Digital images can be manipulated for evaluation in various ways. Post-processing includes: Subtraction, addition, rotation, inversion, multiplanar reconstruction (MPR), maximum intensity projection (MIP), etc.
Subtraction is particularly useful in contrast enhanced examinations. The pre contrast images are subtracted from the images after an injection of contrast agents (sometimes also called dye) for better tumor detection. See also Contrast Enhanced Computed Tomography, Digital Subtraction Angiography and Active Zone.

Prepcat (brand name Lafayette) is a barium sulfate suspension for computed tomography examinations of the gastrointestinal (GI) tract. The dosage and application depend on the specific procedure.
UPPER G.I. OPACIFICATION: The patient should drink 300 mL of ready-to-use Prepcat approximately 2 hours before the CT scan and an additional 300 mL approximately 15 minutes prior to examination.
If rapid upper gastrointestinal tract transit is desired, administer the product chilled.
TOTAL BOWEL OPACIFICATION: The patient should drink 300 mL the night preceding the examination, 300 mL two hours prior to the examination and 300 mL approximately 15 minutes prior to examination.

The basis of pulmonary scintigraphy is the detection of gamma rays emitted from the lung after administration of a radioactive tracer.
See Lung Scintigraphy.

See also Aerosol Ventilation Scintigraphy, Gas Ventilation Scintigraphy, Pulmonary Perfusion Scintigraphy, Computed Tomography Pulmonary Angiography and Lung Imaging.

Reno-60® is radiopaque contrast agent with a wide range of indications. Reno-60 should be at body temperature when injected and may need to be warmed before use. Following intravascular injection, iodinated contrast materials are transported through the bloodstream to the kidneys and excreted by glomerular filtration.

The range of diagnostics and imaging systems of Siemens Medical Systems covers ultrasound, nuclear medicine, angiography, magnetic resonance, computer tomography and patient monitoring.