頁籤選單縮合
題 名 | The Change in Tissue Near-Infrared Spectrum with Temperature |
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作 者 | Tsai,Cheng-lun; Yang,Chia-yu; | 書刊名 | 醫學工程 |
卷 期 | 10:3 1998.06[民87.06] |
頁 次 | 頁53-58 |
分類號 | 410.1644 |
關鍵詞 | Temperature measurement; Near-infrared spectroscopy; Monte carlo simulation; |
語 文 | 英文(English) |
英文摘要 | Tissue temperature measurement is important to thermotherapy. During a thermotherapy, the amount of energy introduced into the body has to be carefully controlled in order to maintain the tissue temperature in between 42 ℃ and 45 ℃. The purpose of this research is to study the possibility of using the near-infrared spectrum to measure the tissue temperature. Water has distinct near-infrared absorption peaks at 970nm, 1190nm and 1450nm, and their absorption property vary with temperature. Since biological soft tissue has very high water content, its temperature could be measured by detecting the change in near-infrared spectrum. A near-infrared spectroscopy system and a temperature controlled sample holder were built to measure the spectra of water, gelatin, and pork at different temperature. The position of absorption peak was determined from their First difference spectra. A Monte Carlo simulation was also used to evaluate the penetration depth and path length of near-infrared light in tissue. The absorption peak of water, gelatin, and pork were all found to shift to the left as temperature increased. From the result of Monte Carlo simulation, the average path length of photons was between 5.2mm and 6.2mm, and the penetration depth was about 2.5mm to 3mm. The temperature sensitivity measured in this study was about 0.4 nm℃ for biological tissue. This measurement could be improved by using an array spectrometer with high spectral resolution. |
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