PPT-3 Waves – Part D3 Ultrasound

Extension Only iGCSE Edexcel 19 Mr Powell 1 Forces and Motion 2 Electricity 3 Waves 4 Energy 5 Solid Liquids Gases 6 Magnetism 7 Radioactivity 8 Astrophysics Lesson 3 Exploring Ultrasound. 1 brPage 10br Layer mm 1 205 010 300 3 137 022 229 5 124 041 206 7 124 030 206 9 124 041 206 11 124 052 206 13 124 063 206 15 124 074 206 Fig 2 brPage 11br Fig 3 Fig 4 50 100 150 200 250 300 002 004 006 008 01 012 014 016 018 Xmm Pau Cloak Object Fr . How is sound produced, how does it travel through the air and how do we hear sounds?. Sound II. As the vocal chords vibrate, the air is alternately compressed and rarefied resulting in a longitudinal pressure wave. Krystal . Kerney. Kyle Fontaine. Ryan O’Flaherty. Basics of Ultrasound. Ultrasound is sound with frequencies higher than about 20 kHz. For medical ultrasound, systems operate at much higher frequencies, typically 1 – 10 MHz. Science (from Latin . scientia. , meaning "knowledge") is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. . . In an older and closely related meaning (found, for example, in Aristotle), "science" refers to the body of reliable knowledge itself, of the type that can be logically and rationally explained. Kerney. Kyle Fontaine. Ryan O’Flaherty. Basics of Ultrasound. Ultrasound is sound with frequencies higher than about 20 kHz. For medical ultrasound, systems operate at much higher frequencies, typically 1 – 10 MHz. Learning Objectives. To recognize the indications for and clinical utility of H&N ultrasound.. To identify normal H&N anatomy. To know basic ultrasound machine capabilities and control functions. sound.  pulses are produced by a transmitter and directed into the body. As in sonar, reflections occur. They occur each time a pulse encounters a boundary between two tissues that have different densities or a boundary between a tissue and the adjacent . A wave is a vibration. That travels from place to place. Thus it is two motions each with its own direction. The . Vibration. : a SHM. The . Propagation. ; its motion from place to place. Together they from a wave. ( 14 weeks Gestation) WHAT IS ULTRASOUND? Medical Ultrasound is a diagnostic imaging technique that uses sound waves to visualize soft tissue structures and vessels. Since it uses sound waves and no Sound. The word ". sound. " may be . defined. in . two ways . (. objectively. and . subjectively. ).. . Objectively. , the . sound. is a . type of wave-motion taking place in a material medium. Dentistry in the modern era is emerging with the use of advanced imaging techniques such as computed tomography(CT), Magnetic Resonance Imaging (MRI), Nuclear Medicine (NM), and Ultrasound (US), of which MRI and Ultrasound are the only imaging techniques, which operate without causing radiation hazards to the patient. . Why Ultrasound?. Over half a century old technique! . Arguably the most widely used imaging technologies in medicine. . Portable, free of radiation risk, and relatively inexpensive compared to MRI, CT and PET. Learning Outcome. 3/4. To understand how ultrasound is used in medicine and industry.. 5/6. Compare ultrasound and audible sound waves in terms of frequency.. 7/8. Describe the operation of an ultrasound transducer in terms of partial reflection.. Mustaqbal. University College. 3. rd. . Properties of Ultrasound . Assistant lecturer: . AnsamFadil. . Ali . Showard. 2. . Properties of Ultrasound. Sound . is a pressure disturbance (vibration) transmitted through all forms of matter: gases, .