Internal evaluation of impregnation treatment of waterlogged wood; relation between concentration of internal materials and relaxation time using magnetic resonance imaging

Publication date: May 2017
Source:Magnetic Resonance Imaging, Volume 38
Author(s): Yuki Kanazawa, Tetsuya Yamada, Aki Kido, Koji Fujimoto, Kyoko Takakura, Hiroaki Hayashi, Yasutaka Fushimi, Satoshi Kozawa, Koji Koizumi, Makiko Okuni, Naomi Ueda, Kaori Togashi
The purpose of this study is to clarify the degree of impregnation resulting from treatment of internal waterlogged wood samples using MRI. On a 1.5T MR scanner, T1 and T2 measurements were performed using inversion recovery and spin-echo sequences, respectively. The samples were cut waterlogged pieces of wood treated with various impregnation techniques which were divided into different concentrations of trehalose (C12H22O11) and polyethylene glycol (PEG; HO-(C2H4O)n-H) solutions. Then these samples underwent impregnation treatment every two weeks. From the results, we found that the slope of the T1-concentration curve using linear fitting showed the value of the internal area for PEG to be higher than the external area; internal, −2.73ms/wt% (R²=0.880); external, −1.50ms/wt% (R²=0.887). Furthermore, the slope of the T1-concentration curve using linear fitting showed the values for trehalose to have almost no difference when comparing the internal and the external areas; internal, −2.79ms/wt% (R²=0.759); external, −3.02ms/wt% (R²=0.795). However, the slope of the T2-concentration curve using linear fitting for PEG showed that there was only a slight change between the internal and the external areas; internal, 0.26ms/wt% (R²=0.642); external, 0.18ms/wt% (R²=0.920). The slope of the T2-concentration curve did not show a change in linear relationship between the internal and the external areas; internal, 0.06ms/wt% (R²=0.175); external, −0.14ms/wt% (R²=0.043). In conclusion, using visualization of relaxation time T1, it is possible to obtain more detail information noninvasively concerning the state of impregnation treatment of internal waterlogged wood.



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