Optical phantom materials for near infrared laser photocoagulation studies
✍ Scribed by Iizuka, Megumi N.; Sherar, Michael D.; Vitkin, I. Alex
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 195 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0196-8092
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✦ Synopsis
Background and objective:
Phantoms were developed that simulate tissue with dynamic and static optical properties with which to study the effects of laser irradiation.
Study design/materials and methods:
Albumen, agar, and an absorbing dye (naphthol green) were combined to form a phantom with heat sensitive optical properties to mimic tissue response. the optical properties of this phantom were measured by using the added absorber technique. a polyacrylamide phantom with static optical properties was designed with the equivalent values of micro(a) and micro'(s) by combining appropriate concentrations of naphthol green and intralipid-10%.
Results:
The absorption and reduced scattering coefficient of the phantoms were 0. 50 +/- 0.04 cm(-1) and 2.67 +/- 0.07 cm(-1) respectively, in the native state at 805 nm. in the coagulated state, the absorption and scattering coefficient were 0.7 +/- 0.1 cm(-1) and 13.1 +/- 0.5 cm(-1) respectively.
Conclusion:
Two phantoms with dynamic or static optical properties were developed with properties similar to tissue. they may be used in future studies of opto-thermal effects in tissues.