Excretory phase

The excretory phase also known as the urographic phase is a postcontrast injection time range in which there is an optimal enhancement of the renal collecting systems.

Technique

The acquisition time depends on the intravenous device (central or peripheral), the concentration of the contrast medium, and the injection rate ¹.

• time from injection through an upper extremity vein
  • 5-10 minutes

Physiology

Contrast is excreted into the calices and into the renal collecting systems ¹.

Clinical use

Excretory phase imaging allows the detection of renal lesions, urothelial cancer parapelvic cysts, calyceal diverticula and urinary extravasation after renal trauma ².

See also

• early arterial phase
• late arterial phase
• portal venous phase
• nephrogenic phase