EXCRETORY SYSTEM
URETER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In which Phase of MRI is the contrast concentrated in the renal collecting system?
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Precontrast Phase
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nephrographic stage
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Excretory Phase
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None of the above
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Explanation:
Detailed explanation-1: -After contrast injection, enhancement can be detected in real time for up to 5–7 minutes in the liver or spleen. However, kidneys enhance for a shorter period of time. The arterial pedicle and main branches pick up the agent first. After a few seconds, the cortex enhances, followed by medullary perfusion.
Detailed explanation-2: -A renal CT is performed in 3–4 phases: the native, arterial (20-to 40-s delay), the venous (100-to 150-s delay) and the excretory phase (180-to 300-s delay).
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