Podcast
Questions and Answers
What is the highest acceptable Beam Nonuniformity Ratio (BNR) in the US?
What is the highest acceptable Beam Nonuniformity Ratio (BNR) in the US?
- 6:1 (correct)
- 4:1
- 5:1
- 7:1
Carpal tunnel syndrome is a contraindication for ultrasound treatment.
Carpal tunnel syndrome is a contraindication for ultrasound treatment.
False (B)
Name two thermal indications for ultrasound treatment.
Name two thermal indications for ultrasound treatment.
Pain control and tendon injury chronic.
The proper technique for using ultrasound requires keeping the sound head moving to avoid creating high energy concentration which can lead to damaging the ___________ tissue.
The proper technique for using ultrasound requires keeping the sound head moving to avoid creating high energy concentration which can lead to damaging the ___________ tissue.
Match the following ultrasound effects with their descriptions:
Match the following ultrasound effects with their descriptions:
Flashcards
US Beam Peak Power Ratio
US Beam Peak Power Ratio
The ratio of peak power to average power in an ultrasound beam. A 6:1 ratio is the maximum acceptable limit in the U.S.
Thermal Ultrasound Indications
Thermal Ultrasound Indications
Conditions where thermal effects of ultrasound are beneficial, such as pain relief or tissue reabsorption.
Non-Thermal Ultrasound Indications
Non-Thermal Ultrasound Indications
Conditions where non-thermal effects (like improved healing) are the desired outcome. Examples include vascular and pressure ulcers.
Ultrasound Contraindications
Ultrasound Contraindications
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Ultrasound Technique Modifications
Ultrasound Technique Modifications
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Study Notes
US Beam Power Ratio
- Peak power to average power ratio in US beam: 6:1
- This is the highest acceptable Beam-to-Noise Ratio (BNR)
- Improper technique can lead to dangerously high tissue heating.
Indications for US
- Thermal:
- Pain relief
- Preparing shortened tissue for stretching
- Treating chronic tendon injuries
- Calcium deposit reabsorption
- Non-thermal:
- Healing vascular and pressure ulcers
- Treating acute tendon injuries
- Treating carpal tunnel syndrome
- Treating surgical incisions
- Phonophoresis to reduce inflammation
Contraindications for US
- Cancer
- Pregnancy (abdominal or back)
- Pacemaker
- Central Nervous System (CNS) tissue (laminectomy)
- Joint cement or implants
- Deep Vein Thrombosis (DVT)
- Over the eyes
- Carotid sinus
- Reproductive organs
- All thermal US applications
Proper Technique and Modifications
- Patient response-based adjustments: Pause treatment and lower intensity if needed.
- Frequency change: 1 MHz to 3 MHz (more superficial) for periosteum healing.
- Head movement and treatment area: Faster head movement and increased treatment areas.
- Even contact: Maintain even contact parallel to the skin to avoid high energy concentrations.
- Head size and contact: Use smaller probe heads for full contact over bony prominences or for indirect underwater treatment.
- Sound head and air: Avoid having the sound head in air; it will break the crystal.
Thermal and Non-thermal Effects
- Microstreaming: Currents around cavitation-created gas bubbles, agitation of cell membranes, and increased ion permeability.
- Acoustic streaming: (Implied, but not explicitly defined)
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