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Figure 1b. Fusion of a T2-weighted fast SE transverse image in gray value with partly opaque rendered color overlay of four contrast enhancement parameters (see text for detailed explanation of parameters). (a) Transverse T2-weighted fast SE image obtained through the prostate demonstrates a low-signal-intensity lesion (T) in the left peripheral zone with bulging (arrows) and obliteration (arrowheads) of the rectoprostatic angle. (b) The start-of-enhancement parameter demonstrates an earlier enhancement in part of the low-signal-intensity lesion (arrows) compared with the right peripheral zone (red vs green). (c) Fast time to peak (red) is present in the left peripheral zone (arrows) and right central gland (arrowheads). (d) Peak enhancement is increased markedly in the center of the lesion in the left peripheral zone (arrows) and right central gland (arrowheads). (e) A negative washout area (red) is seen in the left peripheral zone (arrows) and right central gland (arrowheads). (f) Photomicrograph shows stage T3a disease with prostate capsule penetration in the left peripheral zone (arrows) and a prostate tumor lesion (red) in the right central gland (arrowheads).
