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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.
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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
Contrast is excreted into the calices and into the renal collecting systems 1.
Excretory phase imaging allows the detection of renal lesions, urothelial cancer parapelvic cysts, calyceal diverticula and urinary extravasation after renal trauma 2.
- 1. Yuh BI, Cohan RH. Different phases of renal enhancement: role in detecting and characterizing renal masses during helical CT. (1999) AJR. American journal of roentgenology. 173 (3): 747-55. doi:10.2214/ajr.173.3.10470916 - Pubmed
- 2. Keihani S, Putbrese B, Rogers D et al. Optimal Timing of Delayed Excretory Phase Computed Tomography Scan for Diagnosis of Urinary Extravasation After High-Grade Renal Trauma. J Trauma Acute Care Surg. 2019;86(2):274-81. doi:10.1097/ta.0000000000002098 - Pubmed