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Flashcards in US Deck (11)
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1
Q

Transverse waves

A

Perpendicular to energy flow

Only travel through solids (bone)

2
Q

What frequency is US?

A

> 20 kHz

  • audible sound is 16kHz-20kHz*
  • US is 0.75 and 3MHz*
3
Q

Blood, body fluids, and fat (high water content) have…

A

Low acoustic impedance: high transmission, low absorption (waves go right through it)

travel to deeper tissues

4
Q

Bone, muscle, peripheral nn., and collagen (high protein content) have…

A

High acoustic impedance: low transmission, high absorption

high absorption, so less is available for transmission to deeper tissues

5
Q

1MHz

A

For deep tissues
Transmitted through superficial, absorbed by deep (2-5cm)
Good for high cutaneous fat and deep heat

6
Q

3MHz

A

For superficial tissues
Absorbed by superficial (1-2cm)
Heats faster than 1MHz (higher frequency –> higher energy) ==> absorbed 3x faster than 1MHz - more comfortable

7
Q

Can continuous US produce non-thermal effects?

A

At

8
Q

Clinical application

A
Soft tissue healing and repair
Scar tissue and joint contracture 
Chronic inflammation 
Bone healing 
Assessing stress fx's
Wound healing
9
Q

indications (17)

A
Acute and subacute conditions (non-thermal)
Soft tissue healing and repair
Scar tissue
Joint contracture
Chronic inflammation 
Increase extensibility of collagen
Reduction of muscle spasm
Pain modulation
Increase BF
Soft tissue repair
Increase in protein synthesis 
Tissue regeneration
Bone healing
Repair of nonunion fx's
Inflammation associated w/ myositis ossificans 
Plantar warts
Myofascial trigger points
10
Q

Contraindications (14)

A
Acute and post acute conditions (thermal)
Areas of decreased temp sensation
Areas of decreased circulation
Vascular insufficiency 
Thrombophlebitis 
Eyes
Reproductive organs
Pelvis immediately following menses
Pregnancy 
Pacemaker
Malignancy 
Epiphyseal areas in young children
Total joint replacements 
Infection
11
Q

Longitudinal waves

A

|| to energy flow

Travel through both solids and liquids