A slice is a tomographic section of an object. A slice is defined by position and thickness; each slice is divided into a matrix of voxels. In computed tomography, a motorized table slips the patient through the gantry and slices are made when the x-ray tube rotates in a circle around the patient.

Syringeless CT power injectors (also called pressure injectors) have been developed as a solution to reduce contrast fluid waste. The Joint Commission does not allow the reuse of unused cans from disposable syringes, so the syringeless option allows facilities to use contrast media as efficiently as possible.
A syringeless CT (computed tomography) contrast media injector permits delivery to be made directly from standard contrast media bottles, featuring multi-dosing and programmable automatic saline flush. This higher loading capacity for contrast agent ( up to two contrast bottles or 1000 ml) and a bag of saline at initial setup, enables to perform multiple contrast enhanced CT scans without reloading contrast agent; resulting in increased efficiency and less waste.

See also Single-Head Contrast Media Injector, Dual-Head CT Power Injector, CT Power Injector, Multi-Head Contrast Media Injector.

Tomocat® is a concentrated strawberry flavored barium sulfate suspension. Tomocat® can be used as an oral or rectal (colon) contrast medium for computed tomography of the gastrointestinal tract. The quantity and the barium sulfate concentration will depend upon examination, used technique, clinical needs and patient size.

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.