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FIG 3. Time to entrance of the contrast material into the arterial pixel and time to exit of the contrast material in the venous and ischemic pixels, displayed for the four bolus volume groups. Boxes represent the mean ± 1 SD, and vertical lines indicate the mean ± 2 SDs. Time to arterial entrance does not vary with bolus volumes. However, time to exit does increase with increasing bolus volumes, resulting in longer acquisition times required for larger bolus volumes.
