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Axial T1-weighted MR images (600/15 ms [TR/TE]) before (A) and after (B) contrast administration. In this example, the SI of the supraglottic mass increases from 312 to 521 within tumor area (arrows), leading to a degree of contrast enhancement of (521–312)/ 312 = 67%. The tumor was considered as a low-enhanced tumor, which locally recurred within 11 months after RT.
