Presumptive diagnosis of dwarfed Japanese pear by using a mobile magnetic resonance imaging system

利用移动磁共振成像系统对矮化日本梨进行推定诊断

• 批准号: 23658024
• 负责人: GEMMA Hiroshi
• 金额: $ 2.5万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-23658024/
• 关键词: ナシ; 萎縮症; MRI; 非破壊計測; 生体情報; ニホンナシ; 水分生理; 水ポテンシャル; 樹液流動; 非破壊検査; 果樹

This study was carried out to focus upon the water relation of branches of Japanese pear with the dwarfed symptom by using the novel mobile MRI (magnetic resonance imaging) system incorporated with the measurement of sap flow, water potential, root activity and so forth. As a marker of MRI, T1, T2, and proton density in the cross sections of the sound and diseased branches, show clearly the high density of mobile water protons around the xylem located close to the external surface ofthe branches. In the ADC maps, the diseased branch has no definite high ADC area while the sound branch clearly shows. This difference clearly shows that the water transport function is degraded or destroyed in the diseased branch. A diurnal change of ADC in the branch corresponds clearly the water transport in the pear tree branch which shown in the real sap flow pattern in a whole day. The sap flow shows remarkably lower value in the diseased branch from sprouting until leafing stage than sound branch, but comparable value over leafing stage. From these results, a mobile MRI system will be an available tool of the presumptive diagnosis for dwarf Japanese pear using non destructive measurement.

采用新型移动的MRI（magnetic resonance imaging）系统，结合树干液流、水势、根系活力等测量，对日本梨矮化症状枝条的水分关系进行了研究。作为MRI的标志，T1、T2和质子密度在健康和患病枝条的横截面上，清楚地显示了移动的水质子在靠近枝条外表面的木质部周围的高密度。在ADC图上，病变分支无明确的高ADC值区，而健全分支显示清晰。这种差异清楚地表明，在患病的分支中，水运输功能被退化或破坏。分支的ADC日变化与梨树分支的水分输送有明显的对应关系，表现为一整天内真实的液流模式。病株分支的液流在萌芽至抽叶期显著低于健株分支，但在抽叶期与健株相当。从这些结果来看，移动的MRI系统将是一个有效的工具，推定诊断日本矮化梨使用非破坏性测量。

项目成果

Development of a mobile magnetic resonance imaging system for outdoor tree measurements

• DOI: 10.1063/1.3589854
• 发表时间: 2011-05-01
• 期刊: REVIEW OF SCIENTIFIC INSTRUMENTS
• 影响因子: 1.6
• 作者: Kimura, Takeshi;Geya, Yuto;Sekozawa, Yoshihiko
• 通讯作者: Sekozawa, Yoshihiko

小型モバイルMRIによるニホンナシ萎縮症の早期診断

使用小型移动 MRI 早期诊断日本梨萎缩

• 发表时间: 2012
• 作者: Kimura,T.;Geya,Y.;Terada,Y.;Kose,K.;Haishi,T.,Gemma,H.and Sekozawa;Y.;後藤賢子・神田啓臣・栗原正人・坂本政臣・村山秀樹;弦間 洋・坂田麻衣・木村武史・瀬古澤由彦・菅谷純子・巨瀬勝美
• 通讯作者: 弦間 洋・坂田麻衣・木村武史・瀬古澤由彦・菅谷純子・巨瀬勝美