Physics - Ultrasound

Jun 17th, 2015
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Ultrasound is the name given to sound waves that have frequencies greater than 20000Hz. It's too high pitched for human hearing, but many animals, such as dogs, cats and bats can hear ultrasound.Ultrasound has many applications in medicine These include: • Checking the condition of a foetus • Investigating liver problems

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PhysicsUltrasound is the name given to sound waves that have frequencies greater than20000Hz. It's too high pitched for human hearing, but many animals, such as dogs, cats and bats can hear ultrasound.Ultrasound has manyapplicationsin medicine. These include:Checking the condition of a foetusInvestigating liver problemsInvestigating heart problemsBreaking down kidney stones and stones elsewhere in the bodyMeasuring the speed of blood flow in the bodyMedical images from ultrasoundThe ultrasound is sent into the patients body. At eachboundarybetween different tissues or organs some of the ultrasound isreflected.The depth of each layer is calculated using the time taken for each reflected wave to return. The reflected waves (echoes) are usually processed to produce a picture of the inside of the body on a screen.Higher tier onlyThe ultrasound waves used to image babies and soft tissue organs havesmall amplitudeso arelow energy. This makes it safer for the patient, as nodamageis done to any living cells.The alternative isX-rayswhich are high energy electromagnetic waves and which have enough energy to damage or kill human cells.Breaking down kidney stones and stones elsewhere in the bodyA high powered ultrasound wave is used tobreak downkidney stones and other stones in the body. The stonesvibrateuntil they shake themselves apart and are then easily passed out of the body via the urethra.If the ultrasound waves reflect off a mo

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