Fig. 3
From: Detection of parathyroid adenomas with multiphase 4DCT: towards a true four-dimensional technique
Enhancement (Y-axis) over time (X-axis) curve. The curve for the suspected parathyroid (yellow) is steeper than the curve for the thyroid (green), and the peaks for the artery (red) and vein (blue) are higher in comparison. An artifact due to motion is observed at 34 s with suboptimal HU measurement of the small parathyroid lesion. The graph also demonstrates venous wash-out of the suspected parathyroid (50–70 s). Additionally, note the lack of prominent difference in enhancement between the adenoma and the thyroid at 25 s after administration of contrast. The purple curve indicates slow continuous enhancement of a lymph node