Ultrasound scanning is performed by a specifically trained Sonographer, who uses the ultrasound machine to obtain images on a screen, usually in black and white. These images are stored electronically and can be printed out for viewing, but most of the information is gained by an experienced sonographer during the actual examination. This can be likened to shining a torch in a dimly-lit room; this dynamic process allows the operator to build up a mental image in three dimensions, from a series of two-dimensional “slices”. A variety of ultrasound probes are available, each being suited to the particular task or body area. A special gel is applied to the body, for example on the abdomen, to form an acoustic interface with the probe. The gel may be cold but is otherwise harmless. Occasionally, mild pressure of the probe during the examination can be uncomfortable, if the body area being examined is tender.
An Ultrasound Scan may be requested by your doctor in any situation where medical imaging is required. Ultrasound is a particularly appropriate imaging test in certain conditions and situations, for example in pregnancy, to diagnose deep venous thrombosis (DVT or blood clots) in the legs, and to confirm or exclude gallstones.
Scan results are usually specific to the body area being examined, and try to answer a clinical question asked by the referring doctor. In general, a NEGATIVE scan is good news which means that the scan is normal. An Ultrasound Scan may be POSITIVE for a specific condition, for example, gallstones, which means that an abnormality or disease has been identified.
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