Which catheter is primarily used for contrast injections and vessel visualization?

• A. Guiding catheter
• B. Microcatheter
• C. Sheath
• D. Angiography catheter

Answer: (D)

Angiography catheters are designed specifically for injecting contrast and producing images of the vessels. Their tip shape and near-tip delivery allow rapid, controlled injections into the vessel of interest, yielding clear fluoroscopic images for diagnostic visualization of the anatomy.

Other catheters serve different roles: guiding catheters are meant to engage the coronary ostia and provide support for device delivery, microcatheters are smaller and used for navigating into very small branches or delivering contrast in a super-selective manner, and sheaths are simply introducers to access the vessel and do not themselves optimize imaging.