Elapsed time changes of the brain radiopharmaceutical accumulation of the amyloid PET examination using <sup>18</sup>F-flutemetamol.

In both groups, all regions (Cortex, WC, Pons, CG, and WC + B) showed a trend of decrease gradually in pixel values with elapsed time after radiopharmaceutical administration.

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Results In most of the PET images, pixel values showed a decreasing trend with elapsed time after radiopharmaceutical administration.

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When the WC region was used as the reference, there was an increasing trend in the positive group, while no change was shown for the negative group.

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