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A demonstration of τi from a selected animal at three scan days. Left column: Day0; middle column: Day2; right column: Day9. First row: the τi maps across the tumor; 2nd row: the identified BV (red area) within the tumor; 3rd row: the τi histograms. The tumor mean values of this animal are: Day0: τi = 0.159 s; Day2: τi = 0.170 s; Day9: τi = 0.193 s
