Contrast phases

Last revised by Andrew Murphy on 07 Apr 2022

Contrast phases are terms used to describe different stages of contrast enhancement to blood vessels, following the introduction of a pressure injected intravenous (IV) contrast agent such as iodine in CT. 

Typical phases (time from injection) include: 

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Cases and figures

  • Case 1: early arterial phase (CTA)
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  • Case 2: late arterial phase
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  • Case 3: portal venous phase
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  • Case 4: nephrogenic phase
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  • Case 5: excretory phase
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