The penetration depth of Nd:YAG laser on dermis
| Autor: | Kuo-Ming Yang, 楊國銘 |
|---|---|
| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 Laser is widely applied to treat many disorders of skin such as tattoo, naevia, and rhytides in dermatology and orthopaedics. However, the knowledge about theoretical formulation for laser and apparent penetration �唌� of skin rupture is still very limited. We suggest that apparent penetration �唌� is correlated with skin depth ���| In this study, the armpit of swine dermis was irradiated by Nd:YAG laser at 1064 and 532 nm. The apparent penetration �唌� of dermis was measured by paraffin section and SEM. The measured apparent penetration �唌� was used to analyze the relationship between the �唌� and the wavelengths. Clay was used to estimate the volume of skin rupture and the volume at 1064 nm was compared with that at 532 nm at the same power. The �捯 and �� of dermis were calculated by extrapolation to be 0.73 and 246.31 S/m at 1064 nm and 0.57 and 331.01 S/m at 532 nm, respectively. The Q value was used (43.07 at 1064 nm and 59.48 at 532 nm) to calculate the skin depth ���nof both wavelength in dermis. The results showed that (1) the apparent penetration �唌� was dependent on the wavelength of laser, (2) the �唌� at 1064 nm was about 7.5 ~ 25 �慆 from 300 to 1000 mJ, the �唌� at 532 nm was 5 ~ 9 �慆 from 300 to 500 mJ, and �唌� at 1064 nm was 40 ~ 41% deeper than that at 532 nm, (3) the skin depth �� at 1064 and 532 nm was calculated to be 17 and 12 �慆, respectively, (4) the ruptured volume of dermis at both wavelengths was identical under the same total power was delivered. These results suggest that apparent penetration �唌� correlates with skin depth ��. The wavelength is independent on ruptured volume of dermis. |
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