Ultrasonic or ultrasound relates to energy waves of high frequencies above 30,000 Hz similar to those of audible sound.

The ultrasonic power is the total amount of sound energy emitted by the transducer per unit of time.

See also Ultrasonic Heating.

Due to the absorption of ultrasound, heating of tissue (including bone) can occur. For this reason, the sonographer should follow the ALARA principle to minimize the potential for ultrasonic heating of tissue during for example M-mode ultrasound. The thermal effect of Doppler ultrasound flow examinations is significantly greater.

See also Thermal Index and Ultrasonic Power.

(UCA / USCA) Ultrasonic contrast agents, also called ultrasound contrast agents, are encapsulated bubbles on the order of 1-10 μm in diameter. These gas bubbles are injected into the blood stream in order to increase blood/ tissue contrast during an ultrasonogram. These microbubbles are filled with air or a gas with a lower solubility in blood than air, such as perfluorochemicals. The microbubble shell consists of albumin, phospholipid, or other material and encapsulates the gas core. Due to this construction, ultrasonic contrast agents are highly compressible, and have a high echogenicity.

See also Ultrasound Contrast Agent Safety.

'China based Shantou Institute of Ultrasonic Instruments (SIUI) has been engaged in the development and manufacture of medical ultrasonic diagnosis scanners, industrial ultrasonic detectors and ultrasonic transducers since the early 1960's. Starting as a small scientific research institute, SIUI has developed into a key high-tech corporation at the national level, and is the leading manufacturer of ultrasonic instruments in China.'
'SIUI is dedicated to providing all customers with the ultrasonic scanners of high quality and reasonable price. The annual production amounts to 5,000 ultrasonic scanners and 10,000 transducers. SIUI takes the lead in attaining ISO9001 certification, FDA clearance and CE marking in China. Due to the high ratio of performance to price as well as the guarantee on quality, the products are exported to over 80 countries and areas around the world. The export volume ranks No. 1 in this field in China. The market share continues to improve.'

Ultrasound Systems: