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VT errors as a function of translational (a) and rotational (b) motions. The [11C](R)-rolipram (○) data are from the present study. The values for [11C](R)-verapamil (■) and [11C]-flumazenil (●) are from [2]. VT errors increase as motion increases. The amount of error observed with the blood-based method ([11C](R)-rolipram) is smaller than the number of errors observed with the blood-free method ([11C](R)-verapamil and [11C]-flumazenil).
