{HEAD ~ a recovering step} between {TAIL ~ step S5} and step S6, and the recovering step comprising: setting the voxel of which ADC value is no greater than the ADC threshold of the transition area as the foreground voxel, and finding the adjacent voxels of each foreground voxel of the first image 
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{ HEAD ~ a recovering step } between { TAIL ~ step S5 } and step S6 , and the recovering step comprising : setting the voxel of which ADC value is no greater than the ADC threshold of the transition area as the foreground voxel , and finding the adjacent voxels of each foreground voxel of the first image
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