The document graphically illustrates how scan delay is determined based on measured contrast arrival time and additional diagnostic delay needed for the scan. It shows the relationship between contrast injection, tissue enhancement, and optimal scan timing variables. The graph aids in selecting the proper scan delay for diagnostic imaging after measuring contrast arrival in a patient.

1. Graph of contrast medium injection, enhancement, and scan time variables illustrates the
determination of scan delay from measured contrast material arrival time (Tarr) and additional
diagnostic delay.
Bae K T Radiology 2010;256:32-61
©2010 by Radiological Society of North America