Change:  UltrasoundKhurshid is sound with frequency greater than 20,000 cycles per second or 20kHz. Audible sound sensed by the human ear are in the range of 20Hz to 20kHz. Advantages Ultrasound can be directed as a beam. Ultrasound obeys the laws of reflection and refraction. Ultrasound is   View changes from previous version. (Word count: 2398)

Change: Ultrasound:Ultrasound Ultrasound is sound with frequency greater than 20,000 cycles per second or 20kHz. Audible sound sensed by the human ear are in the range of 20Hz to 20kHz. Advantages:Advantages Ultrasound can be directed as a beam. Ultrasound obeys the laws of reflection and refraction. Ultrasound   View changes from previous version. (Word count: 1529)

Change: when used by appropriatly trained professionals for medical indicationsCreating an ultrasound image is done in three steps - producing a sound wave, receiving echoes, and interpreting those echoes. Producing a sound wave Ultrasound waves are produced by a transducer. A transducer   View changes from previous version. (Word count: 1535)

Change: ound is produced using Piezoelectricity which is the ability of some materials (notably crystals and certain ceramics) to generate an electric charge in response to applied mechanical stress, the reverse applies when The word is derived from the piezoelectric effect is reversible in that materials exhibiting the direct piezoelectric effect   View changes from previous version. (Word count: 1526)

Change: US scans have been used to image the human body for at least 50 years and is currently one of the most important, widely used, and versatile imaging modalities in medicine. US images are tomographic and are acquired at "real-time" rates. The technology is relatively inexpensive   View changes from previous version. (Word count: 1436)

Change: The realtime ultrasound picture that appears on the screen is influenced by numerous components such as attenuation, dispersal and refraction of the ultrasound beams (both   View changes from previous version. (Word count: 1278)

Change: The scanner-to-interface-distance is represented on the monitor by the distance of the brightness and modulated spots away from the screen`s upper margin. ie The further   View changes from previous version. (Word count: 1407)

Change: Reflected parts of the beam can be received and measured according to their strength and to the time interval between emission and reception, thus giving   View changes from previous version. (Word count: 1484)

Change: High ultrasound-frequencies (>7.5. Mhz) give a high resolution, although penetration depth is limited - and vice versa. Lower frequencies (< 3 Mhz) render limited resolution but with a deep penetration. A suitable compromise for abdominal work is to use routine probes with frequencies of 3.5 - 5.0 Mhz. Creating   View changes from previous version. (Word count: 1561)

Change: The sound waves are emitted from the crystal similar to sound waves being emitted from a loud speaker. The frequencies emitted are in the range   View changes from previous version. (Word count: 1441)