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Ultrasound equipment can be considered in two parts: the transducer, which sends the ultrasound waves out and receives the returning echoes; and the computer which analyses the data, orders the ultrasound waves emission/reception sequence, allows modifications and displays the information as an image. Ultrasound waves are produced by crystals with piezoelectric properties. These crystals vibrate when subjected to an electrical voltage. The vibration amplitude of the crystals, and therefore of the emitted ultrasound waves, is dependent on the natural resonance of the crystals. The drystals are made of natural quartz or a synthetic ceramic, and are located inside the ultrasound transducer. This chapter considers the Basic physics of ultrasound waves; Ultrasound equipment; Ultrasound image; Doppler ultrasonography; and Abdominal examination.
Abdominal ultrasonography, Page 1 of 1
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