c oxidase in the mitochondrial respiratory chain is the primary photoacceptor for near-infrared photobiomodulation.
Question 7: For a treatment plan targeting peripheral neuropathy, what treatment frequency is most commonly recommended in clinical protocols?
- Once every 2–3 weeks
- Once per month
- 3–5 times per week for the initial phase (Correct answer)
- One single intensive session
Correct answer: 3–5 times per week for the initial phase
Peripheral neuropathy protocols typically call for 3–5 sessions per week during the initial treatment phase to optimize neuronal response.
CLT Treatment Planning & Protocols 2
When calculating dosimetry for low-level laser therapy (LLLT), which parameter directly determines the energy density (fluence) delivered to tissue?