Question:medium
A dense nephrogram is obtained by:
A dense nephrogram is obtained by:
Show Hint
Density depends on peak arterial contrast concentration, so push it fast.
Updated On: Jun 24, 2026
- Dehydrating the patient
- Increasing the dose of contrast media
- Rapid (bolus) injection of dye
- Using non-ionic media
Show Solution
The Correct Option is C
Solution and Explanation
Think about what makes the kidney glow brightly after contrast. The nephrogram brightness reflects how concentrated the contrast is in the renal parenchyma at the moment of imaging, and that in turn depends on how high the arterial iodine concentration spikes.
A fast bolus is the lever that controls this. Pushing the whole dose in over a few seconds sends a tight, high-concentration slug of contrast through the renal arteries, so a large quantity of iodine is filtered simultaneously and the parenchyma lights up densely.
Weigh the alternatives. Dehydration helps a urogram by concentrating contrast downstream in the collecting system, not by intensifying the early parenchymal phase. Giving more total contrast slowly spreads it out and never reaches the same instantaneous peak. The ionic versus non-ionic choice changes osmolality and patient safety, not the density of the blush.
The single manoeuvre that creates a dense nephrogram is therefore the rapid bolus.
\[\boxed{\text{Rapid (bolus) injection of dye}}\]
A fast bolus is the lever that controls this. Pushing the whole dose in over a few seconds sends a tight, high-concentration slug of contrast through the renal arteries, so a large quantity of iodine is filtered simultaneously and the parenchyma lights up densely.
Weigh the alternatives. Dehydration helps a urogram by concentrating contrast downstream in the collecting system, not by intensifying the early parenchymal phase. Giving more total contrast slowly spreads it out and never reaches the same instantaneous peak. The ionic versus non-ionic choice changes osmolality and patient safety, not the density of the blush.
The single manoeuvre that creates a dense nephrogram is therefore the rapid bolus.
\[\boxed{\text{Rapid (bolus) injection of dye}}\]
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