Аннотация
In general, magnetic resonance imaging (MRI) is used to obtain a spatial
representation of the water distribution in an object. Water in soft
materials (living matter) often shows a high degree of translational
mobility, giving rise to relatively long magnetic relaxation times.
This allows the use of conventional MRI techniques such as the spin-echo,
to acquire an image. However, when hydration levels become low, water
becomes less mobile, resulting in much shorter magnetic relaxation
times and a corresponding signal loss. To avoid problems arising
from rapid decaying signals, we investigated the use of single point
imaging (SPI) in the study of seeds. We were able to obtain SPI images
of nonimbibed and imbibed seeds. Using SPI with shaped gradients
significantly reduced the acoustic noise level.
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