Internal evaluation of impregnation treatment of waterlogged wood; relation between concentration of internal materials and relaxation time using magnetic resonance imaging |
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| Affiliation: | 1. Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan;2. Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Toksuhima City, Tokushima 770-8503, Japan;3. Gangoji Institute for Research of Cultural Property, 11, Chuin-cho, Nara City, Nara 630-8392, Japan;4. Clinical Radiology Service, Kyoto University Hospital, 54 Kawaharacho, Syogoin, Sakyo-ku, Kyoto 606-8507, Japan;1. Computational BioMedicine Laboratory, FORTH-ICS, Heraklion, Crete, Greece;2. Department of Medical Physics, University of Crete, Heraklion, Crete, Greece;3. Department of Radiology, University of Crete, Heraklion, Greece;1. Magnetic Resonance Imaging Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea;2. Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea;1. Department of Radiology, Nagoya City University Hospital, 1-Kawasumi, Mizuho-cho Mizuho-ku, Nagoya City, Aichi, 4678602, Japan;2. Division of Health Sciences, Graduate School of Medical Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 9200942, Japan;3. Department of Neurosurgery, Nagoya City University Hospital, 1-Kawasumi, Mizuho-cho Mizuho-ku, Nagoya City, Aichi, 4678602, Japan;1. Department of Medical Imaging, Ziekenhuis Oost-Limburg, Genk, Belgium;2. Department of Radiology, Hôpital Tenon, Paris, France;3. Department of Obstetrics & Gynecology, Ziekenhuis Oost-Limburg, Genk, Belgium;4. Faculty of Medicine and Biomedicine at Hasselt University, Diepenbeek, Belgium |
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| Abstract: | The purpose of this study is to clarify the degree of impregnation resulting from treatment of internal waterlogged wood samples using MRI. On a 1.5 T 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, − 2.73 ms/wt% (R2 = 0.880); external, − 1.50 ms/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, − 2.79 ms/wt% (R2 = 0.759); external, − 3.02 ms/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, 0.26 ms/wt% (R2 = 0.642); external, 0.18 ms/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, 0.06 ms/wt% (R2 = 0.175); external, − 0.14 ms/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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