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


Image of FIG. 1.
FIG. 1.

(a) Overview of the electrically motorized mobile MRI system using a permanent magnet. (b) Close view of the permanent magnet with two rotation axes and two horizontally sliding tables. The rotation axes are vertical and horizontal axes.

Image of FIG. 2.
FIG. 2.

(a) RF coil wound around a branch of a pear tree. (b) Open view of the RF probe. (c) Electromagnetically shielded RF probe with a shielding cloth wound over the RF probe. (d) Setup of the RF probe in the gap of the permanent magnet. The magnet has two rotation axes and three translational mechanisms.

Image of FIG. 3.
FIG. 3.

Cross sectional MR images and profiles of a branch of a pear tree. (a) and (c) : No RF shielding. (b) and (d) : RF shielding with the shielding cloth.

Image of FIG. 4.
FIG. 4.

Computed T1, T2, and proton density images of branches of a pear tree. (a)-(c) Normal branch. (d)-(f) Diseased branch.

Image of FIG. 5.
FIG. 5.

Diffusion weighted and ADC images of normal (a)-(c) and diseased (d)-(f) branches. (a) and (d) b = 0 s/mm2. (b) and (e) b = 314 s/mm2. (c) and (f) ADC images.

Image of FIG. 6.
FIG. 6.

Whole day variation of solar radiation (closed circle) and ADC measured in two regions of the normal branch. The square and triangle show ADC in the sapwood and heartwood.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Development of a mobile magnetic resonance imaging system for outdoor tree measurements