Ultravist® is an iodinated contrast agent with low osmolality and low viscosity, enabling ease of administration and rapid iodine delivery rate. Ultravist® is available in 4 concentrations. Introduced in Europe 1985 and in the US in 1995, Ultravist® is being used today in over 100 countries worldwide.
See also Low-Osmolar Contrast Media.

A venography (also called phlebography) is the imaging of veins. To perform a venography, a contrast agent is injected into a vein during a fluoroscopy, to show the details of venous structure and abnormalities as for example blood clots and occlusions. The examination of the veins is called venogram.
Other methods include contrast enhanced MR venography and venous ultrasound techniques.

See also Angiogram, CT Angiography, Digital Subtraction Angiography and Computed Tomography.

Visipaque is an iso-osmolar contrast agent. The osmolality equal to that of blood and the sodium and calcium concentration in a ratio equivalent to blood provides high patient safety and comfort.

VoLumen® is a low density barium sulfate contrast agent especially designed for MDCT (multi-detector row CT) and PET/CT exams to mark the bowel. Volumen is useful for CT studies of the small bowel and mesenteric vessels.
Positive oral contrast media may limit the delineation between soft bowel tissues and the lumen and may cause artifacts. Water or methyl-cellulose transits very rapidly and may limit bowel distention and soft tissue differentiation. Volumen, similar to water appears hypodense (low Hounsfield values) on CT scan and can be used in conjunction with IV contrast. VoLumen's low density formulation is well-suited for computed tomography enterography.