US Basics
US
Application
Light Therapy Basics
Light Therapy Application
Contraindications & Precautions
100

This effect describes how an electrical current electrical energy is converted into mechanical energy, which generates sound waves. 

What is the reverse piezoelectrical effect?

100

This ultrasound mode is typically prescribed for heating tissues.

What is continuous mode?

100

This term refers to the modification of biological processes using light.

What is photobiomodulation?

100

This technique divides the treatment area into square centimeters for targeted laser application.

What is the gridding technique?

100

This condition involving elevated body temperature is a contraindication for both ultrasound and laser therapy.

What is fever (body temperature >100.4°F)?

200

Ultrasound waves travel as this type of wave through tissue.

What is a longitudinal wave?

200

This coupling medium is required for ultrasound to effectively transmit energy.

What is gel (or water or gel pads)?

200

This type of laser emits less than 500 mW and does not heat body tissues.

What is a cold laser (Class 3B)?

200

This wavelength is associated with near-infrared LED therapy and penetrates 10–14 mm.

What is 875 nm?

200

Laser therapy should not be used near these implanted medical devices.

What are electrical implants (e.g., insulin pumps, pain pumps, cardiac pacemakers)?

300

This term refers to the decrease in ultrasound energy as it passes through tissues.

What is attenuation?

300

The optimal temperature range for therapeutic heating effects in tissue is between these two values.

What is 104°F to 113°F?

300

This law determines how deeply light penetrates tissue based on absorption.

What is the Beer-Lambert Law?

300

This type of LED is used for treating acne and MRSA and penetrates 3–4 mm.

What is blue LED (~460 nm)?

300

Although ultrasound can be used near these surgical implants, caution is required due to potential reflection and localized heating.

What metal screws or joint implants? 

400

The frequency of 3 MHz is best suited for treating injuries at this depth.

What is 2–3 cm (superficial tissues)?

400

This technique uses ultrasound to help move topical medication into tissue.

What is phonophoresis?

400

This organelle is stimulated by light therapy to produce ATP.

What is the mitochondrion?

400

This formula is used to calculate laser dosage.

What is (average power × treatment time) / treatment area?

400

When using ultrasound, this type of tissue can absorb energy more efficiently than any other, requiring caution.

What is superficial bone?

500

These are the non-thermal effects of pulsed ultrasound.

What are: histamine release, enhanced protein synthesis, improved capillary density, and tissue regeneration—all without raising tissue temperature.  

500

 This tissue absorbs ultrasound energy at twice the rate of muscle.

What are peripheral nerves?

500

This classification of laser is the most powerful and potentially dangerous.

What is Class IV?

500

This response describes how low doses of light stimulate tissue repair while high doses inhibit pain.

What is the biphasic dose response?

500

When using laser therapy, this skin characteristic may absorb more light energy, requiring careful adjustment of dosage to avoid overheating.

What is darker skin pigmentation?