Saline flush during contrast administration

Andrew Murphy et al.

The saline flush during contrast administration otherwise known as a saline chaser is a secondary injection following the administration of contrast via a power injector. It is used in both MRI and CT. 

The primary purpose of the saline chaser is to ‘push’ the otherwise unused contrast in the peripheral vessels and contrast tubing. This mechanism allows for a reduction in contrast volume during and a decrease in the bolus artefact seen in the superior vena cava and brachiocephalic vein during CT contrast examinations. The saline ‘push’ also modifies the shape of the injected contrast bolus resulting in a steep drop in contrast enhancement due to the lack of lingering contrast arriving from the peripheries.

CT examinations
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Article information

rID: 69888
Section: Radiography
Synonyms or Alternate Spellings:
  • saline flush
  • saline bolus

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