James Carroll, THOR Photomedicine Ltd This work is distributed

James Carroll, THOR Photomedicine Ltd

This work is distributed under license under a Creative Commons

Attribution-NonCommercial-NoDerivs 3.0 Unported License.

Original file located here

http://en.wikipedia.org/wiki/Creative_Commons_licenses

Background

• LLLT is commonly used for treating musculoskeletal pain• Some of the targets are several cm deep

• How much light at the surface of the skin is required to produce adequate irradiance at the target

• What is the effect of pressure

Objective

• To measure the irradiance in the region of a thoracic facet joint in a pig

Materials & Methods

810nm 200mW laser penetration depth

Part 1. Single point vs cluster

Part 2. The effect of spot size

Part 3. LED vs laser

Part 4. The effect of pressure

Part 1. Single point vs cluster

Are 5 x single point laser treatments the same as 5 lasers at once?

Materials

Methods

6mm dia0.28cm2

Power meter detector Various layer of bacon

Bacon thickness confirmed with digital vernier

Single vs laser cluster

Bacon thickness 30mm

5 x 200mW laser Cluster200mW single laser

Part 2. The effect of spot size

Smaller spot size = greater penetration

66.6 8 3.4 .9 .2

0.530.57

810nm W/cm2

Part 3. Laser vs LED

Results

Bacon thickness 30mm

Laser ClusterLaser SingleLED Cluster

Part 3. The effect of pressure

Fibre0.9mm dia0.0063cm2

Power Density @ 3cm

810nm 5 x 200mW 5W./cm2 810nm 200mW 5W./cm256 x 660nm 10mW/50mWcm2 35 x 48 x 850nm/150mW/cm2

Power Density @ 3cm

Power Density @ 5cm

Conclusion

• Pressure increases irradiance • 5 lasers are better than 1 (the power density accumulates due to

combined effect of scatter)

• 810nm 1W (5 x 200mW) achieves 10mW/cm2 @ 3cm• 810nm 1W (5 x 200mW) achieves 1mW/cm2 @ 5cm• Uncertain how much irradiance or fluence required at the facet

joints

Limitations

• No accounting for W/cm3 (≈ ten times higher readings expected had isotropic detector been used)

• Fibre movement• Pig not a human

James Carroll, THOR Photomedicine Ltd

This work is distributed under license under a Creative Commons

Attribution-NonCommercial-NoDerivs 3.0 Unported License.

Original file located here

http://en.wikipedia.org/wiki/Creative_Commons_licenses

James Carroll, THOR Photomedicine Ltd This work is distributed

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