Light Therapy

Question 1

Therapeutic window of light

Answer 1

660 nm to 880 nm

Question 2

Bacetericidial blue light therapeutic wavelengths

Answer 2

400 nm

Not used therapeutically

Question 3

Collagen rebuilding - therapeutic wavelength -

Answer 3

580-590 nm

Question 4

Tissue repair/pain control - therapeutic wavelenth

Answer 4

600-1000nm

660-880 nm is more specific though for dynatronics

Question 5

The longer the wavelength of the light source - (penetration)

Answer 5

The deeper the penetration into the tissue

Shorter wavelength = lesser the penetration

Question 6

Infrared penetrates more

Answer 6

visible red (2-4cm)

Question 7

LASER

Answer 7

light amplification of stimulated emissions of radiation

Question 8

Laser is form of

Answer 8

electromagnetic energy

Question 9

Three unique properties for a laser

Answer 9

Coherence
Monochomaticity
Collimation

Question 10

Coherent light

Answer 10

One wavelength and beam is very focused

Question 11

Noncoherent light

Answer 11

Losing some of light energy because of non coherance

Question 12

Laser vs. LED wavelength

Answer 12

Laser = one very specific wavelength

LED light = one peak wavelength but others surrounding the peak as well

Question 13

Differences with laser and light

Answer 13

Laser = monochromatic (same wavelength 
Light = can be multiple wavelengths
Laser = no divergence of photons
Light = diverges
Laser = coherent 
Light = noncoherent

Question 14

Laser types

Answer 14

High power

Low power –> helium neon and gallium arsenide

Question 15

Helium neon laser

Answer 15

Red beam
Continuous wave
1-2 mm direct penetration
10-15 mm indirect

Question 16

Gallium Arsenide laser

Answer 16

Invisible
Pulse mode
1-2cm direct penetration
5 cm indirect

Question 17

Lasing technique options

Answer 17

Direct contact (on skin)
Scanning (10-15 cm or so above skin)

Question 18

Dosage reported as

Answer 18

J/cm2 (energy density)

Joule = 1 W/s

Question 19

Dosage is dependent on the

Answer 19

laser output in mW, the time of the exposer in seconds, and the beam surface area of the laser in cm2

Question 20

Energy is measured in

Answer 20

Joules or millijoules (mJ)

Question 21

Energy is a function of

Answer 21

power and time and a better determinant of the effects of light on tissue

Question 22

Energy =

Answer 22

power x time

Question 23

Energy density is measured in

Answer 23

HJoules/squared cm

Question 24

Preferred unit for reporting doses of treatment

Answer 24

Energy density

Question 25

Dosimetry

Answer 25

Therapeutic treatment depends on condition, in PT usually 1-8 J/cm2

Question 26

Important parameters for dosimetry

Answer 26

``` Power/power density Energy density Wavelength Duration of treatment Size of the area being treated ```

Question 27

Power is measured in

Answer 27

watts or milliwatts

Question 28

Power determines what

Answer 28

length of treatment

Question 29

Power and treatment time relationship

Answer 29

inverse

Question 30

Indications

Answer 30

``` Pain reduction Facilitate wound healing Inc scar tensile strength Dec inflammation Bone healing ```

Question 31

Contraindications

Answer 31

``` 4-6 months post radiation therapy Pregnant Malignancy Over eyes Over endocrine glands Over active bleeding Over epiphyseal plates, gonads, sympathetic ganglia, vagus nerve, chest ```

Question 32

Safety

Answer 32

Low level light not does injury eyes Protective glasses for laser treatments Do not look directly into light source

Question 33

Acute conditions

Answer 33

Laser density 0.05 to 0.5 J/cm2

Question 34

Subacute or chronic conditions

Answer 34

Laser density 0.5 to 3 J/cm2

Question 35

How many treatments for the effecct

Answer 35

3-6

Question 36

Pain management - trigger point

Answer 36

Probe held perpendicular to target with light contact on skin Treat distal to proximal Place joint in open position

Question 37

For superficial use what laser type

Answer 37

HeNe

Question 38

For deep use what laser type

Answer 38

GaAs

Question 39

Wound care - effects in vitro

Answer 39

FIbroblast proliferation Microphage stimulation Collagen synthesis Bactericidal

Question 40

Light technique - wound

Answer 40

Gridding (contact) Tip perpendicular to skin Scanning (no contact)Tip is perpendicular and 5-10 mm from skin Beam should fill area of 1 cm2

Question 41

Treatment recommendations EBP

Answer 41

3x per week Gridding technique Continue until re-epithelialization Minimal research

Question 42

Scar tissue remodeling

Answer 42

Hypertrophic scars Scar pain/edema Treat peripheray of scar due to dec vascular structure

Question 43

Edema and inflammation

Answer 43

Interrupts/inhibits foramtion of kinins, histamines, and prostaglandins Optimize cell membrane permeability

Question 44

Power density in treatment determines

Answer 44

How long a treatment should be and how destructive treatment can be

Question 45

Energy density =

Answer 45

power density x time