Which statement about retrograde imaging is correct?

Which statement about retrograde imaging is correct?

• A. Against natural flow
• B. With natural flow
• C. Not used in angiography
• D. Only used in venous imaging

Answer: (A)

Retrograde imaging means filling and visualizing vessels by pushing contrast against the direction of the normal blood flow. This approach helps visualize segments that don’t opacify well with flow in the natural direction, such as when an artery is occluded or when you want to delineate collateral pathways. In angiography, you can position the catheter so contrast is injected retrogradely to fill the proximal vessels or upstream branches, opposite to the usual flow. Therefore, the correct statement is that retrograde imaging is against natural flow. It’s used in angiography and isn’t limited to venous imaging, and it’s not performed with the flow in the natural direction.

Retrograde imaging means filling and visualizing vessels by pushing contrast against the direction of the normal blood flow. This approach helps visualize segments that don’t opacify well with flow in the natural direction, such as when an artery is occluded or when you want to delineate collateral pathways. In angiography, you can position the catheter so contrast is injected retrogradely to fill the proximal vessels or upstream branches, opposite to the usual flow. Therefore, the correct statement is that retrograde imaging is against natural flow. It’s used in angiography and isn’t limited to venous imaging, and it’s not performed with the flow in the natural direction.