title: Internal evaluation of impregnation treatment of waterlogged wood; relation between concentration of internal materials and relaxation time using magnetic resonance imaging.
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 1.5T MR scanner, T1and T2measurements 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.
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan; Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Toksuhima City, Tokushima 770-8503, Japan. Electronic address: yk@tokushima-u.ac.jp.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kanazawa
authors.affiliation: Gangoji Institute for Research of Cultural Property, 11, Chuin-cho, Nara City, Nara 630-8392, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yamada
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Aki
authors.initials: A
authors.lastname: Kido
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Fujimoto
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Kyoko
authors.initials: K
authors.lastname: Takakura
authors.affiliation: Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Toksuhima City, Tokushima 770-8503, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Hayashi
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Fushimi
authors.affiliation: Clinical Radiology Service, Kyoto University Hospital, 54 Kawaharacho, Syogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kozawa
authors.affiliation: Clinical Radiology Service, Kyoto University Hospital, 54 Kawaharacho, Syogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Koizumi
authors.affiliation: Gangoji Institute for Research of Cultural Property, 11, Chuin-cho, Nara City, Nara 630-8392, Japan.
authors.forename: Makiko
authors.initials: M
authors.lastname: Okuni
authors.affiliation: Gangoji Institute for Research of Cultural Property, 11, Chuin-cho, Nara City, Nara 630-8392, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Ueda
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Togashi
mesh_terms: D008279:Magnetic Resonance Imaging; D011092:Polyethylene Glycols / Q000737:chemistry; D015203:Reproducibility of Results; D014199:Trehalose / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*
chemical_list: D014867:Water; D011092:Polyethylene Glycols; D014199:Trehalose
keywords: Conservation science; Impregnation treatment; Magnetic resonance imaging (MRI); Relaxation time; Repair operation; Waterlogged wood