3.1.2. Estimation of gas bubble content
Although as stated in previous section, the air spaces near the
seeds disappeared, very small gas bubbles developed in the outer
pericarp of few tomatoes. Gas bubble content (volume of gas bubbles
per voxel) was estimated by dividing the 40ms echo time
images by corresponding 9 ms echo time images. The relative signal
depended on the tomato tissues, according to the results of our
previous study (Musse et al., 2009). It remained almost constant
throughout the ripening process for each type of tissue (core, placenta,
radial pericarp and locular tissues), except the outer pericarp,
and for all of the tomatoes studied in both experiments. The relative
signal of the outer pericarp was constant for seven of nine
tomatoes in Experiment 1. However, for the remaining two tomatoes
it was homogeneous at the beginning of the experiment but
3.1.2. Estimation of gas bubble content
Although as stated in previous section, the air spaces near the
seeds disappeared, very small gas bubbles developed in the outer
pericarp of few tomatoes. Gas bubble content (volume of gas bubbles
per voxel) was estimated by dividing the 40ms echo time
images by corresponding 9 ms echo time images. The relative signal
depended on the tomato tissues, according to the results of our
previous study (Musse et al., 2009). It remained almost constant
throughout the ripening process for each type of tissue (core, placenta,
radial pericarp and locular tissues), except the outer pericarp,
and for all of the tomatoes studied in both experiments. The relative
signal of the outer pericarp was constant for seven of nine
tomatoes in Experiment 1. However, for the remaining two tomatoes
it was homogeneous at the beginning of the experiment but
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