Sobol Emil N, Sviridov Alexander P, Kitai Moishe S, Edwards Glenn S
Institute of Laser and Information Technologies of the Russian Academy of Sciences, Troitsk 14210, Russia.
Appl Opt. 2003 May 1;42(13):2443-9. doi: 10.1364/ao.42.002443.
Like pure water, the water incorporated into cartilage and cornea tissue shows a pronounced dependence of the absorption coefficient on temperature. Alteration of the temperature by radiation with an IR free-electron laser was studied by use of a pulsed photothermal radiometric technique. A computation algorithm was modified to take into account the real IR absorption spectra of the tissue and the spectral sensitivity of the IR detector used. The absorption coefficients for several wavelengths within the 2.9- and 6.1-microm water absorption bands have been determined for various laser pulse energies. It is shown that the absorption coefficient for cartilage decreases at temperatures higher than 50 degrees C owing to thermal alterations of water-water and water-biopolymer interactions.
与纯水一样，融入软骨和角膜组织中的水的吸收系数对温度有显著依赖性。利用脉冲光热辐射技术研究了用红外自由电子激光辐射改变温度的情况。修改了一种计算算法，以考虑组织的实际红外吸收光谱和所用红外探测器的光谱灵敏度。针对不同的激光脉冲能量，测定了2.9微米和6.1微米水吸收带内几个波长的吸收系数。结果表明，由于水-水和水-生物聚合物相互作用的热变化，软骨的吸收系数在高于50摄氏度时会降低。
